Pc2-3 geomagnetic pulsations on the ground, in the ionosphere, and in the magnetosphere: MM100, CHAMP, and THEMIS observations
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Published:2015-01-28
Issue:1
Volume:33
Page:117-128
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ISSN:1432-0576
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Container-title:Annales Geophysicae
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language:en
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Short-container-title:Ann. Geophys.
Author:
Yagova N., Heilig B.ORCID, Fedorov E.
Abstract
Abstract. We analyze Pc2-3 pulsations recorded by the CHAMP (CHAllenging Minisatellite Payload) satellite in the F layer of the Earth's ionosphere, on the ground, and in the magnetosphere during quiet geomagnetic conditions. The spectra of Pc2-3 pulsations recorded in the F layer are enriched with frequencies above 50 mHz in comparison to the ground Pc2-3 spectra. These frequencies are higher than the fundamental harmonics of the field line resonances in the magnetosphere. High quality signals with dominant frequencies 70–200 mHz are a regular phenomenon in the F layer and in the magnetosphere. The mean latitude of the maximum Pc2-3 occurrence rate lies at L ≈ 3.5 in the F layer, i.e., inside the plasmasphere. Day-to-day variations of the L value of the CHAMP Pc2-3 occurrence rate maximum follow the plasmapause day-to-day variations. Polarization and amplitude of Pc2-3s in the magnetosphere, in the ionosphere, and on the ground allow us to suggest that they are generated as fast magnetosonic (FMS) waves in the outer magnetosphere and are partly converted into shear Alfven waves near the plasmapause. The observed ground-to-ionosphere amplitude ratio during the night is interpreted as a result of the Alfven wave transmission through the ionosphere. The problem of wave transmission through the ionosphere is solved theoretically by means of a numerical solution of the full-wave equation for the Alfven wave reflection from and transmission through a horizontally stratified ionosphere. The best agreement between the calculated and measured values of the ground-to-ionosphere amplitude ratio is found for k = 5 × 10−3 km−1, i.e., the observed ground-to-ionosphere amplitude ratio corresponds to a wave spatial scale which could provide a Doppler shift within a few percent of the apparent frequency of the Pc2-3 pulsations as recorded by a low-orbiting spacecraft.
Publisher
Copernicus GmbH
Subject
Space and Planetary Science,Earth and Planetary Sciences (miscellaneous),Atmospheric Science,Geology,Astronomy and Astrophysics
Reference34 articles.
1. Alperovich, L. and Fedorov, E.: The satellite electromagnetic sounding of the Earth, Adv. Space Res., 13, 23–32, https://doi.org/10.1016/0273-1177(93)90198-K, 1993. 2. Alperovich, L. S. and Fedorov, E. N.: Hydromagnetic Waves in the Magnetosphere and the Ionosphere. Series: Astrophysics and Space Science Library, Vol. 353, 2009, XXIV, 418 pp., Hardcover, ISBN: 978-1-4020-6636-8, 2007. 3. Balasis, G., Daglis, I. A., Zesta, E., Papadimitriou, C., Georgiou, M., Haagmans, R., and Tsinganos, K.: ULF wave activity during the 2003 Halloween superstorm: multipoint observations from CHAMP, Cluster and Geotail missions, Ann. Geophys., 30, 1751–1768, https://doi.org/10.5194/angeo-30-1751-2012, 2012. 4. Balasis, G., Daglis, I. A., Georgiou, M., Papadimitriou, C., and Haagmans, R.: Magnetospheric ULF wave studies in the frame of Swarm mission: a time-frequency analysis tool for automated detection of pulsations in magnetic and electric field observations, Earth Planets Space, 65, 1385–1398, 2013. 5. Bering III, E. A., Benbrook, J. R., Engebretson, M. J., and Arnoldy, R. L.: Simultaneous electric and magnetic field observations of Pc1-2, and Pc3 pulsations, J. Geophys. Res., 103, 6741–6761, https://doi.org/10.1029/97JA03327, 1998.
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