Observations of polar cap flow channel and plasma sheet flow bursts during substorm expansion
نویسندگان
چکیده
منابع مشابه
Polar observations of transverse magnetic pulsations initiated at substorm onset in the high-latitude plasma sheet
[1] This paper presents simultaneous observations of 6-mHz magnetic pulsations in the nightside high-latitude plasma sheet, inner plasma sheet at the geosynchronous distance, and auroral region on the ground in association with substorm onset. We study an isolated substorm (AE 300 nT) onset on 19 October 1999 at 0145 UT. The Polar spacecraft was located in the plasma sheet near the plasma sheet...
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Using data from the EISCAT (European Incoherent Scatter) VHF radar and DMSP (Defense Meteorological Satellite Program) spacecraft passes, we study the motion of the dayside open-closed field line boundary during two substorm cycles. The satellite data show that the motions of ion and electron temperature boundaries in EISCAT data, as reported by Moen et al. (2004), are not localised around the ...
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[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 کاملTranspolar voltage and polar cap flux during the substorm cycle and steady convection events
[1] Transpolar voltages observed during traversals of the polar cap by the Defense Meteorological Satellite Program (DMSP) F-13 spacecraft during 2001 are analyzed using the expanding-contracting polar cap model of ionospheric convection. Each of the 10,216 passes is classified by its substorm phase or as a steady convection event (SCE) by inspection of the AE indices. For all phases, we detect...
متن کاملPreonset time sequence of auroral substorms: Coordinated observations by allsky imagers, satellites, and radars
[1] Using two conjunction events of the Time History of Events and Macroscale Interactions during Substorms (THEMIS) imagers and spacecraft as well as the Super Dual Auroral Radar Network (SuperDARN) and Poker Flat Incoherent Scatter Radars, we show that longitudinally narrow flow bursts in the nightside polar cap can precede poleward boundary intensifications (PBIs) that are followed by equato...
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ژورنال
عنوان ژورنال: Journal of Geophysical Research: Space Physics
سال: 2013
ISSN: 2169-9380
DOI: 10.1002/jgra.50119