investigation of energy transport and thermospheric upwelling during quiet magnetospheric and ionospheric conditions from the studies of low- and middle-altitude cusp
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ID: 177179
2015
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Abstract
We investigate energy fluxes and small, kilometre-scale Birkeland currents in
the magnetospheric cusp at a 1–3 Earth radii altitude and in the ionosphere
using satellites when they were, according to the Tsyganenko model, in
magnetic conjunction within 50–60 km and up to 15 min apart. We
use Cluster and CHAMP satellites, and study three conjunction events that
occurred in 2008 and 2009, when the Cluster spacecraft were crossing the
cusps at only a few Earth radii altitude. Our goal is to understand better
the influence of processes in the magnetospheric cusp on the upper
thermosphere and its upwelling which was usually observed by the CHAMP
satellite passing the cusp. Three studied events occurred under relatively
quiet and steady magnetospheric and ionospheric conditions, which explains
why observed thermospheric density enhancements were rather low. Our findings
point out that for each studied event soft electron precipitation influences
thermospheric density enhancements in a way that stronger electron
precipitation produces stronger thermospheric upwelling. Therefore, in the case
of these weak events, soft electron precipitation seems to be more important
cause of the observed, thermospheric density enhancements than is the Joule
heating.
| Reference Key |
ivkovi2015annalesinvestigation
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|---|---|
| Authors | ;T. Živković;T. Živković;S. Buchert;P. Ritter;L. Palin;H. Opgenoorth |
| Journal | journal of food measurement and characterization |
| Year | 2015 |
| DOI |
10.5194/angeo-33-623-2015
|
| URL | |
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