Energetic particle precipitation in the Brazilian geomagnetic anomaly during the "Bastille Day storm" of July 2000
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概要
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Ionospheric absorption associated with a great geomagnetic storm on July 15-16, 2000 (the "Bastille Day storm") was observed in the Brazilian geomagnetic anomaly using a two-dimensional 4 × 4 imaging riometer (IRIS). In the afternoon of July 15, weak absorption (-0.2 dB) was observed during the initial phase of the storm; large spatial-scale absorption exceeded the IRIS field of view (330×330 km). During the sharp magnetic decrease in the main phase of the storm, absorption was intensified (<0.5 dB) in the evening, showing a sheet structure with-150 km latitudinal width and >330 km longitudinal elongation. Subsequently, absorption was intensified (-1 dB), having a small spatial-scale (-150 km) in the background sheet structure and a pronounced westward drift (-570 m s<SUP>-1</SUP>). In association with large magnetic fluctuations in the Bz component of the interplanetary magnetic field (IMF), the ground magnetic variation in the night sector showed large positive swings during the initial to main phases of the storm. With the subsequent southward turning of the IMF Bz, the ground magnetic variation in the evening sector showed rapid storm development. Particle fluxes measured by a geosynchronous satellite (<I>L</I> =-6.6) demonstrated large enhancements of low-energy protons (50-400 keV) and probably electrons (50-225 keV) during the storm's initial phase. Particle fluxes from the low-altitude NOAA satellite (-870 km) indicated the invasion of low-energy particles into the region of <I>L</I> < 2 during the main phase of the storm. These results indicate that low-energy particles injected into the outer radiation belt in association with frequent and strong substorm occurrences, were transported into the inner radiation belt through direct convective access by the storm-induced electric fields during the storm's development. These particles then precipitated into the ionosphere over the Brazilian geomagnetic anomaly. Notably, the most intense absorption could be dominantly caused by proton precipitation with energies of -40 keV.
- 公益社団法人 日本地震学会、地球電磁気・地球惑星圏学会 、特定非営利活動法人 日本火山学会、日本測地学会、日本惑星科学会の論文
著者
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Yumoto Kiyofumi
Space Environment Research Center Kyushu University
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Miyoshi Yoshizumi
Solar-terrestrial Environment Laboratory Nagoya University
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Nishino Masanori
Solar-terrestrial Environment Laboratory Nagoya University
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MAKITA Kazuo
Basic Education Series, Physics, Takushoku University
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SCHUCH Nelson
INPE, Southern Space Research Center
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ABDU Mangalathayil
INPE, Sao Jose dos Campos
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