Amplitude enhancement of SC(H) events in the South Atlantic anomaly region

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• 作者：N.B. Trivedi ; M.A. Abdu ; B.M. Pathan ; S.L.G. Dutra ; N.J. Schuch ; J.C. Santos and L.M. Barreto
• 关键词：Magnetospheric physics (Energetic particles ; Precipitations ; Energetic particles ; Trapped ; Solar wind-magnetosphere interactions)
• 刊名：Journal of Atmospheric and Solar-Terrestrial Physics
• 出版年：2005
• 出版时间：December 2005
• 年：2005
• 卷：67
• 期：17-18
• 页码：1751-1760
• 全文大小：256 K

文摘

South Atlantic Magnetic Anomaly (SAMA) due to its weak total geomagnetic field science?_ob=MathURL&_method=retrieve&_udi=B6VHB-4GWBWCY-6&_mathId=mml22&_user=10&_cdi=6062&_rdoc=17&_handle=V-WA-A-W-BZ-MsSAYWA-UUW-U-AAVCBDZDBY-AAVWECDCBY-DBCCDWWBE-BZ-U&_acct=C000050221&_version=1&_userid=10&md5=16ad20615bfed9a9c10b121632041b30"" title=""Click to view the MathML source"">F is known to be a sink of trapped charged particles from the inner radiation belt during both magnetically quiet and disturbed periods. Ionosondes, riometers, and VLF radio propagation monitoring experiments have shown ionospheric effects due to increase of ionization caused by the process of electron precipitation in the ionosphere of SAMA region during the quiet and disturbed periods. We have examined the records of geomagnetic horizontal component variations at the time of sudden commencement (SC) from two stations, São Martinho da Serra (SMS) (science?_ob=MathURL&_method=retrieve&_udi=B6VHB-4GWBWCY-6&_mathId=mml23&_user=10&_cdi=6062&_rdoc=17&_handle=V-WA-A-W-BZ-MsSAYWA-UUW-U-AAVCBDZDBY-AAVWECDCBY-DBCCDWWBE-BZ-U&_acct=C000050221&_version=1&_userid=10&md5=be053449a8e147ac5571d7a29ad8d238"" title=""Click to view the MathML source"">29.43S, science?_ob=MathURL&_method=retrieve&_udi=B6VHB-4GWBWCY-6&_mathId=mml24&_user=10&_cdi=6062&_rdoc=17&_handle=V-WA-A-W-BZ-MsSAYWA-UUW-U-AAVCBDZDBY-AAVWECDCBY-DBCCDWWBE-BZ-U&_acct=C000050221&_version=1&_userid=10&md5=7fccd73b14bf5edaf1d7619d4fc25845"" title=""Click to view the MathML source"">53.82W, science?_ob=MathURL&_method=retrieve&_udi=B6VHB-4GWBWCY-6&_mathId=mml25&_user=10&_cdi=6062&_rdoc=17&_handle=V-WA-A-W-BZ-MsSAYWA-UUW-U-AAVCBDZDBY-AAVWECDCBY-DBCCDWWBE-BZ-U&_acct=C000050221&_version=1&_userid=10&md5=1664195d785991b38253bec7102e5237"" title=""Click to view the MathML source"">-19.0 geomagnetic latitude and science?_ob=MathURL&_method=retrieve&_udi=B6VHB-4GWBWCY-6&_mathId=mml26&_user=10&_cdi=6062&_rdoc=17&_handle=V-WA-A-W-BZ-MsSAYWA-UUW-U-AAVCBDZDBY-AAVWECDCBY-DBCCDWWBE-BZ-U&_acct=C000050221&_version=1&_userid=10&md5=5860160fee20304c1396a94ec3fc7d21"" title=""Click to view the MathML source"">33dip) and Vassouras (VSS) (science?_ob=MathURL&_method=retrieve&_udi=B6VHB-4GWBWCY-6&_mathId=mml27&_user=10&_cdi=6062&_rdoc=17&_handle=V-WA-A-W-BZ-MsSAYWA-UUW-U-AAVCBDZDBY-AAVWECDCBY-DBCCDWWBE-BZ-U&_acct=C000050221&_version=1&_userid=10&md5=60957192ea836e8e0bea507f3571ccef"" title=""Click to view the MathML source"">22.40S, science?_ob=MathURL&_method=retrieve&_udi=B6VHB-4GWBWCY-6&_mathId=mml28&_user=10&_cdi=6062&_rdoc=17&_handle=V-WA-A-W-BZ-MsSAYWA-UUW-U-AAVCBDZDBY-AAVWECDCBY-DBCCDWWBE-BZ-U&_acct=C000050221&_version=1&_userid=10&md5=156a83f88ae85c7dfb95ce947c4a8c32"" title=""Click to view the MathML source"">43.65W, science?_ob=MathURL&_method=retrieve&_udi=B6VHB-4GWBWCY-6&_mathId=mml29&_user=10&_cdi=6062&_rdoc=17&_handle=V-WA-A-W-BZ-MsSAYWA-UUW-U-AAVCBDZDBY-AAVWECDCBY-DBCCDWWBE-BZ-U&_acct=C000050221&_version=1&_userid=10&md5=a06b6b9dd496e39dcd3b993dd89b839b"" title=""Click to view the MathML source"">-16.7 geomagnetic latitude and science?_ob=MathURL&_method=retrieve&_udi=B6VHB-4GWBWCY-6&_mathId=mml30&_user=10&_cdi=6062&_rdoc=17&_handle=V-WA-A-W-BZ-MsSAYWA-UUW-U-AAVCBDZDBY-AAVWECDCBY-DBCCDWWBE-BZ-U&_acct=C000050221&_version=1&_userid=10&md5=b2c6dfc7ad5eecde04887938031d2e92"" title=""Click to view the MathML source"">33dip), both situated in the SAMA region at nearly the same magnetic latitude. The science?_ob=MathURL&_method=retrieve&_udi=B6VHB-4GWBWCY-6&_mathId=mml31&_user=10&_cdi=6062&_rdoc=17&_handle=V-WA-A-W-BZ-MsSAYWA-UUW-U-AAVCBDZDBY-AAVWECDCBY-DBCCDWWBE-BZ-U&_acct=C000050221&_version=1&_userid=10&md5=d7a94ead9e1b0db963e93deeaa295a12"" title=""Click to view the MathML source"">SC(H) amplitudes in general are found to be larger at SMS situated close to the center of SAMA, compared to the ones found at the station VSS situated away from the center of SAMA. The results seem to provide an evidence that the amplitude enhancements of the science?_ob=MathURL&_method=retrieve&_udi=B6VHB-4GWBWCY-6&_mathId=mml32&_user=10&_cdi=6062&_rdoc=17&_handle=V-WA-A-W-BZ-MsSAYWA-UUW-U-AAVCBDZDBY-AAVWECDCBY-DBCCDWWBE-BZ-U&_acct=C000050221&_version=1&_userid=10&md5=b13b6bfa956396df78c1752985500fb4"" title=""Click to view the MathML source"">SC(H) impulse in the SAMA region could be caused by the differential increase of ionization due to the continuous loss of electrons and ions from the magnetosphere into the atmosphere of SAMA region.