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Oxygen Ion Energization by Waves in the High Altitude Cusp and Mantle : Volume 30, Issue 9 (03/09/2012)

By Waara, M.

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Book Id: WPLBN0004002068
Format Type: PDF Article :
File Size: Pages 6
Reproduction Date: 2015

Title: Oxygen Ion Energization by Waves in the High Altitude Cusp and Mantle : Volume 30, Issue 9 (03/09/2012)  
Author: Waara, M.
Volume: Vol. 30, Issue 9
Language: English
Subject: Science, Annales, Geophysicae
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Historic
Publication Date:
2012
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

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Nilsson, H., Slapak, R., André, M., Stenberg, G., & Waara, M. (2012). Oxygen Ion Energization by Waves in the High Altitude Cusp and Mantle : Volume 30, Issue 9 (03/09/2012). Retrieved from http://members.worldlibrary.net/


Description
Description: Swedish Institute of Space Physics, Kiruna, Sweden. We present a comparative study of low frequency electric field spectral densities and temperatures observed by the Cluster spacecraft in the high altitude cusp/mantle region. We compare the relation between the O+ temperature and wave intensity at the oxygen gyrofrequency at each measurement point and find a clear correlation. The trend of the correlation agrees with the predictions by both an asymptotic mean-particle theory and a test-particle approach. The perpendicular to parallel temperature ratio is also consistent with the predictions of the asymptotic mean-particle theory. At times the perpendicular temperature is significantly higher than predicted by the models. A simple study of the evolution of the particle distributions (conics) at these altitudes indicates that enhanced perpendicular temperatures would be observed over many RE after heating ceases. Therefore, sporadic intense heating is the likely explanation for cases with high temperature and comparably low wave activity. We observe waves of sufficient amplitude to explain the highest observed temperatures, while the theory in general overestimates the temperature associated with the highest observed wave activity, indicating that such high wave activity is very sporadic.

Summary
Oxygen ion energization by waves in the high altitude cusp and mantle

Excerpt
Balogh, A., Carr, C. M., Acuña, M. H., Dunlop, M. W., Beek, T. J., Brown, P., Fornacon, K.-H., Georgescu, E., Glassmeier, K.-H., Harris, J., Musmann, G., Oddy, T., and Schwingenschuh, K.: The Cluster Magnetic Field Investigation: overview of in-flight performance and initial results, Ann. Geophys., 19, 1207–1217, doi:10.5194/angeo-19-1207-2001, 2001.; Bouhram, M., Malingre, M., Jasperse, J. R., Dubouloz, N., and Sauvaud, J.-A.: Modeling transverse heating and outflow of ionospheric ions from the dayside cusp/cleft. 2 Applications, Ann. Geophys., 21, 1773–1791, doi:10.5194/angeo-21-1773-2003, 2003.; Chang, T., Crew, G. B., Hershkowitz, N., Jasperse, J. R., and Retterer, J. M.: Transverse acceleration of oxygen ions by electromagnetic ion cyclotron resonance with broad band left-hand polarized waves, Geophys. Res. Lett., 13, 636–639, doi:10.1029/GL013i007p00636, 1986.; Escoubet, C. P., Fehringer, M., and Goldstein, M.: Introduction: The Cluster mission, Ann. Geophys., 19, 1197–1200, doi:10.5194/angeo-19-1197-2001, 2001.; Gustafsson, G., André, M., Carozzi, T., Eriksson, A. I., Fälthammar, C.-G., Grard, R., Holmgren, G., Holtet, J. A., Ivchenko, N., Karlsson, T., Khotyaintsev, Y., Klimov, S., Laakso, H., Lindqvist, P.-A., Lybekk, B., Marklund, G., Mozer, F., Mursula, K., Pedersen, A., Popielawska, B., Savin, S., Stasiewicz, K., Tanskanen, P., Vaivads, A., and Wahlund, J.-E.: First results of electric field and density observations by Cluster EFW based on initial months of operation, Ann. Geophys., 19, 1219–1240, doi:10.5194/angeo-19-1219-2001, 2001.; Jasperse, J. R., Basu, B., Lund, E. J., and Bouhram, M.: Gyrotropic guiding-center fluid theory for the turbulent heating of magnetospheric ions in downward Birkeland current regions. II, Phys. Plasmas, 13, 112902, doi:10.1063/1.2364475, 2006.; Lennartsson, O. W., Collin, H. L., and Peterson, W. K.: Solar wind control of E}arth's {H+ and O+ outflow rates in the 15-eV to 33-keV energy range, J. Geophys. Res., 109, A12212, doi:10.1029/2004JA010690, 2004.; Lindstedt, T., Khotyaintsev, Y. V., Vaivads, A., Andr{é}, M., Nilsson, H., and Waara, M.: Oxygen energization by localized perpendicular electric fields at the cusp boundary, Geophys. Res. Lett., 37, L09103, doi:10.1029/2010GL043117, 2010.; Moore, T. E. and Horwitz, J. L.: Stellar ablation of planetary atmospheres, Rev. Geophys., 45, RG3002, doi:10.1029/2005RG000194, 2007.; Nilsson, H., Waara, M., Arvelius, S., Marghitu, O., Bouhram, M., Hobara, Y., Yamauchi, M., Lundin, R., Rème, H., Sauvaud, J.-A., Dandouras, I., Balogh, A., Kistler, L. M., Klecker, B., Carlson, C. W., Bavassano-Cattaneo, M. B., and Korth, A.: Characteristics of high altitude oxygen ion energization and outflow as observed by Cluster: a statistical study, Ann. Geophys., 24, 1099–1112, doi:10.5194/angeo-24-1099-2006, 2006.; Nilsson, H., Barghouthi, I. A., Slapak, R., and Eriksson, A. I.: Hot and cold ion outflow: observations and implications for numerical models, J. Geophys Res., submitted, 2012.; Retterer, J. M., Chang, T., Crew, G. B., Jasperse, J. R., and Winningham, J. D.: Monte Carlo modeling of ionospheric oxygen ac

 

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