On the relationship of SAPS to storm-enhanced density |
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| Institution: | 1. Massachusetts Institute of Technology, Haystack Observatory, Westford, MA, USA;2. Lunar and Planetary Laboratory, University of Arizona, Tucson, AZ, USA;3. Air Force Research Laboratory, Hanscom AFB, Ma,USA;1. Stanford University, Stanford, USA;2. Southwest Research Institute, San Antonio, USA;3. University of California, Los Angeles, USA;1. School of Geodesy and Geomatics, Wuhan University, Wuhan 430079, China;2. Collaborative Innovation Center for Geospatial Technology, Wuhan 430079, China;1. Geodynamics Research Laboratory, University of Warmia and Mazury, 1 Oczapowskiego st., 10-719 Olsztyn, Poland;2. West Department of IZMIRAN, 41 Pobeda Av., 236010 Kaliningrad, Russia;1. Atmospheric Research Lab., Department of Physics, Banaras Hindu University, Varanasi 221005, India;2. Faculty of Physical Sciences, Shri Ramswaroop Memorial University, Lucknow-Dewa Road, Barabanki, India;3. KSK Geomagnetic Research Laboratory, IIG, Prayagraj, UP, India;1. Ethiopian Space Science Technology Institute, Entoto Observatory and Research Center, Addis Ababa, Ethiopia;2. Bule Hora University, College of Natural and Computational Science, Department of Physics, Bule Hora, Ethiopia;3. South Africa National Space Agency, Space Science, Hermanus, South Africa;4. Department of Physics and Electronics, Rhodes University, Grahamstown, South Africa;5. Washera Geospace and Radar Science Laboratory, Physics Department, Bahir Dar University, Bahir Dar, Ethiopia |
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| Abstract: | We use magnetic field-aligned mapping between the ionosphere and the magnetosphere to intercompare ground-based observations of storm enhanced density (SED), and plasmasphere drainage plumes imaged from space by the IMAGE EUV imager, with the enhanced inner-magnetosphere/ionosphere SAPS electric field which develops during large storms. We find that the inner edge of the SAPS electric field overlaps the erosion plume and that plume material is carried sunward in the SAPS overlap region. The two phenomena, SED in the ionosphere and the erosion plume at magnetospheric heights, define a common trajectory for sunward-propagating cold plasma fluxes in the midnight—dusk–postnoon sector. The SAPS channel at ionospheric heights and its projection into the equatorial plane serve to define the sharp outer boundary of the erosion plume. The SAPS electric field abuts and overlaps both the plasmasphere boundary layer and the plasmasphere erosion plume from pre-midnight through post-noon local times. |
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