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Energy transport during O+ energization by ELF waves observed by the Freja satellite
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1999 (English)In: Journal of Geophysical Research A: Space Physics, ISSN 01480227 (ISSN), Vol. 104, no A2, 2563-2572 p.Article in journal (Refereed) Published
Abstract [en]

We present a study of strong ELF waves correlated with O+ ion heating. We investigate the kinetic energy flux of oxygen ions and electrons parallel to the ambient magnetic field and the Poynting flux along the magnetic field of waves in different frequency regions. We show that the Poynting flux of lower hybrid waves and waves with frequencies below the oxygen gyrofrequency is downward but much less than the upgoing oxygen ion energy flux. The Poynting flux of ELF waves with frequencies at about half the local proton gyrofrequency is also downward, and it is comparable to, or larger, than the upward oxygen energy flux. Our results are consistent with a scenario where ELF waves with frequencies around half the proton gyrofrequency are generated above the satellite and transfer energy to oxygen ions in a region below the satellite. Copyright 1999 by the American Geophysical Union.

Place, publisher, year, edition, pages
1999. Vol. 104, no A2, 2563-2572 p.
National Category
Fusion, Plasma and Space Physics
URN: urn:nbn:se:kth:diva-91718OAI: diva2:511091
References: André, M., Norqvist, P., Andersson, L., Eliasson, L., Eriksson, A.I., Blomberg, L., Erlandson, R.E., Waldemark, J., Ion energization mechanisms at 1700 kilometer in the auroral region (1998) J. Geophys. Res., 103, p. 4199; Decyk, V.K., Wave-particle diagnostics for plasma simulation (1985) Space Sci. Rev., 42, p. 113; Erlandson, R.E., Zanetti, L.J., A statistical study of auroral electromagnetic ion cyclotron waves (1998) J. Geophys. Res., 103, p. 4627; Erlandson, R.E., Zanetti, L.J., Acuna, M.H., Eriksson, A.I., Eliasson, L., Boehm, M.H., Blomberg, L.G., Freja observations of electromagnetic ion cyclotron ELF waves and transverse oxygen ion acceleration on auroral field lines (1994) Geophys. Res. Lett., 21 (17), p. 1855; Gurnett, D.A., Frank, L.A., ELF noise bands associated with auroral electron precipitation (1972) J. Geophys. Res., 77, p. 3411; Gustafsson, G., Andre, M., Matson, L., Koskinen, H., On waves below the local proton gyrofrequency in auroral acceleration regions (1990) J. Geophys. Res., 95, p. 5889; Kelley, M.C., Knudsen, D.J., Vickrey, J.F., Poynting flux measurements on a satellite - A diagnostic tool for space research (1991) J. Geophys. Res., 96, p. 201; Lund, E.J., LaBelle, J., On the generation and propagation of auroral electromagnetic ion cyclotron waves (1997) J. Geophys. Res., 102, p. 17241; Mosier, S.R., Gurnett, D.A., VLF measurements of the Poynting flux along the geomagnetic field with the Injun 5 satellite (1969) J. Geophys. Res., 74, p. 5675; Norqvist, P., André, M., Tyrland, M., A statistical study of ion energization mechanisms in the auroral region (1998) J. Geophys. Res., 103, p. 23459; Waldemark, J., Norqvist, P., In-flight calibration of - Satellite ion composition data using artificial intelligence - -methods (1995) IRF Sc. Rep., 226 NR 20140805Available from: 2012-03-20 Created: 2012-03-20 Last updated: 2012-03-20Bibliographically approved

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