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Low-frequency Magnetic Field Fluctuations in Earth's Plasma Environment Observed by Themis : Volume 30, Issue 8 (27/08/2012)

By Guicking, L.

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Book Id: WPLBN0004002065
Format Type: PDF Article :
File Size: Pages 13
Reproduction Date: 2015

Title: Low-frequency Magnetic Field Fluctuations in Earth's Plasma Environment Observed by Themis : Volume 30, Issue 8 (27/08/2012)  
Author: Guicking, L.
Volume: Vol. 30, Issue 8
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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Narita, Y., Auster, H., Kleindienst, G., Glassmeier, K., & Guicking, L. (2012). Low-frequency Magnetic Field Fluctuations in Earth's Plasma Environment Observed by Themis : Volume 30, Issue 8 (27/08/2012). Retrieved from http://www.ebooklibrary.org/


Description
Description: Institut für Geophysik und extraterrestrische Physik, Technische Universität Braunschweig, Mendelssohnstrasse 3, 38106 Braunschweig, Germany. Low-frequency magnetic wave activity in Earth's plasma environment was determined based on a statistical analysis of THEMIS magnetic field data. We observe that the spatial distribution of low-frequency magnetic field fluctuations reveals highest values in the magnetosheath, but the observations differ qualitatively from observations at Venus presented in a previous study since significant wave activity at Earth is also observed in the nightside magnetosheath. Outside the magnetosheath the low-frequency wave activity level is generally very low. By means of an analytical streamline model for the magnetosheath plasma flow, we are able to investigate the spatial and temporal evolution of wave intensity along particular streamlines in order to characterise possible wave generation mechanisms. We observe a decay of wave intensity along the streamlines, but contrary to the situation at Venus, we obtain good qualitative agreement with the theoretical concept of freely evolving/decaying turbulence. Differences between the dawn region and the dusk region can be observed only further away from the magnetopause. We conclude that wave generation mechanisms may be primarily attributed to processes at or in the vicinity of the bow shock. The difference with the observations of the Venusian magnetosheath we interpret to be the result of the different types of solar wind interaction processes since the Earth possesses a global magnetic field while Venus does not, and therefore the observed magnetic wave activities may be caused by diverse magnetic field controlled characteristics of wave generation processes.

Summary
Low-frequency magnetic field fluctuations in Earth's plasma environment observed by THEMIS

Excerpt
Guicking, L.: Niederfrequente Magnetfeldfluktuationen in der Plasmaumgebung der Venus, Ph.D. thesis, Technische Universit{ä}t Braunschweig, 2011.; Anderson, B. J., Fuselier, S. A., Gary, S. P., and Denton, R. E.: Magnetic spectral signatures in the Earth's magnetosheath and plasma depletion layer, J. Geophys. Res., 99, 5877–5891, doi:10.1029/93JA02827, 1994.; Angelopoulos, V.: The THEMIS Mission, Space Sci. Rev., 141, 5–34, doi:10.1007/s11214-008-9336-1, 2008.; Angelopoulos, V.: The ARTEMIS Mission, Space Sci. Rev., 165, 3–25, doi:10.1007/s11214-010-9687-2, 2011.; Auster, H.-U., Glassmeier, K.-H., Magnes, W., Aydogar, O., Baumjohann, W., Constantinescu, D., Fischer, D., Fornaçon, K.-H., Georgescu, E., Harvey, P., Hillenmaier, O., Kroth, R., Ludlam, M., Narita, Y., Nakamura, R., Okrafka, K., Plaschke, F., Richter, I., Schwarzl, H., Stoll, B., Valavanoglou, A., and Wiedemann, M.: The THEMIS Fluxgate Magnetometer, Space Sci. Rev., 141, 235–264, doi:10.1007/s11214-008-9365-9, 2008.; Biskamp, D.: Magnetohydrodynamic Turbulence, Cambridge Univ. Press, Cambridge, 2003.; Davidson, P. A.: Turbulence: An introduction for scientists and engineers, Oxford Univ. Press, New York, 2004.; Denton, R. E., Lessard, M. R., LaBelle, J. W., and Gary, S. P.: Identification of low-frequency magnetosheath waves, J. Geophys. Res., 103, 23661–23676, doi:10.1029/98JA02196, 1998.; Du, J., Zhang, T. L., Baumjohann, W., Wang, C., Volwerk, M., Vörös, Z., and Guicking, L.: Statistical study of low-frequency magnetic field fluctuations near Venus under the different interplanetary magnetic field orientations, J. Geophys. Res., 115, A12251, doi:10.1029/2010JA015549, 2010.; 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.; Espley, J. R., Cloutier, P. A., Brain, D. A., Crider, D. H., and Acuña, M. H.: Observations of low-frequency magnetic oscillations in the Martian magnetosheath, magnetic pileup region, and tail, J. Geophys. Res., 109, A07213, doi:10.1029/2003JA010193, 2004.; Frey, S., Angelopoulos, V., Bester, M., Bonnell, J., Phan, T., and Rummel, D.: Orbit Design for the THEMIS Mission, Space Sci. Rev., 141, 61–89, doi:10.1007/s11214-008-9441-1, 2008.; Gary, S. P.: Theory of Space Plasma Microinstabilities, Cambridge atmospheric and space science series, Cambridge Univ. Press, New York, 1993.; Gary, S. P.: Electromagnetic ion/ion instabilities and their consequences in space plasmas: A review, Space Sci. Rev., 56, 373–415, doi:10.1007/BF00196632, 1991.; Gary, S. P., Fuselier, S. A., and Anderson, B. J.: Ion anisotropy instabilities in the magnetosheath, J. Geophys. Res., 98, 1481–1488, doi:10.1029/92JA01844, 1993.; Génot, V., Broussillou, L., Budnik, E., Hellinger, P., Trávníček, P. M., Lucek, E., and Dandouras, I.: Timing mirror structures observed by Cluster with a magnetosheath flow model, Ann. Geophys., 29, 1849–1860, doi:10.5194/angeo-29-1849-2011, 2011.; Guicking, L., Glassmeier, K.-H., Auster, H.-U., Delva, M., Motschmann, U., Narita, Y., and Zhang, T. L.: Low-f

 

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