Profiles of electron temperature and <I>B</I><sub>z</sub> along Earth's magnetotail
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Published:2013-06-25
Issue:6
Volume:31
Page:1109-1114
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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:
Artemyev A. V.,Petrukovich A. A.,Nakamura R.,Zelenyi L. M.
Abstract
Abstract. We study the electron temperature distribution and the structure of the current sheet along the magnetotail using simultaneous observations from THEMIS spacecraft. We perform a statistical study of 40 crossings of the current sheet when the three spacecraft THB, THC, and THD were distributed along the tail in the vicinity of midnight with coordinates XB &in; [−30 RE, −20 RE], XC &in; [−20 RE, −15 RE], and XD ~ −10 RE. We obtain profiles of the average electron temperature ⟨Te⟩ and the average magnetic field ⟨Bz⟩ along the tail. Electron temperature and ⟨Bz⟩ increase towards the Earth with almost the same rates (i.e., ratio ⟨Te⟩/⟨Bz⟩ &approx; 2 keV/7 nT is approximately constant along the tail). We also use statistics of 102 crossings of the current sheet from THB and THC to estimate dependence of Te and Bz distributions on geomagnetic activity. The ratio ⟨Te ⟩/⟨Bz⟩ depends on geomagnetic activity only slightly. Additionally we demonstrate that anisotropy of the electron temperature ⟨T&parallel;/T⊥⟩ &approx; 1.1 is almost constant along the tail for X &in; [−30 RE, −10 RE].
Funder
European Commission
Publisher
Copernicus GmbH
Subject
Space and Planetary Science,Earth and Planetary Sciences (miscellaneous),Atmospheric Science,Geology,Astronomy and Astrophysics
Reference23 articles.
1. Artemyev, A. V., Baumjohann, W., Petrukovich, A. A., Nakamura, R., Dandouras, I., and Fazakerley, A.: Proton/electron temperature ratio in the magnetotail, Ann. Geophys., 29, 2253–2257, https://doi.org/10.5194/angeo-29-2253-2011, 2011a. 2. Artemyev, A. V., Petrukovich, A. A., Nakamura, R., and Zelenyi, L. M.: Cluster statistics of thin current sheets in the Earth magnetotail: specifics of the dawn flank, proton temperature profiles and electrostatic effects., J. Geophys. Res., 116, A0923, https://doi.org/10.1029/2011JA016801, 2011b. 3. Artemyev, A. V., Zelenyi, L. M., Petrukovich, A. A., and Nakamura, R.: Hot electrons as tracers of large-scale structure of magnetotail current sheets, Geophys. Res. Lett., 38, L14102, https://doi.org/10.1029/2011GL047979, 2011c. 4. Artemyev, A. V., Petrukovich, A. A., Nakamura, R., and Zelenyi, L. M.: Adiabatic electron heating in the magnetotail current sheet: Cluster observations and analytical models., J. Geophys. Res., 117, A06219, https://doi.org/10.1029/2012JA017513, 2012. 5. Asano, Y., Shinohara, I., Retiò, A., Daly, P. W., Kronberg, E. A., Takada, T., Nakamura, R., Khotyaintsev, Y. V., Vaivads, A., Nagai, T., Baumjohann, W., Fazakerley, A. N., Owen, C. J., Miyashita, Y., Lucek, E. A., and ème, H.: Electron acceleration signatures in the magnetotail associated with substorms, J. Geophys. Res., 115, A05215, https://doi.org/10.1029/2009JA014587, 2010.
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