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| Titel |
Influence of a quasi-radial IMF on the magnetopause position |
| VerfasserIn |
G. Granko, J. Safrankova, Z. Nemecek, K. Jelínek, A. Samsonov |
| 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 |
250059740
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| Zusammenfassung |
| The interplanetary magnetic field (IMF) is one of the solar wind parameters which strongly
affects the solar wind – magnetosphere interaction. Due to its significant variability, its
small fluctuations are hardly predictable and this effect makes difficult to accurately
predict some magnetospheric changes. Moreover, even stable solar wind conditions
with some non-typical IMF orientations may result in a surprising magnetospheric
configuration. One of such examples is the case with a nearly radial IMF which can be
observed in the solar wind very occasionally but causes a very specific magnetopause
shape.
We have collected data set of more than 7000 crossings of the subsolar and flank
low-latitude magnetopause observed by five THEMIS spacecraft in course of the 2007–2009
years and analyzed the difference between observed magnetopause radial distances and those
predicted by an empirical magnetopause model. The data propagated from the L1 point as
well as the measurements of the near-Earth solar wind monitors (whenever available) were
used as a model input. We discuss an influence of the quasi-radial IMF on the magnetopause
position and we analyze in detail extreme magnetopause positions that do not agree with
previous findings that the magnetopause is significantly expanded during the quasi-radial
IMF. |
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