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| Titel |
IMF By effects in the plasma flow at the polar cap boundary |
| VerfasserIn |
R. Lukianova, A. Kozlovsky |
| 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 ; 29, no. 7 ; Nr. 29, no. 7 (2011-07-22), S.1305-1315 |
| Datensatznummer |
250017065
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| Publikation (Nr.) |
 copernicus.org/angeo-29-1305-2011.pdf |
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| Zusammenfassung |
| We used the dataset obtained from the EISCAT Svalbard Radar during 2000–2008
to study statistically the ionospheric convection in a vicinity of the polar
cap boundary as related to IMF By conditions separately for northward and
southward IMF. The effect of IMF By is manifested in the intensity and
direction of the azimuthal component of ionospheric flow. The most
significant effect is observed on the day and night sides whereas on dawn
and dusk the effect is essentially less prominent. However, there is an
asymmetry with respect to the noon-midnight meridian. On the day side the
intensity of By-related azimuthal flow is maximal exactly at noon, whereas on
the night side the maximum is shifted toward the post-midnight hours (~03:00 MLT).
On the dusk side the relative reduction of the azimuthal flow is
much larger than that on the dawn side. Overall, the magnetospheric response
to IMF By seems to be stronger in the 00:00–12:00 MLT sector compared to the
12:00–24:00 MLTs. Quantitative characteristics of the IMF By effect are presented and
partly explained by the magnetospheric electric fields generated due to the
solar wind and also by the position of open-closed boundary for different
IMF orientation. |
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