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Abstract
Thermospheric neutral density derived from the GRACE A satellite and normalized at altitude of 490 km (ρ) are used to investigate the ρ behavior during the period of recurrent geomagnetic activity (25 January - 5 May, 2005) caused by solar wind high-speed streams (HSSs). The north and south hemispheric ρ values divided in three latitudinal bins are analyzed separately at dayside and nightside. The variations, not caused by solar/geomagnetic activity, are investigated accounting for the relationship between solar flux index, illumination, latitude and DOY for particular magnetic local times (MLTs). Analysis has shown that: ρ increases/decreases from high to low latitudes at dayside/nightside; ρ increases from high to low latitudes at dayside caused by solar EUV radiation is most prominent around MLT = 14 and decrease rapidly with departure from this MLT; the difference between north and south hemispheric ρ values are not the same prior and after the equinox; quiet time ρ differs among latitudinal bins; ρ contains a clear imprint of solar/geomagnetic activity. The cross-correlation analysis reveals a high degree of correlation between ρ and different employed ρ indicators. Time lags based on all ρ indicators suggest that ρ disturbance: occurs about 4 h earlier at high than at lower latitudes and propagates presumably without losses toward equatorial region both at dayside and nightside; propagates faster between polar and mid latitudes at dayside and between mid and low latitudes at nightside. This study provides the most probable characteristics of the ρ variations during the periods in which magnetospheric-thermospheric system is affected primarily by HSSs.
Originalsprache | englisch |
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Seiten (von - bis) | 4335-4350 |
Seitenumfang | 16 |
Fachzeitschrift | Advances in Space Research |
Jahrgang | 69 |
Ausgabenummer | 12 |
DOIs | |
Publikationsstatus | Veröffentlicht - 15 Juni 2022 |
ASJC Scopus subject areas
- Astronomie und Astrophysik
- Luft- und Raumfahrttechnik
- Geophysik
- Allgemeine Erdkunde und Planetologie
- Astronomie und Planetologie
- Atmosphärenwissenschaften
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SWEETS - Vorhersage von Weltraumwettereffekten auf erdnahen, umlaufenden Satelliten
1/07/20 → 30/06/22
Projekt: Forschungsprojekt