Interplanetary fast forward shocks and their geomagnetic effects: CAWSES events |
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| Authors: | E Echer BT Tsurutani FL Guarnieri JU Kozyra |
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| Institution: | 1. Instituto Nacional de Pesquisas Espaciais, Sao Jose dos Campos, SP, Brazil;2. Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, USA;3. Technical University of Braunschweig, Germany;4. Universidade do Vale do Paraiba (UNIVAP), Sao Jose dos Campos, SP, Brazil;5. University of Michigan, Ann Arbor, MI, USA;1. Observatório Nacional, Rua General José Cristino, 77, 20921-400 Rio de Janeiro, Brazil;2. Departamento de Geofísica, Instituto de Astronomia, Geofísica e Ciências Atmosféricas, Universidade de São Paulo, Rua do Matão, 1226, 05508-090 São Paulo, Brazil;3. Université de Nantes, Nantes Atlantiques Universités, UMR CNRS 6112, Laboratoire de Planétologie et de Géodynamique, 2 rue de la Houssinière, 44000 Nantes, France;1. Key Laboratory of Earth and Planetary Physics, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China;1. Indian Institute of Geomagnetism, New Panvel, Mumbai, India;2. Department of Physics, University of Bahrain, Bahrain;1. Department of Physics, Tai Solarin University of Education, Ijagun, P.M.B 2118, Ijebu Ode, Ogun State, Nigeria;2. Department of Physics, Lancaster University, Lancaster, United Kingdom;3. Department of Physics, University of Lagos, Akoka, Nigeria;1. Space and Atmospheric Sciences Division, Physical Research Laboratory, Navrangpura, Ahmedabad, India;2. Center for Space Physics, Boston University, Boston, MA, USA;3. Department of Physics and Applied Physics, University of Massachusetts, One University Avenue, Lowell, MA, USA |
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| Abstract: | The seven CAWSES interplanetary fast forward shocks and their geomagnetic effects during 2004–2005 have been analyzed. It is found that the arrival time of the shocks at Earth can be estimated within an accuracy of ～5 min. Furthermore, AL decreases are found to occur within 10 min of shock impingement on the magnetopause. It was also determined that there is a direct correlation between the interplanetary magnetic field southward directed (IMF Bs) prior to shock arrival and substorms triggered by the shocks. If the IMF is northward prior to shock arrival, the geomagnetic activity is present but is low. One interpretation of this result is that the preconditioning energy stored in the magnetotail leaks away rapidly. A correlation between substorm peak AL and shock strength (Mach number) has also been noted, which could imply that shock strength is important for the amount of energy released into the magnetosphere/ionosphere. |
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