 |
| Titel |
The high latitude convection response to an interval of substorm activity |
| VerfasserIn |
T. K. Yeoman, M. Pinnock |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
0992-7689
|
| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 14, no. 5 ; Nr. 14, no. 5, S.518-532 |
| Datensatznummer |
250012290
|
| Publikation (Nr.) |
 copernicus.org/angeo-14-518-1996.pdf |
|
|
|
|
|
| Zusammenfassung |
| On 17 March 1991, five clear substorm
onsets/intensifications took place within a three hour interval. During this
interval ground-based data from the EISCAT incoherent scatter radar, a digital
CCD all sky camera, and an extensive array of magnetometers were available, in
addition to data from the CRRES and DMSP spacecraft, whose footprints passed
over Scandinavia very close to most of the ground-based instrumentation. This
interval of substorm activity has been interpreted as being in support of a
near-Earth current disruption model of substorm onset. In the present study the
ionospheric convection response, observed some four hours to the west in MLT by
the Halley HF radar in Antarctica, is related to the growth, expansion and
recovery phases of two of the substorm onsets/expansions observed in the
Northern Hemisphere. Bursts of ionospheric flow and motion of the convection
reversal boundary (CRB) are observed at Halley in response to the substorm
activity and changes in the IMF. The delay between the substorm expansion phase
onset and the response in the CRB location is dependent on the local time
separation from, and latitude of, the initial substorm onset region. These
results are interpreted in terms of a synthesis of the very near-Earth current
disruption model and the near-Earth neutral line model of substorm onset. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|