Field-aligned and field-perpendicular velocities in the ionospheric F2-layer |
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| Affiliation: | 1. State Transport University, 9 Moskovsky Av, Saint Petersburg 190031, Russia;2. Geophysical Center of the Russian Academy of Science, 3 Molodezhnaya Str, Moscow 119296, Russia;3. Space Research Institute of the Russian Academy of Science, 84/32 Profsoyuznaya Str, Moscow 117997, Russia;1. Department of Aerospace Engineering Sciences, University of Colorado Boulder, Boulder, CO, USA;2. Institute of Space Science, National Central University, Taoyuan City, Taiwan;3. High Altitude Observatory, National Center for Atmospheric Research, Boulder, CO, USA;4. Department of Earth Sciences, National Cheng Kung University, Tainan, Taiwan;5. Atmospheric and Planetary Sciences, Hampton University, Hampton, VA, USA;6. ESSIC, University of Maryland, College Park, MD, USA;1. NASA Goddard Space Flight Center, ITM Physics Laboratory, Greenbelt, MD 20771, USA;2. Utah State University, Logan, UT 84322, USA;3. Boston University, Boston, MA 02215, USA;4. Naval Research Laboratory, Washington, DC 20375, USA;5. Space@VT, Virginia Tech, Blacksburg, VA 24061, USA;6. The Catholic University of America, Washington, DC, 20064, USA;7. NASA Goddard Space Flight Center, Heliophysics Science Division, Greenbelt, MD 20771, USA;1. Japan Meteorological Agency, 1-3-4 Otemachi, Chiyoda-ku, Tokyo 100-8122, Japan;2. Météo-France Centre de Météorologie Marine, 13 rue du Chatellier, CS 12804, 29228 Brest Cedex 2, France;3. Met Office Hadley Centre, FitzRoy Road, Exeter EX1 3PB, UK;4. European Organisation for the Exploitation of Meteorological Satellites, Eumetsat Allee 1, D-64295 Darmstadt, Germany |
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| Abstract: | Incoherent scatter observations have shown that there is sometimes a detailed anticorrelation or ‘mirroring’ between V∥ and V⊥, the components of F2-layer plasma velocity parallel to and perpendicular to the geomagnetic field. In this paper we develop a simple theoretical model of the F2-layer and compute its response to applied perturbations of V⊥, both steplike and oscillatory; in particular we investigate the phase and amplitude relationships between V∥ and V⊥ resulting from ion-drag and plasma diffusion. For periods of a few hours, the oscillations of V∥ lag behind exact anticorrelation with V⊥ by 0.1–0.2 cycle, but the time lags corresponding to these phase differences are only a fraction of 1 h and seem broadly compatible with observations previously reported from Arecibo and Malvern. We do not study the question of what causes the velocities to fluctuate in the first place. |
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