Substorm-Associated Changes in the Particle Precipitation Pattern.
نویسندگان
چکیده
منابع مشابه
Substorm related changes in precipitation in the dayside auroral zone – a multi instrument case study
A period (08:10–14:40 MLT, 11 February 1997) of enhanced electron density in the Dand E-regions is investigated using EISCAT, IRIS and other complementary instruments. The precipitation is determined to be due to substorm processes occurring close to magnetic midnight. Energetic electrons drift eastward after substorm injection and precipitate in the morning sector. The precipitation is trigger...
متن کاملSubstorm inner plasma sheet particle reduction
[1] Geotail measurements from within the equatorial inner plasma sheet at r 10–13 RE are used to show that a reduction in equatorial plasma pressure within the current wedge is a general feature of substorms and that this decrease is simultaneous with the wellknown expansion phase increase in energetic particle fluxes. The decrease in pressure is found to be due to a decrease in particle fluxes...
متن کاملSubstorm-associated large-scale magnetic field changes in the magnetotail: a prerequisite for “magnetotail deflation” events
An attempt is made to search for a critical condition in the lobe magnetic field to initiate large-scale magnetic field changes associated with substorm expansions. Using data from ISEE-1 for 1978, sudden decreases in the lobe magnetic field accompanied by magnetic field dipolarizations are identified. In this study, such events are designated as the magnetotail deflation. The magnetic field co...
متن کاملAKR breakup and auroral particle acceleration at substorm onset
[1] The dynamical behavior of auroral kilometric radiation (AKR) is investigated in connection with auroral particle acceleration at substorm onsets using high-time-resolution wave spectrograms provided by Polar/PWI electric field observations. AKR develops explosively at altitudes above a preexisting low-altitude AKR source at substorm onsets. This ‘‘AKR breakup’’ suggests an abrupt formation ...
متن کاملRelation of the auroral substorm to the substorm current wedge
The auroral substorm is an organized sequence of events seen in the aurora near midnight. It is a manifestation of the magnetospheric substorm which is a disturbance of the magnetosphere brought about by the solar wind transfer of magnetic flux from the dayside to the tail lobes and its return through the plasma sheet to the dayside. The most dramatic feature of the auroral substorm is the sudd...
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ژورنال
عنوان ژورنال: Journal of geomagnetism and geoelectricity
سال: 1992
ISSN: 0022-1392
DOI: 10.5636/jgg.44.1239