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Origin of low protonâ toâ electron temperature ratio in the Earth’s plasma sheet
dc.contributor.authorGrigorenko, E. E.
dc.contributor.authorKronberg, E. A.
dc.contributor.authorDaly, P. W.
dc.contributor.authorGanushkina, N. Yu.
dc.contributor.authorLavraud, B.
dc.contributor.authorSauvaud, J.‐a.
dc.contributor.authorZelenyi, L. M.
dc.date.accessioned2017-01-06T20:50:14Z
dc.date.available2017-12-01T21:54:12Zen
dc.date.issued2016-10
dc.identifier.citationGrigorenko, E. E.; Kronberg, E. A.; Daly, P. W.; Ganushkina, N. Yu.; Lavraud, B.; Sauvaud, J.‐a. ; Zelenyi, L. M. (2016). "Origin of low protonâ toâ electron temperature ratio in the Earth’s plasma sheet." Journal of Geophysical Research: Space Physics 121(10): 9985-10,004.
dc.identifier.issn2169-9380
dc.identifier.issn2169-9402
dc.identifier.urihttps://hdl.handle.net/2027.42/135062
dc.description.abstractWe study the protonâ toâ electron temperature ratio (Tp/Te) in the plasma sheet (PS) of the Earth’s magnetotail using 5â years of Cluster observations (2001â 2005). The PS intervals are searched within a region defined with â 19â <â Xâ â ¤â â 7â RE and |Y|â <â 15â RE (GSM) under the condition |BX|â â ¤â 10 nT. One hundred sixty PS crossings are identified. We find an average value of <Tp/Te>â ~â 6.0. However, in many PS intervals Tp/Te varies over a wide range from a few units to several tens of units. In 86 PS intervals the Tp/Te decreases below 3.5. Generally, the decreases of Tp/Te are due to some increase of Te while Tp either decreases or remains unchanged. In the majority of these intervals the Tp/Te drops are observed during magnetotail dipolarizations. A superposed epoch analysis applied to these events shows that the minimum value of Tp/Te is observed after the dipolarization onset during the â turbulent phaseâ of dipolarization, when a number of transient BZ pulses are reduced, but the value of BZ is still large and an intensification of wave activity is observed. The Tp/Te drops, and associated increases of Te often coincide either with bursts of broadband electrostatic emissions, which may include electron cyclotron harmonics, or with broadband electromagnetic emission in a frequency range from proton plasma frequency (fpp) up to the electron gyrofrequency (fce). These findings show that the wave activity developing in the current sheet after dipolarization onset may play a role in the additional electron heating and the associated Tp/Te decrease.Key PointsDuring dipolarizations, drops of Tp/Teâ â ¤â 3.5 often coincide with wave bursts in the frequency range f~fceGenerally, the decreases of Tp/Te are due to some increase of Te while Tp either decreases or remains unchangedElectron heating by ECH and EME with fâ â ¤â fce can be an additional mechanism affecting the Tp/Te during dipolarizations
dc.publisherWiley Periodicals, Inc.
dc.subject.othermagnetotail
dc.subject.otherplasma heating
dc.subject.otherplasma Sheet
dc.titleOrigin of low protonâ toâ electron temperature ratio in the Earth’s plasma sheet
dc.typeArticleen_US
dc.rights.robotsIndexNoFollow
dc.subject.hlbsecondlevelAstronomy and Astrophysics
dc.subject.hlbtoplevelScience
dc.description.peerreviewedPeer Reviewed
dc.description.bitstreamurlhttp://deepblue.lib.umich.edu/bitstream/2027.42/135062/1/jgra53043_am.pdf
dc.description.bitstreamurlhttp://deepblue.lib.umich.edu/bitstream/2027.42/135062/2/jgra53043.pdf
dc.identifier.doi10.1002/2016JA022874
dc.identifier.sourceJournal of Geophysical Research: Space Physics
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