Dynamics of duskside proton aurora observed with the Svalbard all-sky imager and the IMAGE satellite under northward IMF condition : November 26, 2000 event

Details Dynamics of duskside proton aurora observed with the Svalbard all-sky imager and the IMAGE satellite under northward IMF condition : November 26, 2000 event Dynamics of duskside proton aurora observed with the Svalbard all-sky imager and the IMAGE satellite under northward IMF condition : November 26, 2000 event

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsm31b0763y&link_type=abstract

American Geophysical Union, Fall Meeting 2001, abstract #SM31B-0763

Physics

2704 Auroral Phenomena (2407), 2716 Energetic Particles, Precipitating, 2724 Magnetopause, Cusp, And Boundary Layers, 2740 Magnetospheric Configuration And Dynamics, 2784 Solar Wind/Magnetosphere Interactions

Scientific paper

Imaging of proton aurora is an excellent probe to monitor the magnetospheric dynamics. Particularly, imaging of high-latitude proton aurora enables us to investigate phenomena related to magnetospheric boundary processes. We have been operating an all-sky proton aurora imager at Longyearbyen (75.3 N invariant latitude) in Svalbard on a routine basis. In this paper, we focus on an interval 11-16 UT on November 26, 2000 when large enhancements of proton aurora occurred twice associated with the arrival of solar wind fast shocks identified by SSCs at 07:58 UT and 11:58 UT. The IMF observed by the WIND spacecraft was mostly northward (Bz = about 15 nT) during the period of 11-16 UT, except intermittent southward IMF turnings during the period of 12:22-13:18 UT and 14:50-15:08 UT. The averaged pressure, density and velocity of solar wind were 15 nPa, 20 /cc and 600 km/s, respectively. Enhancements of proton aurora in the dusk sector beginning at 11:58 T in association with SSC lasted over 40 min. Then quasi-periodic enhancements of proton aurora with a peak intensity of 300 R of Hb and a period of about 30 min occurred in the dusk sector in the following time period from 13:30 to 16:00 UT. By comparing proton aurora images obtained from the Svalbard all-sky imager and the IMAGE/FUV instrument with charged particle data obtained by DMSP and GEOTAIL spacecraft, it is suggested that these proton aurora enhancements are results of precipitation of protons with energy of about 10 keV in the boundary plasma sheet (BPS) adjacent to the dusk sector magnetopause. We also compared proton aurora images obtained at Longyearbyen with ionospheric plasma convection patterns obtained by the Super DARN network. From these data analyses, we clarify the mechanisms of these proton aurora enhancements in the dusk sector. We also discuss the injection processes of solar wind protons across the magnetopause and the heating and acceleration processes of injected protons in the magnetopause boundary region under northward IMF condition.

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