Variability of High-Latitude Vertical Plasma Flux using DMSP Measurements

Details Variability of High-Latitude Vertical Plasma Flux using DMSP Measurements Variability of High-Latitude Vertical Plasma Flux using DMSP Measurements

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufmsa21b0067c&link_type=abstract

American Geophysical Union, Fall Meeting 2003, abstract #SA21B-0067

Physics

2407 Auroral Ionosphere (2704), 2431 Ionosphere/Magnetosphere Interactions (2736), 2475 Polar Cap Ionosphere, 2481 Topside Ionosphere

Scientific paper

We have examined characteristics of the vertical ion flux in the topside high-latitude ionosphere from measurements of the vertical ion drift and ion number density made by the DMSP F13 satellite. In the polar cap the vertical ion flux is uniformly downward at all locations. However, in the auroral zone the ion flux is highly structured and a net upward flux is produced only by spatially and temporally confined events containing upward fluxes in excess of 109 cm-2s-1 that have no downward counterparts. The distribution of the plasma's vertical flux varies by both season and solar cycle with wider variability occurring during winter and at lower levels of solar activity. We also look at variations of the upward flux events as a function of geomagnetic activity.

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