NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
High-resolution digital movies of emerging flux and horizontal flows in active regions on the sunHigh-resolution observations of active regions in many wavelength bands obtained at the Vacuum Tower Telescope of NSO/Sunspot (Sacramento Peak) are presented. The SOUP tunable filter, HRSO 1024 x 1024 CCD camera, and a sunspot tracker for image stabilization were used. Subarrays of 512 x 512 pixels were processed digitally and recorded on videodisk in movie format. The movies with 0.5 to 1 arcsecond resolution of the following simultaneous observations were shown: green continuum, longitudinal magnetogram, Doppler velocity, Fe I 5576 A line center, H alpha wings, and H alpha line center. The best set of movies show a 90 x 90 arcsecond field-of-view of an active region at S29, W11. When viewed at speeds of a few thousand times real-time, the photospheric movies clearly show the active region fields being distorted by a remarkable combination of systematic flows and small eruptions of new flux. Flux emergence is most easily discovered in line center movies: an elongated dark feature appears first, followed soon after by bright points at one or both ends. A brief, strong upflow is seen when the dark feature first appears; downflow in the bright points persists much longer. The magnetic flux appears to increase gradually over this extended period. Some of the flux emergence events were studied in detail, with measurements of horizontal and vertical velocities and magnetic flux versus time within one footpoint of the loop.
Document ID
19890006508
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Topka, K.
(Lockheed Missiles and Space Co. Palo Alto, CA, United States)
Ferguson, S.
(Lockheed Missiles and Space Co. Palo Alto, CA, United States)
Frank, Z.
(Lockheed Missiles and Space Co. Palo Alto, CA, United States)
Tarbell, T.
(Lockheed Missiles and Space Co. Palo Alto, CA, United States)
Title, A.
(Lockheed Missiles and Space Co. Palo Alto, CA, United States)
Date Acquired
September 5, 2013
Publication Date
November 1, 1988
Publication Information
Publication: NASA, Goddard Space Flight Center, Max 1991: Flare Research at the Next Solar Maximum. Workshop 1: Scientific Objectives
Subject Category
Solar Physics
Accession Number
89N15879
Funding Number(s)
CONTRACT_GRANT: NAS5-26813
CONTRACT_GRANT: NAS8-32805
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
No Preview Available