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| Titel |
Joule heating rate at high latitudes |
| VerfasserIn |
A. Aikio, A. Seppälä |
| Konferenz |
EGU General Assembly 2009
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 11 (2009) |
| Datensatznummer |
250027508
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| Zusammenfassung |
| The solar wind energy penetrating the Earth’s magnetopause goes to ring current particles,
plasmoids (eventually ejected away from the magnetosphere), plasma sheet heating,
precipitating particles, and to Joule heating of the polar ionospheres. The role of Joule heating
rate in the global energy budget has been estimated even as 50–60%. This study shows
statistical properties of the Joule heating rate, electric fields and conductances in the high
latitude ionosphere. The results are based on a unique one-month measurement made by the
EISCAT incoherent scatter radar in Tromsø (66.6 cgmlat) from 6 March to 6 April, 2006. The
data are from the same season (close to vernal equinox) and from similar sunspot
conditions (about 1.5 years before the sunspot minimum) providing an excellent set
of data to study the MLT and Kp dependence of parameters with high temporal
and spatial resolution. An important outcome of the study are the fitted functions
for the Joule heating rate as a function of electric field magnitude, separately for
four MLT sectors and two activity (Kp |
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