Cavitons and spontaneous hot flow anomalies in a hybrid-Vlasov global magnetospheric simulation

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Blanco-Cano , X , Battarbee , M , Turc , L , Dimmock , A P , Kilpua , E K J , Hoilijoki , S , Ganse , U , Sibeck , D G , Cassak , P A , Fear , R C , Järvinen , R , Juusola , L , Pfau-Kempf , Y , Vainio , R & Palmroth , M 2018 , ' Cavitons and spontaneous hot flow anomalies in a hybrid-Vlasov global magnetospheric simulation ' , Annales Geophysicae , vol. 36 , no. 4 , pp. 1081-1097 . https://doi.org/10.5194/angeo-36-1081-2018

Title: Cavitons and spontaneous hot flow anomalies in a hybrid-Vlasov global magnetospheric simulation
Author: Blanco-Cano, Xochitl; Battarbee, Markus; Turc, Lucile; Dimmock, Andrew P.; Kilpua, Emilia K. J.; Hoilijoki, Sanni; Ganse, Urs; Sibeck, David G.; Cassak, Paul A.; Fear, Robert C.; Järvinen, Riku; Juusola, Liisa; Pfau-Kempf, Yann; Vainio, Rami; Palmroth, Minna
Other contributor: University of Helsinki, Department of Physics
University of Helsinki, Department of Physics
University of Helsinki, Department of Physics
University of Helsinki, Department of Physics
University of Helsinki, Department of Physics
University of Helsinki, Department of Physics
University of Helsinki, Department of Physics

Date: 2018-08-08
Language: eng
Number of pages: 17
Belongs to series: Annales Geophysicae
ISSN: 0992-7689
DOI: https://doi.org/10.5194/angeo-36-1081-2018
URI: http://hdl.handle.net/10138/239094
Abstract: In this paper we present the first identification of foreshock cavitons and the formation of spontaneous hot flow anomalies (SHFAs) with the Vlasiator global magnetospheric hybrid-Vlasov simulation code. In agreement with previous studies we show that cavitons evolve into SHFAs. In the presented run, this occurs very near the bow shock. We report on SHFAs surviving the shock crossing into the down-stream region and show that the interaction of SHFAs with the bow shock can lead to the formation of a magnetosheath cavity, previously identified in observations and simulations. We report on the first identification of long-term local weakening and erosion of the bow shock, associated with a region of increased foreshock SHFA and caviton formation, and repeated shock crossings by them. We show that SHFAs are linked to an increase in suprathermal particle pitch-angle spreads. The realistic length scales in our simulation allow us to present a statistical study of global caviton and SHFA size distributions, and their comparable size distributions support the theory that SHFAs are formed from cavitons. Virtual spacecraft observations are shown to be in good agreement with observational studies.
Subject: QUASI-PARALLEL SHOCKS
EARTHS BOW SHOCK
THEMIS OBSERVATIONS
FORESHOCK CAVITONS
ION DISTRIBUTIONS
ULF FORESHOCK
SOLAR-WIND
MAGNETOSHEATH
WAVES
UPSTREAM
115 Astronomy, Space science
114 Physical sciences
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