Physics
Scientific paper
Oct 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007jgra..11210217l&link_type=abstract
Journal of Geophysical Research, Volume 112, Issue A10, CiteID A10217
Physics
4
Magnetospheric Physics: Auroral Phenomena (2407), Magnetospheric Physics: Energetic Particles: Precipitating, Magnetospheric Physics: Substorms, Magnetospheric Physics: Field-Aligned Currents And Current Systems (2409), Magnetospheric Physics: Plasma Sheet
Scientific paper
Using 50 high-quality events from the Canadian Auroral Network for the OPEN Program Unified Study (CANOPUS) Gillam Meridian Scanning Photometer over 10 a (1989-1998), we show that proton aurora in the substorm growth phase exhibits a systematic tendency to fade. The average pattern of fading consists of a period of relatively stable proton aurora brightness and then a period of 15-20 min before onset during which the brightness decreases by an average of 15%. We interpret the observed proton aurora brightness variation in terms of the magnetic field stretching in the near-Earth magnetosphere; in particular, the fading is interpreted as a result of the central plasma sheet magnetic field lines having stretched to such a degree that the loss cone closing effect dominates precipitation due to nonadiabatic proton motions.
Donovan Eric F.
Jackel Brian
Jayachandran P. T.
Liang Jun
Liu Wende
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