Physics
Scientific paper
Dec 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufmsa43a1063c&link_type=abstract
American Geophysical Union, Fall Meeting 2004, abstract #SA43A-1063
Physics
2431 Ionosphere/Magnetosphere Interactions (2736), 2435 Ionospheric Disturbances, 2481 Topside Ionosphere, 2736 Magnetosphere/Ionosphere Interactions
Scientific paper
We have examined characteristics of the vertical ion flux of thermal O+ in the topside high-latitude ionosphere before and during a number of geomagnetic storms, including the October and November, 2003 events, using measurements of the vertical ion drift and ion number density made by the DMSP F13 and F15 spacecraft. Prior to storm onset typical upward fluxes of approximately 108-109 cm-2s-1 are observed in the auroral zones with somewhat smaller downward fluxes in the polar caps. Immediately following storm onset upward fluxes reach and sometimes exceed 1010 cm-2s-1 and are observed with vertical velocities of 500--1500 m s-1. At the same time downward fluxes at the higher latitudes reach unusually high values of 109 cm-2s-1. Separately integrating the upwards and downwards fluxes over the high-latitude region (auroral zone and polar cap) for each spacecraft pass allows the observation of total upflow/downflow during the progression of a geomagnetic storm. A superposed epoch analysis of events from 1998 to 2004 reveals a pattern of sudden onset of upwards flux (averaging approximately 14 hours) with a gradually increasing and more extended period of downward flux (lasting about 24 hours). The upwards fluxes are stronger when the coincident fluctuations in the z-component of the IMF are larger.
Coley William R.
Heelis Roderick A.
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