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| Titel |
Hemispheric asymmetry of the electron temperature distribution in the topside ionosphere |
| VerfasserIn |
E. Słomińska, H. Rothkaehl |
| Konferenz |
EGU General Assembly 2012
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 14 (2012) |
| Datensatznummer |
250065634
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| Zusammenfassung |
| Six-years dataset of in-situ registrations made by the ISL Probe on board the DEMETER
satellite revealed strong hemispheric asymmetry in the electron temperature distribution.
Obtained results indicate the Southern Hemisphere being "warmer" than the Northern
Hemisphere. The feature is strongly manifested in the daytime ionosphere and persists during
the whole mission. Dayside registrations for the electron temperature reveal remarkable
hemispheric asymmetry at middle (20 - 45° ) and high latitudes ( >45°) manifested by
significantly greater temperatures in the Southern Hemisphere. Observed feature does not
posses the solar zenith angle dependence, and estimated excess reaches 1000 K. In the
Northern Hemisphere the electron temperature maximum is reached in July and does not
exceed the value of 4500 K, while in the Southern Hemisphere the maximum surpasses 5000
K.
The questions addressed in presented work are as follows:
Is the similar feature observed in registrations of the ion temperature, measured
by the IAP instrument on board the same satellite?
Is there a correlation between temperature asymmetry and ionospheric plasma
density distribution?
Is there any correlation between the magnitude of observed asymmetry and
changes in geomagnetic conditions and solar activity?
In order to asses stated goals, data registered on board the DEMETER satellite by two
instruments: IAP and ISL, are examined. |
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