An auroral westward flow channel (AWFC) and its relationship to field-aligned current, ring current, and plasmapause location determined using multiple spacecraft observations
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چکیده
منابع مشابه
An auroral westward flow channel (AWFC) and its relationship to field-aligned current, ring current, and plasmapause location determined using multiple spacecraft observations
An auroral westward flow channel (AWFC) is a latitudinally narrow channel of unstable F-region plasma with intense westward drift in the dusk-to-midnight sector ionosphere. AWFCs tend to overlap the equatorward edge of the auroral oval, and their life cycle is often synchronised to that of substorms: they commence close to substorm expansion phase onset, intensify during the expansion phase, an...
متن کاملOn the lifetime and extent of an auroral westward flow channel (AWFC) observed during a magnetospheric substorm
A −190-nT negative bay in the geomagnetic X component measured at Macquarie Island (−653) showed that an ionospheric substorm occurred during 09:58 to 11:10 UT on 27 February 2000. Signatures of an auroral westward flow channel (AWFC) were observed nearly simultaneously in the backscatter power, LOS Doppler velocity, and Doppler spectral width measured using the Tasman International Geospace En...
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Earthward injections of energetic ions and electrons mark the onset of magnetospheric substorms. In the inner magnetosphere (L∼4), the energetic ions drift westward and the electrons eastward, thereby enhancing the equatorial ring current. Wave-particle interactions can accelerate these particles to radiation belt energies. The ions are injected slightly closer to Earth in the pre-midnight sect...
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Our examination of the 20 years of magnetospheric magnetic field data from ISEE, AMPTE/CCE and Polar missions has allowed us to quantify how the ring current flows and closes in the magnetosphere at a variety of disturbance levels. Using intercalibrated magnetic field data from the three spacecraft, we are able to construct the statistical magnetic field maps and derive 3-dimensional current de...
متن کاملFirst current density measurements in the ring current region using simultaneous multi-spacecraft CLUSTER-FGM data
The inner magnetosphere’s current mapping is one of the key elements for current loop closure inside the entire magnetosphere. A method for directly computing the current is the multi-spacecraft curlometer technique, which is based on the application of Maxwell-Ampère’s law. This requires the use of four-point magnetic field high resolution measurements. The FGM experiment on board the four Clu...
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ژورنال
عنوان ژورنال: Annales Geophysicae
سال: 2007
ISSN: 1432-0576
DOI: 10.5194/angeo-25-59-2007