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| Titel |
Features of highly structured equatorial plasma irregularities deduced from CHAMP observations |
| VerfasserIn |
C. Xiong, H. Lühr, S. Y. Ma, C. Stolle, B. G. Fejer |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 30, no. 8 ; Nr. 30, no. 8 (2012-08-24), S.1259-1269 |
| Datensatznummer |
250017259
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| Publikation (Nr.) |
 copernicus.org/angeo-30-1259-2012.pdf |
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| Zusammenfassung |
| In this study five years of CHAMP (Challenging Mini-satellite Payload)
fluxgate magnetometer (FGM) data is used to investigate the characteristics
of Equatorial Plasma Bubbles (EPBs). We filtered the FGM data by using
band-passes with four different cut-off periods to get the EPBs with
different maximum spatial scale sizes in the meridional plane ranging from
76–608 km. Associated with the EPB observations at about 400 km, the typical
altitude of CHAMP during the year 2000–2005, we also investigate the
post-sunset equatorial vertical plasma drift data from ROCSAT-1 (Republic of
China Satellite 1). Since the height of the F-layer is highly correlated
with the vertical plasma drift and solar flux, we sorted the ROCSAT-1 data
into different groups by F10.7. From the integrated vertical drift we have
estimated the post-sunset uplift of the ionosphere. By comparing the
properties of EPB occurrence for different scale sizes with the global
distribution of plasma vertical uplift, we have found that EPBs reaching
higher altitudes are more structured than those which are sampled by CHAMP
near the top side of the depleted fluxtube. Such a result is in accord with
3-D model simulations (Aveiro and Hysell, 2010). Small-scale EPB structures
are observed by CHAMP when the irregularities reach apex heights of 800 km
and more. Such events are encountered primarily in the Brazilian sector
during the months around November, when the post-sunset vertical plasma
drift is high. |
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