Role of overshielding electric field on the development of pre-midnight plume event: Simulation results |
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| Institution: | 1. University of Sheffield, Sheffield S1 3JD, UK;2. Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria;3. Hokkaido University, 060-0810 Sapporo, Japan;4. National Cheng-Kung University, Taiwan City 701, Taiwan;5. Kyoto University, Uji, Kyoto 611-0011, Japan;1. West Department of Pushkov Institute of Terrestrial Magnetism, Ionosphere and Radio Wave Propagation RAS, Kaliningrad 236017, Russia;2. Immanuel Kant Baltic Federal University, Alexandra Nevskogo Str., 14, Kaliningrad 236041, Russia;3. Pushkov Institute of Terrestrial Magnetism, Ionosphere and Radio Wave Propagation RAS, Troitsk, Moscow Region 142190, Russia;4. Institute of Solar-Terrestrial Physics SB RAS, Irkutsk, Russia;5. Institute for Cosmophysical Research and Aeronomy, Yakutsk, Russia;1. Departamento de Física, Facultad de Ciencias, Universidad de Santiago, Santiago 9170124, Chile;2. Departamento de Física, Facultad de Ciencias, Universidad de Chile, Santiago 7800003, Chile;3. Centro para el Desarrollo de la Nanociencia y Nanotecnologia, CEDENNA, Chile;1. State Key Laboratory of Astronautic Dynamics, Xi''an 710043, China;2. Institutes of Meteorology and Oceanography, National University of Defense Technology, Nanjing 211101, China;1. Department of Electric and Computer Engineering, University of New Mexico, Albuquerque, New Mexico, USA;2. Configurable Space Microsystems Innovations & Applications Center, Albuquerque, New Mexico, USA;3. High Altitude Observatory, National Center for Atmospheric Research, Boulder, Colorado, USA;4. Air Force Research Laboratory, Space Vehicles Directorate, Kirtland AFB, New Mexico, USA;1. Indian Institute of Geomagnetism, New Panvel (W), Navi Mumbai, India;2. University of the Western Cape, Robert Sobukwe Road, Bellville 7535, South Africa |
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| Abstract: | An investigation involving nonlinear numerical simulation has been undertaken based on the observations of two events involving the reversal of nighttime zonal electric field to eastward direction over equatorial region due to the overshielding effect associated with interplanetary electric field. In one of the events, the ionospheric alterations brought forth by the prompt penetration event lead to the triggering of an equatorial spread F (ESF) event around 2040 IST and a plume structure during pre-midnight hours due to overshielding effect. In another observation, the ESF was found to be absent. The two-dimensional modeling investigation revealed that the storm-induced eastward electric field during nighttime over equatorial region is a necessary but not a sufficient condition for the development of the pre-midnight plume structure in the lower F-region altitude. The large scale size (240 km) perturbation amplitude of 5% is found to be insufficient for the development of late night plume event within 2000 s. A pre-seed in varying degrees in a localized altitude region depending upon the background ionospheric conditions, is found to be required for the development of the pre-midnight plume event. The confined ESF irregularities developed in the post-evening hours in a limited altitude range are suggested to provide such seed perturbation. The importance of the pre-seeded structure for the development of pre-midnight plume event is brought out from this investigation. The roles of the electron density scale length and the peak height of the F layer in deciding the required amplitudes of perturbation are also evaluated. This, in turn, can throw light on the night-to-night variability of storm-time ESF when a typical eastward perturbation electric field is operative during pre-midnight hours. The role of off-equatorial E region conductivity is also discussed. |
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