Substorm onset location and dipole tilt angle
نویسندگان
چکیده
منابع مشابه
Fundamental 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 کاملIdentification of substorm onset location and preonset sequence using Reimei, THEMIS GBO, PFISR, and Geotail
[1] We present state‐of‐the‐art multiple instrument observations of an isolated substorm on October 12, 2007. The auroral breakup was observed simultaneously by Reimei, THEMIS ASI, and PFISR. The footprint of Geotail was also near the breakup. These observations allow for detailed study of the breakup location in terms of large‐ and small‐scale auroral morphology, particle precipitation, and io...
متن کاملTail 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 کاملQuantitative maps of geomagnetic perturbation vectors during substorm onset and recovery
We have produced the first series of spherical harmonic, numerical maps of the time-dependent surface perturbations in the Earth's magnetic field following the onset of substorms. Data from 124 ground magnetometer stations in the Northern Hemisphere at geomagnetic latitudes above 33° were used. Ground station data averaged over 5 min intervals covering 8 years (1998-2005) were used to construct...
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: Annales Geophysicae
سال: 2006
ISSN: 1432-0576
DOI: 10.5194/angeo-24-577-2006