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| Titel |
Dayside flow bursts and high-latitude reconnection when the IMF is strongly northward |
| VerfasserIn |
H. Hu, T. K. Yeoman, Mark Lester, R. Liu, H. Yang, A. Grocott |
| 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 ; 24, no. 8 ; Nr. 24, no. 8 (2006-09-13), S.2227-2242 |
| Datensatznummer |
250015624
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| Publikation (Nr.) |
 copernicus.org/angeo-24-2227-2006.pdf |
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| Zusammenfassung |
| The characteristics of dayside ionospheric convection are
studied using Northern Hemispheric SuperDARN data and DMSP particle and flow
observations when the interplanetary magnetic field (IMF) was strongly
northward during 13:00–15:00 UT on 2 March 2002. Although IMF Bx was
positive, which is believed to favour Southern Hemisphere high-latitude
reconnection at equinox, a four-cell convection pattern was observed and
lasted for more than 1.5 h in the Northern Hemisphere. The reconnection
rate derived from an analysis of the Northern Hemisphere SuperDARN data
illustrates that the high-latitude reconnection was quasi-periodic, with a
period between 4–16 min. A sawtooth-like and reverse-dispersed ion signature
was observed by DMSP-F14 in the sunward cusp convection at around 14:41 UT,
confirming that the high-latitude reconnection was pulsed. Accompanying the
pulsed reconnection, strong antisunward ionospheric flow bursts were
observed in the post-noon LLBL region on closed field lines, propagating with
the same speed as the plasma convection. DMSP flow data show that a similar
flow pattern and particle precipitation occurred in the conjugate Southern Hemisphere. |
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