Physics
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsm32a..01m&link_type=abstract
American Geophysical Union, Fall Meeting 2007, abstract #SM32A-01
Physics
2730 Magnetosphere: Inner, 2736 Magnetosphere/Ionosphere Interactions (2431), 2752 Mhd Waves And Instabilities (2149, 6050, 7836), 2768 Plasmasphere
Scientific paper
Due to the tilt of the geomagnetic field, there is a longitude-dependent asymmetry in ionospheric solar illumination at conjugate points in winter and summer months. This difference is greatest at American longitudes, where, for example, the L=2.5 field line with footprint in Antarctica near 65° geographic latitude and 300° longitude, has its conjugate point at 42° geographic latitude in the northern hemisphere. Previous VLF whistler-based and CRRES spacecraft observations have shown that plasmaspheric electron density is larger by a factor of 2.7 (at solar maximum) in December than in June at L=3.0 at American longitudes. There is a corresponding minimum in electron density at American longitudes in June. Using ground magnetometer data, we determined seasonal average ion mass densities in the equatorial plane at L=2.5 for a range of longitudes. These were compared with the annual variation in electron density and in IMAGE EUV He+ densities. This provides new insight on the seasonal/longitudinal variation in mass density, and also furnishes an estimate of the seasonal variation in plasmaspheric mass loading.
Clilverd Mark A.
Grew Russell S.
Menk Frederick W.
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