Asymmetric response of the topside ionosphere to large-scale IGW generated during the November 30, 1979, substorm |
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| Authors: | AT Karpachev GF Deminova N Beloff TD Carozzi PF Denisenko M Lester T Karhunen |
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| Institution: | 1. Department of Ionospheric Research, IZMIRAN, Troitsk, 142190 Moscow Region, Russia;2. Space Science Centre, University of Sussex, Brighton BN1 9QT, UK;3. Institute of Physics, Rostov State University, Rostov-on-Don 344090, Russia;4. Department of Physics and Astronomy, University of Leicester, Leicester LE1 7RH, UK;1. Earth and Environmental Sciences Division, Los Alamos National Laboratory, Los Alamos, NM, 87545, USA;2. Department of Environmental Health and Engineering, The Johns Hopkins University, Baltimore, MD, 21218, USA;3. Sandia National Laboratories, Albuquerque, NM, 87185, USA;4. National Security Education Center, Los Alamos National Laboratory and the New Mexico Consortium, Los Alamos, NM, 87545, USA;5. Department of Materials Science and Engineering, University of Maryland, College Park, MD, 20742, USA;6. NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, MD, 20899, USA;1. Institute of Radiation Safety and Ecology, NNC, Kurchatov, Kazakhstan;2. Russian Institute of Radiology and Agroecology, Obninsk, Russia;1. German Aerospace Center (DLR), Institute of Space Systems, Robert-Hooke-Str. 7, 28359, Bremen, Germany;2. IMS Space Consultancy GmbH at ESA Space Debris Office, Robert-Bosch-Str. 5, 64293, Darmstadt, Germany;3. Technische Universität Berlin, Chair of Space Technology, Straße des 17. Juni 135, 10623, Berlin, Germany;4. Universität Wuerzburg, Aerospace Information Technology, Würzburg, Germany;5. Deutsches Elektronen-Synchrotron DESY, Platanenallee 6, 15738, Zeuthen, Germany |
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| Abstract: | We used bottomside ground observations and topside sounding data from the Intercosmos-19 satellite to study a Travelling Ionospheric Disturbance (TID) that occurred in response to Large-Scale Internal Gravity Wave (LSIGW) propagation during a substorm on November 30, 1979. We built a global scheme for the wavelike ionospheric variations during this medium substorm (AEmax ～800 nT). The area where the TID was observed looks like a wedge since it covers the nighttime hours at subauroral latitudes but contracts to a ～02 h local sector at low latitudes. The ionospheric response is strongly asymmetric because the wedge area and the TID amplitude are larger in the winter hemisphere than in the summer hemisphere. Clear evidence was obtained indicating that the more powerful TID from the Northern (winter) hemisphere propagated across the equator into the low latitude Southern (summer) hemisphere. Intercosmos-19 observations show that the disturbance covers the entire thickness of the topside ionosphere, from hmF2 up to at least the 1000 km satellite altitude at post-midnight local times. F-layer lifting reached ～200 km, Ne increases in the topside ionosphere by up to a factor of ～1.9 and variations in NmF2 of both signs were observed. Assumptions are made concerning the reason for the IGW effect at high altitudes in the topside ionosphere. The relationship between TID parameters and source characteristics determined from a global network of magnetometers are studied. The role of the dayside cusp in the generation of the TID in the daytime ionosphere is discussed. The magnetospheric electric field effects are distinguished from IGW effects. |
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