Momentum Source Signatures in Thermospheric Neutral Composition
Document ID: 48
Trinks, H.1
Mayr, H. G.2
Philbrick, C. Russell3
1 University of Wuppertal, Wuppertal, F.R.G.
2 NASA Goddard Space Flight Center, Laboratory for Planetary Atmospheres, Greenbelt, MD, U.S.A.
3 USAF, Geophysics Laboratory, Hanscom AFB, Bedford, MA, U.S.A.
Abstract
Perturbations in the structure of the neutral atmosphere were measured in narrow latitude bands near the dayside polar cusp by mass spectrometers aboard the S3-I and Esro 4 satellites. The disturbances are characterized by an in-phase variation of both the lighter and the heavier species. They are observed to occur in latitude bands or about 5° - 10° extent in the altitude region of 200 km during periods of increased geomagnetic activity. It is suggested that thermospheric winds driven by momentum sources associated with ion convection are the predominant cause for these disturbances. The narrow structure features associated with the momentum source are superimposed on the thermospheric changes caused by Joule heating. Both effects may be present simultaneously, resulting in a complex response pattern of the neutral gas composition in the thermosphere.
| Citation: | "Momentum Source Signatures in Thermospheric Neutral Composition", Trinks, H., H. G. Mayr, C. R. Philbrick, Journal of Geophysical Research, Vol. 83. No. A4, American Geophysical Union (AGU), 1978, pp. 1641 - 1643 |