Chromosphere; Corona; Coronagraph; Interferometry; Photosphere; Solar atmosphere; Solar physics mission; Ultra-high resolution; Astronomy and Astrophysics; Space and Planetary Science
Abstract :
[en] Recent solar physics missions have shown the definite role of waves and magnetic fields deep in the inner corona, at the chromosphere-corona interface, where dramatic and physically dominant changes occur. HiRISE (High Resolution Imaging and Spectroscopy Explorer), the ambitious new generation ultra-high resolution, interferometric, and coronagraphic, solar physics mission, proposed in response to the ESA Voyage 2050 Call, would address these issues and provide the best-ever and most complete solar observatory, capable of ultra-high spatial, spectral, and temporal resolution observations of the solar atmosphere, from the photosphere to the corona, and of new insights of the solar interior from the core to the photosphere. HiRISE, at the L1 Lagrangian point, would provide meter class FUV imaging and spectro-imaging, EUV and XUV imaging and spectroscopy, magnetic fields measurements, and ambitious and comprehensive coronagraphy by a remote external occulter (two satellites formation flying 375 m apart, with a coronagraph on a chaser satellite). This major and state-of-the-art payload would allow us to characterize temperatures, densities, and velocities in the solar upper chromosphere, transition zone, and inner corona with, in particular, 2D very high resolution multi-spectral imaging-spectroscopy, and, direct coronal magnetic field measurement, thus providing a unique set of tools to understand the structure and onset of coronal heating. HiRISE’s objectives are natural complements to the Parker Solar Probe and Solar Orbiter-type missions. We present the science case for HiRISE which will address: i) the fine structure of the chromosphere-corona interface by 2D spectroscopy in FUV at very high resolution; ii) coronal heating roots in the inner corona by ambitious externally-occulted coronagraphy; iii) resolved and global helioseismology thanks to continuity and stability of observing at the L1 Lagrange point; and iv) solar variability and space climate with, in addition, a global comprehensive view of UV variability.
Disciplines :
Aerospace & aeronautics engineering
Author, co-author :
Erdélyi, Robertus ; School of Mathematics and Statistics, Solar Physics and Space Plasma Research Centre, University of Sheffield, Sheffield, United Kingdom ; Eötvös University, Budapest, Hungary ; Hungarian Solar Physics Foundation, Gyula, Hungary
Damé, Luc; Laboratoire Atmosphères, Milieux, Observations Spatiales (LATMOS), Guyancourt, France
Fludra, Andrzej; STFC Rutherford Appleton Laboratory, Chilton, Didcot, United Kingdom
Mathioudakis, Mihalis; Astrophysics Research Centre, Queen’s University, Belfast, United Kingdom
Amari, T.; CPHT, Ecole Polytechnique, Palaiseau, France
Belucz, B.; School of Mathematics and Statistics, Solar Physics and Space Plasma Research Centre, University of Sheffield, Sheffield, United Kingdom ; Eötvös University, Budapest, Hungary
Berrilli, F.; University of Tor Vergata, Roma, Italy
Bogachev, S.; Lebedev Physics Institute, Moscow, Russian Federation
Bolsée, D.; BIRA-IASB, Brussels, Belgium
Bothmer, V.; University of Göttingen, Göttingen, Germany
Brun, S.; Service d’Astrophysique, CEA Saclay, Saclay, France
Dewitte, S.; Royal Meteorological Inst. of Belgium, Brussels, Belgium
de Wit, T. Dudok; LPC2E, CNRS/University of Orléans/CNES, Orléans, France
Faurobert, M.; IRAP, Université de Nice, Toulouse, France
Gizon, L.; Max-Planck-Institut für Sonnensystemforschung, Göttingen, Germany
Gyenge, N.; School of Mathematics and Statistics, Solar Physics and Space Plasma Research Centre, University of Sheffield, Sheffield, United Kingdom ; Hungarian Solar Physics Foundation, Gyula, Hungary
Korsós, M.B.; Eötvös University, Budapest, Hungary ; Hungarian Solar Physics Foundation, Gyula, Hungary ; Aberystwyth University, Wales, United Kingdom
Labrosse, N.; School of Physics and Astronomy, University of Glasgow, Glasgow, Scotland, United Kingdom
Matthews, S.; Mullard Space Science Lab., UCL, Surrey, United Kingdom
Meftah, M.; Laboratoire Atmosphères, Milieux, Observations Spatiales (LATMOS), Guyancourt, France
Morgan, H.; Aberystwyth University, Wales, United Kingdom
Pallé, P.; Instituto de Astrofisica de Canarias (IAC), Tenerife, Spain
Rochus, Pierre ; Université de Liège - ULiège > Département d'aérospatiale et mécanique ; Centre Spatial de Liège, Liège, Belgium
Rozanov, E.; PMOD/WRC, Davos, Switzerland
Schmieder, B.; Observatory Paris-Meudon, Meudon, France
Tsinganos, K.; University of Athens, Athens, Greece
Verwichte, E.; University of Warwick, Coventry, United Kingdom
Zharkov, S.; University of Hull, Hull, United Kingdom
Zuccarello, F.; Dipartimento di Fisica e Astronomia, University of Catania, Catania, Italy
Wimmer-Schweingruber, R.; CAU, University of Kiel, Kiel, Germany
The authors would like to thank the anonymous referee for the very careful reading of the paper and for suggesting structural changes for a more fluent read. Sources of funding acknowledged are: R.E. acknowledges the support received from the Science and Technology Facilities Council (STFC) UK (grant number ST/M000826/1 at the University of Sheffield). L.D. is grateful to the Centre National d’Etudes Spatiales (CNES) for R&T support received to develop SOLARNET interferometric breadboard and new generation of FUV robust solar telescopes (SUAVE). M.B.K and HM are grateful to the Science and Technology Facilities Council (STFC), (UK, Aberystwyth University, grant number ST/S000518/1). F.Z. acknowledges the support received by the Universitá degli Studi di Catania (Piano per la Ricerca Universitá di Catania 2016-2018 - Linea di intervento 2) and by the Italian MIUR-PRIN grant 2017APKP7T on Circumterrestrial Environment: Impact of Sun-Earth Interaction.
Amari, T., Canou, A., Aly, J.J.: Characterizing and predicting the magnetic environment leading to solar eruptions. Nature 514(7523), 465–469 (2014). 10.1038/nature13815 DOI: 10.1038/nature13815
Antia, H.M.: Does the sun shrink with increasing magnetic activity? Astrophys. J. 590(1), 567–572 (2003). 10.1086/374916 DOI: 10.1086/374916
Antonucci, E., Kohl, J.L., Noci, G., Tondello, G., Huber, M.C.E., Gardner, L.D., Nicolosi, P., Giordano, S., Spadaro, D., Ciaravella, A., Raymond, C.J., Naletto, G., Fineschi, S., Romoli, M., Siegmund, O.H.W., Benna, C., Michels, J., Modigliani, A., Panasyuk, A., Pernechele, C., Smith, P.L., Strachan, L., Ventura, R.: Velocity fields in the solar corona during mass ejections as observed with UVCS-SOHO. Astrophys. J. Lett. 490(2), L183–L186 (1997). 10.1086/311028 DOI: 10.1086/311028
Appourchaux, T., Sekii, T., Gough, D., Lee, U., Wehrli, C., Virgo Team: Structure inversions with the VIRGO data. In: Provost, J., Schmider, F.X. (eds) Sounding Solar and Stellar Interiors, IAU Symposium, vol. 181, p. ISBN0792348389 (1997)
Axford, W.I., McKenzie, J.F.: The solar wind. In: Cosmic Winds and the Heliosphere, p. 31 (1997)
Baker, D., van Driel-Gesztelyi, L., Mandrini, C.H., Démoulin, P., Murray, M.J.: Magnetic reconnection along quasi-separatrix layers as a driver of ubiquitous active region outflows. Astrophys. J. 705(1), 926–935 (2009). 10.1088/0004-637X/705/1/926 DOI: 10.1088/0004-637X/705/1/926
Banerjee, D., Erdélyi, R., Oliver, R., O’Shea, E.: Present and future observing trends in atmospheric magnetoseismology. Solar Phys. 246(1), 3–29 (2007). 10.1007/s11207-007-9029-z DOI: 10.1007/s11207-007-9029-z
Brooks, D.H., Warren, H.P.: Establishing a connection between active region outflows and the solar wind: abundance measurements with EIS/Hinode. Astrophys. J. Lett. 727(1), L13 (2011). 10.1088/2041-8205/727/1/L13 DOI: 10.1088/2041-8205/727/1/L13
Bryans, P., Young, P.R., Doschek, G.A.: Multiple component outflows in an active region observed with the EUV imaging spectrometer on hinode. Astrophys. J. 715(2), 1012–1020 (2010). 10.1088/0004-637X/715/2/1012 DOI: 10.1088/0004-637X/715/2/1012
Cranmer, S.R.: Self-consistent models of the solar wind. Space Sci. Rev. 172(1–4), 145–156 (2012). 10.1007/s11214-010-9674-7 DOI: 10.1007/s11214-010-9674-7
Damé, L.: A very high resolution vision for solar physics: Interferometry & spectral-imaging in the far ultraviolet. In: SOHO-17. 10 Years of SOHO and Beyond, vol. 617, p. 35. ESA Special Publication (2006)
Damé, L.: Future solar space missions to observe the sun from the chromosphere to the corona and beyond. In: Damé, L., Hady, A. (eds.) International Association of Geomagnetism and Aeronomy (IAGA) 2nd Symposium: Solar Wind - Space Environment Interaction. Cairo University Press (2010a) https://doi.org/10.1012/S120027852002
Damé, L.: The solar diameter is most probably constant over the solar cycle. In: 38th COSPAR Scientific Assembly, vol. 38, p. 2 (2010b)
Damé, L.: The space weather and ultraviolet solar variability (SWUSV) microsatellite mission. Journal of Advanced Research 4(3), 235–251 (2013). 10.1016/j.jare.2013.03.002 DOI: 10.1016/j.jare.2013.03.002
Damé, L., Derrien, M.: Solar physics and interferometry mission (SPI). Advances in Space Research 29(12), 2061–2073 (2002). 10.1016/S0273-1177(02)00152-7 DOI: 10.1016/S0273-1177(02)00152-7
Damé, L., Derrien, M., Kozlowski, M., Merdjane, M.: High resolution solar physics by interferometry: SOLARNET. In: Crossroads for European Solar and Heliospheric Physics. Recent Achievements and Future Mission Possibilities, vol. 417, p. 109. ESA Special Publication (1998)
Damé, L., Hersé, M., Thuillier, G., Appourchaux, T., Crommelynck, D., Dewitte, S., Joukoff, A., Fröhlich, C., Laclare, F., Delmas, C., Boumier, P.: PICARD: simultaneous measurements of the solar diameter, differential rotation, solar constant and their variations. Advances in Space Research 24(2), 205–214 (1999). 10.1016/S0273-1177(99)00502-5 DOI: 10.1016/S0273-1177(99)00502-5
Damé, L., Meftah, M., Irbah, A., Hauchecorne, A., Keckhut, P., Quémerais, E.: SUAVE: a UV telescope for space weather and solar variability studies. In: Space Telescopes and Instrumentation 2014: Ultraviolet to Gamma Ray, Society of Photo-Optical Instrumentation Engineers (SPIE) Conference Series, vol. 9144, p. 914431 (2014) https://doi.org/10.1117/12.2057705
De Pontieu, B., Tarbell, T., Erdélyi, R.: Correlations on arcsecond scales between chromospheric and transition region emission in active regions. Astrophys. J. 590(1), 502–518 (2003). 10.1086/374928 DOI: 10.1086/374928
De Pontieu, B., Erdélyi, R., James, S.P.: Solar chromospheric spicules from the leakage of photospheric oscillations and flows. Nature 430(6999), 536–539 (2004). 10.1038/nature02749 DOI: 10.1038/nature02749
De Pontieu, B., McIntosh, S.W., Carlsson, M., Hansteen, V.H., Tarbell, T.D., Schrijver, C.J., Title, A.M., Shine, R.A., Tsuneta, S., Katsukawa, Y., Ichimoto, K., Suematsu, Y., Shimizu, T., Nagata, S.: Chromospheric Alfvénic waves strong enough to power the solar wind. Science 318(5856), 1574 (2007). 10.1126/science.1151747 DOI: 10.1126/science.1151747
De Pontieu, B., Carlsson, M., Rouppe van der Voort, L.H.M., Rutten, R.J., Hansteen, V.H., Watanabe, H.: Ubiquitous torsional motions in Type II spicules. Astrophys. J. Lett. 752(1), L12 (2012). 10.1088/2041-8205/752/1/L12 DOI: 10.1088/2041-8205/752/1/L12
De Pontieu, B., Title, A., Carlsson, M.: Probing the solar interface region. Science 346(6207), 315 (2014). 10.1126/science.346.6207.315 DOI: 10.1126/science.346.6207.315
Erdélyim, R.: Magnetic seismology of the lower solar atmosphere. In: Proceedings of SOHO 18/GONG 2006/HELAS I, Beyond the spherical Sun, vol. 624, p. 15. ESA Special Publication (2006)
Erdélyi, R., Malins, C., Tóth, G., de Pontieu, B.: Leakage of photospheric acoustic waves into non-magnetic solar atmosphere. Astron. Astrophys. 467(3), 1299–1311 (2007). 10.1051/0004-6361:20066857 DOI: 10.1051/0004-6361:20066857
Ermolli, I., Matthes, K., Dudok de Wit, T., Krivova, N.A., Tourpali, K., Weber, M., Unruh, Y.C., Gray, L., Langematz, U., Pilewskie, P., Rozanov, R., Schmutz, W., Shapiro, A., Solanki, S.K.: Recent variability of the solar spectral irradiance and its impact on climate modelling. Atmospheric Chemistry and Physics 12(8), 3945–3977 (2013). 10.5194/acp-13-3945-2013 DOI: 10.5194/acp-13-3945-2013
Fröhlich, C., Finsterle, W., Andersen, B., Appourchaux, T., Chaplin, W.J., Elsworth, Y., Gough, D.O., Hoeksema, J.T., Isaak, G.R., Kosovichev, A.G., Provost, J., Scherrer, P.H., Sekii, T., Toutain, T.: Observational upper limits for low-degree solar g-modes. In: Korzennik, S. (ed.) Structure and Dynamics of the Interior of the Sun and Sun-like Stars, vol. 418, p. 67. ESA Special Publication (1998)
Galano, D., Bemporad, A., Buckley, S., Cernica, I., Dániel, V., Denis, F., de Vos, L., Fineschi, S., Galy, C., Graczyk, R., Horodyska, P., Jacob, J., Jansen, R., Kranitis, N., Kurowski, M., Ladno, M., Ledent, P., Loreggia, D., Melich, R., Mollet, D., Mosdorf, M., Paschalis, A., Peresty, R., Purica, M., Radzik, B., Rataj, M., Rougeot, R., Salvador, L., Thizy, C., Versluys, J., Walczak, T., Zarzycka, A., Zender, J., Zhukov, A.: Development of ASPIICS: a coronagraph based on Proba-3 formation flying mission. In: Lystrup, M., MacEwen, H.A., Fazio, G.G., Batalha, N., Siegler, N., Tong, E.C. (eds.) Space Telescopes and Instrumentation 2018: Optical, Infrared, and Millimeter Wave, Society of Photo-Optical Instrumentation Engineers (SPIE) Conference Series, vol. 10698, p. 106982Y (2018) https://doi.org/10.1117/12.2312493
Harra, L.K., Sakao, T., Mandrini, C.H., Hara, H., Imada, S., Young, P.R., van Driel-Gesztelyi, L., Baker, D.: Outflows at the edges of active regions: contribution to solar wind formation? Astrophys. J. Lett. 676(2), L147 (2008). 10.1086/587485 DOI: 10.1086/587485
Hassler, D.M., Dammasch, I.E., Lemaire, P., Brekke, P., Curdt, W., Mason, H.E., Vial, J.C., Wilhelm, K.: Solar wind outflow and the chromospheric magnetic network. Science 283, 810 (1999). 10.1126/science.283.5403.810 DOI: 10.1126/science.283.5403.810
Jefferies, S.M., McIntosh, S.W., Armstrong, J.D., Bogdan, T.J., Cacciani, A.R., Fleck, B.: Magnetoacoustic portals and the basal heating of the solar chromosphere. Astrophys. J. Lett. 648(2), L151–L155 (2006). 10.1086/508165 DOI: 10.1086/508165
Jess, D.B., Mathioudakis, M., Erdélyi, R., Crockett, P.J., Keenan, F.P., Christian, D.J.: Alfvén waves in the lower solar atmosphere. Science 323(5921), 1582 (2009). 10.1126/science.1168680 DOI: 10.1126/science.1168680
Klimchuk, J.A.: On solving the coronal heating problem. Solar Phys. 234(1), 41–77 (2006). 10.1007/s11207-006-0055-z DOI: 10.1007/s11207-006-0055-z
Klimchuk, J.A., López Fuentes, M.C.: Coronal heating. In: Solomos, N. (ed.) Recent Advances in Astronomy and Astrophysics, American Institute of Physics Conference Series, vol. 848, pp. 55–63 (2006) https://doi.org/10.1063/1.2347961
Kohl, J.L., Noci, G., Antonucci, E., Tondello, G., Huber, M.C.E., Gardner, L.D., Nicolosi, P., Strachan, L., Fineschi, S., Raymond, J.C., Romoli, M., Spadaro, D., Panasyuk, A., Siegmund, O.H.W., Benna, C., Ciaravella, A., Cranmer, S.R., Giordano, S., Karovska, M., Martin, R., Michels, J., Modigliani, A., Naletto, G., Pernechele, C., Poletto, G., Smith, P.L.: First Results from the SOHO Ultraviolet Coronagraph Spectrometer. Solar Phys. 175(2), 613–644 (1997). 10.1023/A:1004903206467 DOI: 10.1023/A:1004903206467
Koutchmy, S., Baudin, F., Bocchialini, K., Daniel, J.Y., Delaboudiniére, J.P., Golub, L., Lamy, P., Adjabshirizadeh, A.: The August 11th, 1999 CME. Astron. Astrophys. 420, 709–718 (2004). 10.1051/0004-6361:20040109 DOI: 10.1051/0004-6361:20040109
Kuhn, J.R., Bogart, R., Bush, R., Sá, L., Scherrer, P., Scheick, X.: Precision solar astrometry from SoHO/MDI. In: Provost, J., Schmider, F.X. (eds.) Sounding Solar and Stellar Interiors, IAU Symposium, vol. 181, p. ISBN0792348389 (1997)
Kuhn, J.R., Bush, R.I., Emilio, M., Scherrer, P.H.: On the constancy of the solar diameter. II. Astrophys. J. 613(2), 1241–1252 (2004). 10.1086/423301 DOI: 10.1086/423301
Lean, J.: The Sun’s variable radiation and its relevance for Earth. Ann. Rev. of Astron. Astrophys. 35, 33–67 (1997). 10.1146/annurev.astro.35.1.33 DOI: 10.1146/annurev.astro.35.1.33
Lin, H., Penn, M.J., Tomczyk, S.: A new precise measurement of the coronal magnetic field strength. Astrophys. J. Lett. 541(2), L83–L86 (2000). 10.1086/312900 DOI: 10.1086/312900
Lin, H., Kuhn, J.R., Coulter, R.: Coronal magnetic field measurements. Astrophys. J. Lett. 613(2), L177–L180 (2004). 10.1086/425217 DOI: 10.1086/425217
Marsch, E.: Cyclotron heating of the solar Corona. Astrophys. Space Sci. 264, 63–76 (1999). 10.1023/A:1002436407996 DOI: 10.1023/A:1002436407996
Mathur, S., Turck-Chièze, S., Couvidat, S., García, R.A.: On the characteristics of the Solar gravity mode frequencies. Astrophys. J. 668(1), 594–602 (2007). 10.1086/521187 DOI: 10.1086/521187
Meftah, M., Bolsée, D., Damé, L., Hauchecorne, A., Pereira, N., Irbah, A., Bekki, S., Cessateur, G., Foujols, T., Thiéblemont, R.: Solar irradiance from 165 to 400 nm in 2008 and UV variations in three spectral bands during solar cycle 24. Solar Phys. 291(12), 3527–3547 (2016). 10.1007/s11207-016-0997-8 DOI: 10.1007/s11207-016-0997-8
Meftah, M., Damé, L., Bolsée, D., Hauchecorne, A., Pereira, N., Sluse, D., Cessateur, G., Irbah, A., Bureau, J., Weber, M., Bramstedt, K., Hilbig, T., Thiéblemont, R., Marchand, M., Lefèvre, F., Sarkissian, A., Bekki, S.: SOLAR-ISS: A new reference spectrum based on SOLAR/SOLSPEC observations. Astron. Astrophys. 611, A1 (2018). 10.1051/0004-6361/201731316 DOI: 10.1051/0004-6361/201731316
Ofman, L.: Wave modeling of the Solar wind. Living Reviews in Solar Physics 7(1), 4 (2010). 10.12942/lrsp-2010-4 DOI: 10.12942/lrsp-2010-4
Patsourakos, S., Vourlidas, A., Török, T., Kliem, B., Antiochos, S.K., Archontis, V., Aulanier, G., Cheng, X., Chintzoglou, G., Georgoulis, M.K., Green, L.M., Leake, J.E., Moore, R., Nindos, A., Syntelis, P., Yardley, S.L., Yurchyshyn, V., Zhang, J.: Decoding the pre-eruptive magnetic field configurations of coronal mass ejections. Space Sci. Rev. 216(8), 131 (2020). 10.1007/s11214-020-00757-9 DOI: 10.1007/s11214-020-00757-9
Peter, H.: Asymmetries of solar coronal extreme ultraviolet emission lines. Astron. Astrophys. 521, A51 (2010). 10.1051/0004-6361/201014433 DOI: 10.1051/0004-6361/201014433
Peter, H., Gudiksen, B.V., Nordlund, A.: Coronal heating through braiding of magnetic field lines synthesized coronal EUV emission and magnetic structure. In: Innes, D.E., Lagg, A., Solanki, S.A. (eds.) Chromospheric and Coronal Magnetic Fields, vol. 596, p. 14.1. ESA Special Publication (2005a)
Peter, H., Gudiksen, B.V., Nordlund, Å.: EUV Emission from a 3D MHD coronal model: Temporal variability in a synthesized Corona. In: Fleck, B., Zurbuchen, T.H., Lacoste, H. (eds.) Solar Wind 11/SOHO 16, Connecting Sun and Heliosphere, vol. 592, p. 527 ESA Special Publication (2005b)
Peter, H., Gudiksen, B.V., Nordlund, Å.: Forward modeling of the Corona of the Sun and Solar-like stars: from a Three-dimensional magnetohydrodynamic model to synthetic extreme-ultraviolet spectra. Astrophys. J. 638(2), 1086–1100 (2006). 10.1086/499117 DOI: 10.1086/499117
Peter, H, Abbo, L, Andretta, V, Auchère, F, Bemporad, A, Berrilli, F, Bommier, V, Braukhane, A, Casini, R, Curdt, W, Davila, J, Dittus, H, Fineschi, S, Fludra, A, Gandorfer, A, Griffin, D, Inhester, B, Lagg, A, Land i Degl’Innocenti, E, Maiwald, V, Sainz, RM, Martínez Pillet, V, Matthews, S, Moses, D, Parenti, S, Pietarila, A, Quantius, D, Raouafi, NE, Raymond, J, Rochus, P, Romberg, O, Schlotterer, M, Schühle, U, Solanki, S, Spadaro, D, Teriaca, L, Tomczyk, S, Trujillo Bueno, J, Vial, JC: Solar magnetism eXplorer (SolmeX). Exploring the magnetic field in the upper atmosphere of our closest star. Experimental Astronomy 33(2-3):271–303 (2012) https://doi.org/10.1007/s10686-011-9271-0
Priest, E.R.: Heating the Solar Corona by magnetic reconnection. Astrophys. Space Sci. 264, 77–100 (1999). 10.1023/A:1002440524834 DOI: 10.1023/A:1002440524834
Priest, E.R.: How is the Solar Corona heated? In: Butler, C.J., Doyle, J.G. (eds.) Solar and stellar activity: similarities and differences, astronomical society of the pacific conference series, vol. 158, p. 321 (1999b)
Raouafi, N.E., Solanki, S.K.: Sensitivity of solar off-limb line profiles to electron density stratification and the velocity distribution anisotropy. Astron. Astrophys. 445(2), 735–745 (2006). 10.1051/0004-6361:20042568 DOI: 10.1051/0004-6361:20042568
Schmelz, J.T., Kimble, J.A., Jenkins, B.S., Worley, B.T., Anderson, D.J., Pathak, S., Saar, S.H.: Atmospheric imaging assembly multithermal loop analysis: first results. Astrophys. J. Lett. 725(1), L34–L37 (2010). 10.1088/2041-8205/725/1/L34 DOI: 10.1088/2041-8205/725/1/L34
Schrijver, C.J., Title, A.M., Hagenaar, H.J., Shine, R.A.: Modeling the distribution of magnetic fluxes in field concentrations in a solar active region. Solar Phys. 175(2), 329–340 (1997). 10.1023/A:1004901916229 DOI: 10.1023/A:1004901916229
Schwenn, R., Marsch, E.: Physics of the inner heliosphere II. Physics and Chemistry in Space 21 (1991) https://doi.org/10.1007/978-3-642-75364-0
Strong, K.T.: YOHKOH Team: Observations of loops and prominences. Space Sci. Rev. 70(1–2), 133–142 (1994). 10.1007/BF00777857 DOI: 10.1007/BF00777857
Taroyan, Y., Erdélyi, R.: Heating diagnostics with MHD waves. Space Sci. Rev. 149(1–4), 229–254 (2009). 10.1007/s11214-009-9506-9 DOI: 10.1007/s11214-009-9506-9
Tomczyk, S., McIntosh, S.W., Keil, S.L., Judge, P.G., Schad, T., Seeley, D.H., Edmondson, J.: Alfvén waves in the Solar Corona. Science 317(5842), 1192 (2007). 10.1126/science.1143304 DOI: 10.1126/science.1143304
Toulmonde, M.: The diameter of the Sun over the past three centuries. Astron. Astrophys. 325, 1174–1178 (1997)
Tu, C.Y., Marsch, E., Wilhelm, K., Curdt, W.: Ion temperatures in a Solar polar coronal hole observed by SUMER on SOHO. Astrophys. J. 503(1), 475–482 (1998). 10.1086/305982 DOI: 10.1086/305982
Turck-Chièze, S., Carton, P.H., Ballot, J., Barrière, J.C., Daniel-Thomas, P., Delbart, A., Desforges, D., Garcia, R.A., Granelli, R., Mathur, S., Nunio, F., Piret, Y., Pallé, P.L., Jiménez, A.J., Jiménez-Reyes, S.J., Robillot, J.M., Fossat, E., Eff-Darwich, A.M., Gelly, B.: GOLF-NG spectrometer, a space prototype for studying the dynamics of the deep solar interior. Advances in Space Research 38(8), 1812–1818 (2006). 10.1016/j.asr.2005.09.033 DOI: 10.1016/j.asr.2005.09.033
Verscharen, D., Wicks, R.T., Branduardi-Raymont, G., Erdélyi, R., Frontera, F., Götz, C., Guidorzi, C., Lebouteiller, V., Matthews, S.A., Nicastro, F., Rae, I.J., Retinò, A., Simionescu, A., Soffitta, P., Uttley, P., Wimmer-Schweingruber, R.F.: The Plasma universe: a coherent science theme for voyage 2050. Frontiers in Astronomy and Space Sciences 8, 30 (2021). 10.3389/fspas.2021.651070 DOI: 10.3389/fspas.2021.651070
Wilhelm, K., Marsch, E., Dwivedi, B.N., Hassler, D.M., Lemaire, P., Gabriel, A.H., Huber, M.C.E.: The Solar Corona above polar coronal holes as seen by SUMER on SOHO. Astrophys. J. 500(2), 1023–1038 (1998). 10.1086/305756 DOI: 10.1086/305756
Winebarger, A.R., Warren, H.P., Falconer, D.A.: Modeling X-ray loops and EUV Moss in an active region core. Astrophys. J. 676(1), 672–679 (2008). 10.1086/527291 DOI: 10.1086/527291
Withbroe, G.L.: The temperature structure, mass, and energy flow in the corona and inner solar wind. Astrophys. J. 325, 442 (1988). 10.1086/166015 DOI: 10.1086/166015
Wittmann, A.D.: Visual and photoelectric measurements of the solar diameter (1972–2002): Methods and results. Astronomische Nachrichten 324(4), 378–380 (2003). 10.1002/asna.200310135 DOI: 10.1002/asna.200310135
Wittmann, A.D., Bianda, M.: Drift-time measurements of the solar diameter 1990-2000: New limits on constancy. In: Wilson, A. (ed.) The Solar Cycle and Terrestrial Climate, Solar and Space weather, vol. 463, p. 113. ESA Special Publication (2000)
Wu, CJ, Usoskin, IG, Krivova, N, Kovaltsov, GA, Baroni, M, Bard, E, Solanki, SK: Solar activity over nine millennia: A consistent multi-proxy reconstruction. Astronomy and Astrophysics in press. arXiv:1804.01302 (2018)
