Temperature variations in the dayside magnetosheath and their dependence on ion-scale magnetic structures : THEMIS statistics and measurements by MMS

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Dimmock , A P , Osmane , A , Pulkkinen , T I , Nykyri , K & Kilpua , E 2017 , ' Temperature variations in the dayside magnetosheath and their dependence on ion-scale magnetic structures : THEMIS statistics and measurements by MMS ' , Journal of geophysical research. Space physics , vol. 122 , no. 6 , pp. 6165-6184 . https://doi.org/10.1002/2016JA023729

Title: Temperature variations in the dayside magnetosheath and their dependence on ion-scale magnetic structures : THEMIS statistics and measurements by MMS
Author: Dimmock, A. P.; Osmane, A.; Pulkkinen, T. I.; Nykyri, K.; Kilpua, E.
Contributor: University of Helsinki, Department of Physics
Date: 2017-06
Language: eng
Number of pages: 20
Belongs to series: Journal of geophysical research. Space physics
ISSN: 2169-9380
URI: http://hdl.handle.net/10138/308090
Abstract: The magnetosheath contains an array of waves, instabilities, and nonlinear magnetic structures which modify global plasma properties by means of various wave-particle interactions. The present work demonstrates that ion-scale magnetic field structures (similar to 0.2-0.5 Hz) observed in the dayside magnetosheath are statistically correlated to ion temperature changes on orders 10-20% of the background value. In addition, our statistical analysis implies that larger temperature changes are in equipartition to larger amplitude magnetic structures. This effect was more pronounced behind the quasi-parallel bow shock and during faster solar wind speeds. The study of two separate intervals suggests that this effect can result from both local and external drivers. This manuscript presents two separate case studies, one from using THEMIS (Time History of Events and Macroscale Interactions during Substorms) data and another from Magnetospheric Multiscale; these measurements are then supported by extensive THEMIS statistical observations. These results could partly explain the 10-20% dawn-favored asymmetry of the magnetosheath ion temperature seed population and contribute to the dawn-favored asymmetry of cold component ions in the cold dense plasma sheet.
Subject: magnetosheath
wave-particle interaction
dawn-dusk asymmetry
ion heating
nonadiabatic heating
KINETIC ALFVEN WAVES
QUASI-PARALLEL SHOCKS
MEDIUM REFERENCE FRAME
DAWN-DUSK ASYMMETRIES
TERRESTRIAL BOW SHOCK
SOLAR-WIND
COLLISIONLESS SHOCK
EARTHS MAGNETOSHEATH
CLUSTER OBSERVATIONS
PLASMA TRANSPORT
115 Astronomy, Space science
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