If substorm onset triggers tail reconnection, what triggers substorm onset?
نویسندگان
چکیده
منابع مشابه
Tail reconnection triggering substorm onset.
Magnetospheric substorms explosively release solar wind energy previously stored in Earth's magnetotail, encompassing the entire magnetosphere and producing spectacular auroral displays. It has been unclear whether a substorm is triggered by a disruption of the electrical current flowing across the near-Earth magnetotail, at approximately 10 R(E) (R(E): Earth radius, or 6374 kilometers), or by ...
متن کاملDeterminations of Relative Timing of Near-earth Substorm Onset and Tail Reconnection
Several studies have recently been performed that are directed towards determining the timing of near-Earth neutral line (NENL) formation in the tail relative to substorm onset. These studies are reviewed here. It is found that they are all consistent with each other and that they show that NENL formation does not occur prior to substorm onset in the inner plasma sheet. This result is inconsist...
متن کاملFundamental Aspects of Substorm Onset
We now know that substorm onset occurs within the near-Earth plasma sheet in the region associated with the Harang electric field reversal. It is also known that substorm onset is generally associated with a reduction in the large-scale convection driven by the solar wind, and that this reduction is imparted to the ionosphere a few minutes prior to substorm onset. This is the same time relative...
متن کاملThe Significance of Tail Instabilities in Triggering Substorm Onset
Geomagnetotail is the main reservoir where the energy from the solar wind is accumulated and then suddenly released during substorms. Consistent with the modern results of the nonlinear data processing of the substorm activity, this release is described in terms of the appropriate plasma instabilities. It is shown that the tearing mode, resulting in the formation of the X-line, can be unstable ...
متن کاملRelative timing of substorm onset phenomena
[1] In this paper we examine the temporal ordering of midtail flow bursts, Pi2 pulsations, and auroral arc brightening at substorm onset. We present three substorm events for which the Geotail spacecraft was situated at local midnight, near the inner edge of the plasmasheet. We show that high-speed, convective Earthward directed plasma flows observed by Geotail occurred 1–3 min before auroral o...
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ژورنال
عنوان ژورنال: Journal of Geophysical Research: Space Physics
سال: 2012
ISSN: 0148-0227
DOI: 10.1029/2012ja018161