Mechanisms and time-scales of the magnetospheric response to the interplanetary magnetic field changes during the 8 May 1986 substorm |
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| Affiliation: | 1. Department of Physics, Doon University, Dehradun, India;2. Department of Physics, Babasaheb Bhimrao Ambedkar University, Lucknow, India;3. Indian Institute of Tropical Meteorology, Ministry of Earth Sciences, Govt. of India, India;4. Dr K S Krishnan Geomagnetic Research Laboratory, Indian Institute of Geomagnetism, Prayagraj, India;5. National Centre for Polar and Ocean Research, Goa, India;1. Mbarara University of Science and Technology, Department of Physics, Mbarara P. O. Box 1410, Uganda;2. Muni University, Department of Physics, Arua P.O. Box 725, Uganda;3. Swedish Institute of Space Physics, Uppsala, Sweden;4. South African National Space Agency, Hospital Street, Hermanus P. O. Box 32, South Africa;5. Rhodes University Makhanda, Department of Physics and Electronics, 6139, Eastern Cape, P. O. Box 6140, South Africa;1. Department of Physics, University of Lagos, Akoka, Yaba, Lagos, Nigeria;2. National Space Research and Development Agency, Abuja, Nigeria;3. STEM Preparatory Academy, Nashville, TN, United States |
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| Abstract: | On 8 May 1986, between 1113 and 1600 UT, an isolated magnetospheric substorm was observed, during which the AE-index exceeded 700 nT (CDAW 9E event). Three available sets of measurements (a) of the solar-wind parameters (IMP-8 satellite), (b) of the magnetotail energy flux (ISEE-1 spacecraft), and (c) of ground magnetic observatories, allowed us to make a detailed study of the overall magnetospheric response to changes of the interplanetary magnetic field (IMF) direction, during this event of weak solar-wind coupling.In order to study the mechanisms and time-delays of the magnetospheric response to the abrupt increase of the solar-wind energy input, we have evaluated the total magnetospheric energy output UT following two different methods: (a) Akasofu's method, taking the ring current decay time τR constant, and (b) Vasyliunas' method where the values of ut are independent of the solar-wind energy input as determined from the epsilon parameter. Both methods suggest that the driven system has been considerably developed during this substorm, while an unloading event has been superposed at the expansion onset. |
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