Auroral particle precipitation characterized by the substorm cycle
نویسندگان
چکیده
منابع مشابه
AKR 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...
متن کاملSubstorm 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 کامل‘‘Blob’’ Analysis of Auroral Substorm Dynamics
One month’s worth of POLAR UVI data were subjected to a ‘‘blob’’ analysis to determine the statistical dynamics of substorm features observed in the LBHL band (152-188 nm). Adapted from similar DoD analyses of target images, the analysis consists of finding, on a frame-by-frame basis beginning at substorm onset, the following aspects of an individual auroral feature: peak power (i.e., power of ...
متن کاملAuroral precipitation fading before and at substorm onset: ionospheric and geostationary signatures
Rapid fading of auroral activity a few minutes before substorm breakup has earlier been analyzed in case-studies. Here we report on a study in which all-sky camera (ASC) and magnetic data over 3 years were examined to ®nd breakups that were accompanied by a preceding fading. To illustrate typical features of the fading eect we analyze three events in detail and discuss seven other events to ®n...
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ژورنال
عنوان ژورنال: Journal of Geophysical Research: Space Physics
سال: 2013
ISSN: 2169-9380
DOI: 10.1002/jgra.50160