 |
| Titel |
Contributions of the tail current with substorm injections during geomagnetic storms |
| VerfasserIn |
Zhaohai He, Lei Dai, Chi Wang, Tao Chen, Zhenxing Liu, Ilan Roth, Su Ping Duan, Han Wu |
| Konferenz |
EGU General Assembly 2016
|
| Medientyp |
Artikel
|
| Sprache |
en
|
| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 18 (2016) |
| Datensatznummer |
250124211
|
| Publikation (Nr.) |
 EGU/EGU2016-3606.pdf |
|
|
|
|
|
| Zusammenfassung |
| We statistically analyzed 153 geomagnetic storm events (195 GOES events) to study the
contributions of the tail current to SYM-H index during the early recovery phase for four
different intensities. The results give the evidence that the ring current may continue to
intensify after the disruption of tail current as Ohtani et al. [2001] suggested. The superposed
epoch analysis of IMF Ey shows that IMF Ey can no longer support the SYM-H decreasing at
the minimum of SYM-H, so it is reasonable to consider that the ring current enhancement is
due to substorm-associated injection. The time scale of disruption of the tail current may
depend on the intensity of geomagnetic storms. The percentage contributions of tail
current to SYM-H index weaken as the intensity of geomagnetic storms increases.
The effect of substorm injections has been evaluated as about half of the actual
percentage of tail current for average, and the actual percentages of tail current for
four intensities are 52.7%, 38.2%, 23.2% and 13.6% with an average about 35%.
The tail current is dominant for the small geomagnetic storms (SYM-H>-50nT). |
|
|
|
|
|
|