Plasma density undulations in the nighttime mid-latitude F-region as observed by CHAMP,KOMPSAT-1, and DMSP F15 |
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| Authors: | Jaeheung Park Hermann Lühr Kyoung Wook Min Jae-Jin Lee |
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| Institution: | 1. Helmholtz Center Potsdam (GFZ), Sect. 2.3, Telegrafenberg, D-14473 Potsdam, Germany;2. Department of Physics, Korea Advanced Institute of Science and Technology (KAIST), Yuseong-gu, Daejeon 305-701, Republic of Korea;3. Solar and Space Weather Research Group, Korea Astronomy and Space Science Institute (KASI), Yuseong-gu, Daejeon 305-348, Republic of Korea;1. Frederick University, 7 Yianni Frederickou Str., Pallouriotissa, 1036 Nicosia, Cyprus;2. Frederick Research Center, 7 Filokyprou Str., Pallouriotissa, 1036 Nicosia, Cyprus;1. German Aerospace Center (DLR), Institute of Communications und Navigation (IKN), Kalkhorstweg 53, D-17235 Neustrelitz, Germany;2. Telespazio VEGA Deutschland GmbH c/o European Space Operations Centre (ESA/ESOC), Robert-Bosch-Straße 5, D-64293 Darmstadt, Germany;3. Center for Atmospheric Research, University of Massachusetts Lowell, Lowell, MA, USA;4. Department of Physics and Astronomy, Dartmouth College, Hanover, NH, USA;5. European Space Operations Centre (ESA/ESOC), Robert-Bosch-Straße 5, D-64293 Darmstadt, Germany;1. IZMIRAN, Kaluzskoe Sh. 4, Troitsk, Moscow 142190, Russia;2. Department of EEE, Hacettepe University, Beytepe, Ankara 06800, Turkey;3. Universitat Politecnica de Catalunya (UPC), Barcelona, Spain;4. Space Research Center, PAS, Warsaw, Poland |
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| Abstract: | We investigate plasma density undulations in the nighttime mid-latitude topside F-region. During solar maximum years the undulations are found at CHAMP, KOMPSAT-1, and DMSP F15 altitudes. The occurrence rate is higher at KOMPSAT-1 than at DMSP F15 altitude. The undulations occur infrequently during equinoxes, and the occurrence peaks are in the Asian/Oceanian (eastern Pacific/American) region during June (December) solstice. At CHAMP altitude the undulations are observed all through the night, and the occurrence rate is anti-correlated with the solar cycle. As all these results are in general agreement with known climatology of MSTIDs, we suggest that the undulations are a topside signature of MSTIDs. The undulations are often but not always accompanied by magnetic signatures indicating the presence of field-aligned current (FAC). The partial lack in correspondence might be due to the ionospheric conductivity variation. The similar distribution is, however, in support of a connection between density undulations and FACs. |
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