Physics
Scientific paper
Dec 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufmsa23a0380i&link_type=abstract
American Geophysical Union, Fall Meeting 2004, abstract #SA23A-0380
Physics
2427 Ionosphere/Atmosphere Interactions (0335), 0310 Airglow And Aurora, 0350 Pressure, Density, And Temperature, 0355 Thermosphere: Composition And Chemistry, 0358 Thermosphere: Energy Deposition
Scientific paper
Solar flare and magnetic storm activity occurring in October and November of 2003 have been the subjects of intense scrutiny for their extreme effects on the upper atmosphere and ionosphere. During these events, complimentary measurements of the upper atmosphere and ionosphere were made using a broad variety of space-based assets. Important to this initial study of the thermospheric disturbance are in-situ measurements of the neutral density near 400 km from the CHAMP and GRACE satellites. These carry sensitive accelerometers which can detect the slight satellite drag force from which the neutral density is then determined. Global images from the Far-Ultraviolet Spectrographic Imager onboard the NASA-IMAGE satellite provide a measure of the disturbance in thermospheric composition at lower altitudes (130-200 km). Observed from high altitudes, variations in atomic oxygen emissions at 135.6 nm closely follow the column integrated ratio of O/N2. In this initial comparison of the two data sets, the correspondence of total density at high altitudes and O/N2 throughout the atmospheric column is examined and compared to expected results from empirical atmospheric models (cf. NRL-MSIS 2000). Departures from hydrostatic equilibrium should certainly be observed during the intense magnetic storm. The origin of any observed effects will be studied in the context of drivers including dynamical redistribution or impulsive auroral heating of the high-latitude thermosphere.
Forbes Jeffrey M.
Frey Harald U.
Immel Thomas J.
Mende Stephen B.
Nerem Steven R.
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