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| Titel |
The effect of the high-speed stream following the corotating interaction region on the geomagnetic activities |
| VerfasserIn |
S. Watari |
| 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 ; 15, no. 6 ; Nr. 15, no. 6, S.662-670 |
| Datensatznummer |
250012826
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| Publikation (Nr.) |
 copernicus.org/angeo-15-662-1997.pdf |
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| Zusammenfassung |
| The high-speed stream following the
corotating interaction regions (CIRs) was analyzed. As a result of the analysis,
it is found that the geomagnetic field is continuously disturbed in the
high-speed stream in question. The geomagnetic disturbances with long duration
recurred several rotations between December 1993 and June 1994. These
disturbances were associated with a large recurrent coronal hole expanding from
the south pole of the Sun. High-speed solar wind from this coronal hole was
observed by the IMP-8 satellite during this period. However, the observed
intensities of the geomagnetic disturbances were different for each recurrent
period. This is explained by the seasonal effect. The disturbed geomagnetic
condition continued in the high-speed stream after the passage of the CIRs. The
long duration of these disturbances can be explained by the continuous energy
input into the Earth's magnetosphere from the high-speed regions following the
CIRs. This kind of long-duration geomagnetic disturbance in association with
coronal holes has been observed in the declining phase of other solar cycles.
The relation between the coronal-hole area and the maximum solar-wind velocity
is not good for the well-developed large coronal hole analyzed here. |
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