Small and meso-scale properties of a substorm onset auroral arc
نویسندگان
چکیده
منابع مشابه
Relations between multiple auroral streamers, preonset thin arc formation, and substorm auroral onset
[1] Recent ground‐based imager observations have provided evidence of precursor auroral activity leading to substorm auroral onset, where the precursor is initiated by a poleward boundary intensification (PBI) followed by an auroral streamer moving equatorward toward the onset latitude leading to substorm auroral onset. However, since many streamers do not lead to substorms, the question arises...
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 کاملVertical evolution of auroral acceleration at substorm onset
This study describes the onset process of auroral substorms in connection with the vertical evolution of auroral particle acceleration, on the basis of auroral kilometric radiation (AKR) dynamics. We show that the auroral acceleration process at substorm onset basically consists of two stages: (1) appearance/intensification of a low-altitude acceleration region at 4000–5000 km accompanied by in...
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 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 ...
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ژورنال
عنوان ژورنال: Journal of Geophysical Research: Space Physics
سال: 2010
ISSN: 0148-0227
DOI: 10.1029/2010ja015537