Comprehensive ground-based and in situ observations of substorm expansion phase onset
نویسندگان
چکیده
منابع مشابه
Comprehensive ground‐based and in situ observations of substorm expansion phase onset
[1] In this paper, we present comprehensive ground‐based and space‐based in situ geosynchronous observations of a substorm expansion phase onset on 1 October 2005. The Double Star TC‐2 and GOES‐12 spacecraft were both located within the substorm current wedge during the substorm expansion phase onset, which occurred over the Canadian sector. We find that an onset of ULF waves in space was obser...
متن کاملWavelet-based ULF wave diagnosis of substorm expansion phase onset
[1] Using a discrete wavelet transform with a Meyer wavelet basis, we present a new quantitative algorithm for determining the onset time of Pi1 and Pi2 ULF waves in the nightside ionosphere with 20to 40-s resolution at substorm expansion phase onset. We validate the algorithm by comparing both the ULF wave onset time and location to the optical onset determined by the Imager for Magnetopause-t...
متن کاملMagnetic dipolarization with substorm expansion onset
[1] We compare the timing and spatial extent of dipolarization with auroral breakup by using magnetic field data (1-min time resolution) from GOES 8 and GOES 9 and global auroral images (37-s frame rate) from the Polar ultraviolet imager. We survey the entire year of 1997 data and obtain 32 unambiguous dipolarization events that had ionospheric footprints within 2 hours in magnetic local time (...
متن کاملThe correlation of ULF waves and auroral intensity before, during and after substorm expansion phase onset
[1] We present case studies of the evolution of Ultra-Low Frequency (ULF) magnetic wave amplitudes and auroral intensity through the late growth phase and the expansion phase of the substorm cycle. We present strong evidence that substorm-related auroral enhancements are clearly and demonstrably linked to ULF wave amplitudes observed at the same location. In all three case studies presented, th...
متن کاملOn storm weakening during substorm expansion phase
Iyemori and Rao recently presented evidence that the strength of a magnetic storm, as measured by -Dst, weakens, or its rate of growth slows, during the substorm expansion phase. Yet the expansion phase is known to inject energetic particles into the ring current, which should strengthen the storm. We propose to reconcile these apparently contradictory results by combining the virial theorem an...
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ژورنال
عنوان ژورنال: Journal of Geophysical Research: Space Physics
سال: 2010
ISSN: 0148-0227
DOI: 10.1029/2010ja015748