NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Collections About News Help Login
Back to Results
Note on the semi-annual effect in the thermosphereThe semi-annual variation in the thermospheric density is discussed in terms of the spatial and temporal variations in the solar heat input. Two heat sources are considered: the solar heat input associated with the semi-annual migration of the sun, and the auroral heat associated with the semi-annual component in magnetic storms. It is shown that the relatively large global component in the semi-annual effect of the total mass density can be explained by the lack of advective loss which otherwise damps the latitude dependent components in the annual and semi-annual variations, and the significant latitude dependence in the semi-annual variations of composition and temperature can be tied to the diffusion process which is induced by the thermospheric circulation.
Document ID
19730002619
Acquisition Source
Legacy CDMS
Document Type
Preprint (Draft being sent to journal)
Authors
Volland, H. (Bonn Univ. Greenbelt, MD, United States)
Mayr, H. G. (NASA Goddard Space Flight Center)
Date Acquired
September 2, 2013
Publication Date
November 1, 1972
Subject Category
Geophysics
Report/Patent Number
NASA-TM-X-66100
X-621-72-416
Accession Number
73N11346
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

Related Records

There are no records associated with this record.
No Preview Available