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Key features of >30 keV electron precipitation during high speed solar wind streams: A superposed epoch analysis

Kavanagh, Andrew and Honary, Farideh and Donovan, E.F. and Ulich, T. and Denton, Michael (2012) Key features of >30 keV electron precipitation during high speed solar wind streams: A superposed epoch analysis. Journal of Geophysical Research, 117. pp. 1-13. ISSN 0148-0227

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Abstract

We present an epoch analysis of energetic (>30 keV) electron precipitation during 173 high speed solar wind streams (HSS) using riometer observations of cosmic noise absorption (CNA) as a proxy for the precipitation. The arrival of the co-rotating interaction region (CIR) prior to stream onset, elevates the precipitation which then peaks some 12 h after stream arrival. Precipitation continues for several days following the HSS arrival. The MLT distribution of CNA is generally consistent with the statistical pattern explained via the substorm process, though the statistical deep minimum of CNA/precipitation does change during the HSS suggesting increased precipitation in the 15–20 MLT sector. The level of precipitation is strongly controlled by the average state of the IMF BZ component on the day prior to the arrival of the stream interface. An average negative IMF BZ will produce higher CNA across all L-shells and MLT, up to 100% higher than an average positive IMF BZ.

Item Type: Article
Journal or Publication Title: Journal of Geophysical Research
Additional Information: ©2012. American Geophysical Union. All Rights Reserved.
Subjects: Q Science > QC Physics
Departments: Faculty of Science and Technology > Physics
ID Code: 55139
Deposited By: ep_importer_pure
Deposited On: 18 Jun 2012 10:05
Refereed?: Yes
Published?: Published
Last Modified: 23 Apr 2014 17:00
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/55139

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