Physics
Scientific paper
Oct 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009jgra..11410305c&link_type=abstract
Journal of Geophysical Research, Volume 114, Issue A10, CiteID A10305
Physics
Ionosphere: Ionosphere/Magnetosphere Interactions (2736), Ionosphere: Ionospheric Storms (7949), Ionosphere: Ionospheric Dynamics, Ionosphere: Polar Cap Ionosphere, Ionosphere: Auroral Ionosphere (2704)
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-2 s-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-2 s-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-2 s-1. Separately integrating the upward and downward fluxes over the high-latitude region (auroral zone and polar cap) for each spacecraft pass allows the observation of variations in the total upflow/downflow during the progression of a geomagnetic storm. A superposed epoch analysis of events from 1995 to 2004 reveals a pattern of sudden onset of upward flux (averaging approximately 14 hours) with a gradually increasing and more extended period of downward flux (lasting about 24 hours). The upward fluxes are stronger when the coincident fluctuations in the z component of the IMF are larger. Strong upward flux events during storm times tend to occur when the solar wind velocity is elevated and the solar wind density is high. Upward flux events can also occur without a coincident geomagnetic storm if the solar wind velocity is above average.
Coley William R.
Heelis Roderick A.
No associations
LandOfFree
Stormtime measurements of topside ionospheric upflow from Defense Meteorological Satellite Program does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Stormtime measurements of topside ionospheric upflow from Defense Meteorological Satellite Program, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Stormtime measurements of topside ionospheric upflow from Defense Meteorological Satellite Program will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1517464