Magnetotail behavior during storm time “sawtooth injections”
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چکیده
منابع مشابه
Energetic electron precipitation during sawtooth injections
We present simultaneous riometer observations of cosmic noise absorption in the nightside and dawn-noon sectors during sawtooth particle injections during 18 April 2002. Energetic electron precipitation (>30 keV) is a feature of magnetospheric substorms and cosmic radio noise absorption acts as a proxy for qualitatively measuring this precipitation. This event provides an opportunity to compare...
متن کاملCharacterizing the 18 April 2002 storm-time sawtooth events using ground magnetic data
[1] Beginning during the last half of the main phase and extending for over 12 hours, the 18 April 2002 magnetic storm is dominated by sawtooth oscillations. We examine the ground magnetic signatures of these events at both high latitudes and low latitudes. The first immediate observation is that the magnetic signatures from one sawtooth to another can show considerable variation. Thus the curr...
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Violent releases of space plasma energy from the Earth's magnetotail during substorms produce strong electric currents and bright aurora. But what modulates these currents and aurora and controls dissipation of the energy released in the ionosphere? Using data from the THEMIS fleet of satellites and ground-based imagers and magnetometers, we show that plasma energy dissipation is controlled by ...
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Recent observations from the THEMIS mission have focused attention on the timing of events in the magnetotail during magnetospheric substorms and other periods of geomagnetic activity. Standard models of substorms have generally emphasized convective flows as the major source of energy and momentum transport; however, Alfvén wave propagation can also be an important transport mechanism. The pro...
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We study one event of reconnection onset associated to a small substorm on 27 September 2006 by using Cluster observations at inter-spacecraft separation of about 10 000 km. We focus on the acceleration of suprathermal electrons during different stages of reconnection. We show that several distinct stages of acceleration occur: (1) moderate acceleration during reconnection of pre-existing plasm...
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ژورنال
عنوان ژورنال: Journal of Geophysical Research
سال: 2004
ISSN: 0148-0227
DOI: 10.1029/2004ja010543