The University of Southampton
University of Southampton Institutional Repository

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

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

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 downstream 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.

0992-7689
1081-1097
Blanco-Cano, Xochitl
f9b77158-e499-4568-961e-ea4defc8fd8a
Battarbee, Markus
48baf4c9-f9dd-44f6-89e5-74775883f66a
Turc, Lucile
5fcf17c5-c395-4008-9cf5-f89068cd73a9
Dimmock, Andrew P.
a1e06bde-3291-4517-bb68-c6d1b8266e38
Kilpua, Emilia K.J.
21ac6c5c-d312-4c52-bed3-f0eb8816e951
Hoilijoki, Sanni
f04ec08e-8b58-4cde-8516-810d8627464d
Ganse, Urs
25d8c4de-5293-4a74-b97b-9072056585e8
Sibeck, David G.
6004631a-1492-4a41-89dd-5296d8e324d2
Cassak, Paul A.
7741c6ca-3f6d-4afa-90a8-0b022b519b6d
Fear, Robert C.
8755b9ed-c7dc-4cbb-ac9b-56235a0431ab
Jarvinen, Riku
786315de-57e0-47b0-9d76-d883aad03eb0
Juusola, Liisa
f5728e97-a0e0-42ee-af6e-244687f35bf9
Pfau-Kempf, Yann
3de39040-e983-4df8-bd86-675073991614
Vainio, Rami
026b571e-f649-4ba2-a265-90c6b45ff401
Palmroth, Minna
8a0f55b3-8eed-43b1-97dc-60b8b26e058d
Blanco-Cano, Xochitl
f9b77158-e499-4568-961e-ea4defc8fd8a
Battarbee, Markus
48baf4c9-f9dd-44f6-89e5-74775883f66a
Turc, Lucile
5fcf17c5-c395-4008-9cf5-f89068cd73a9
Dimmock, Andrew P.
a1e06bde-3291-4517-bb68-c6d1b8266e38
Kilpua, Emilia K.J.
21ac6c5c-d312-4c52-bed3-f0eb8816e951
Hoilijoki, Sanni
f04ec08e-8b58-4cde-8516-810d8627464d
Ganse, Urs
25d8c4de-5293-4a74-b97b-9072056585e8
Sibeck, David G.
6004631a-1492-4a41-89dd-5296d8e324d2
Cassak, Paul A.
7741c6ca-3f6d-4afa-90a8-0b022b519b6d
Fear, Robert C.
8755b9ed-c7dc-4cbb-ac9b-56235a0431ab
Jarvinen, Riku
786315de-57e0-47b0-9d76-d883aad03eb0
Juusola, Liisa
f5728e97-a0e0-42ee-af6e-244687f35bf9
Pfau-Kempf, Yann
3de39040-e983-4df8-bd86-675073991614
Vainio, Rami
026b571e-f649-4ba2-a265-90c6b45ff401
Palmroth, Minna
8a0f55b3-8eed-43b1-97dc-60b8b26e058d

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., Jarvinen, Riku, Juusola, Liisa, Pfau-Kempf, Yann, Vainio, Rami and Palmroth, Minna (2018) Cavitons and spontaneous hot flow anomalies in a hybrid-Vlasov global magnetospheric simulation. Annales Geophysicae, 36 (4), 1081-1097. (doi:10.5194/angeo-36-1081-2018).

Record type: Article

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 downstream 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.

Text
angeo-36-1081-2018 - Version of Record
Available under License Creative Commons Attribution.
Download (8MB)

More information

Accepted/In Press date: 3 July 2018
e-pub ahead of print date: 8 August 2018
Published date: 8 August 2018

Identifiers

Local EPrints ID: 424624
URI: https://eprints.soton.ac.uk/id/eprint/424624
ISSN: 0992-7689
PURE UUID: c4d9b00e-31b9-4d7a-b6de-67729ccd5f65
ORCID for Robert C. Fear: ORCID iD orcid.org/0000-0003-0589-7147

Catalogue record

Date deposited: 05 Oct 2018 11:39
Last modified: 10 Dec 2019 01:34

Export record

Altmetrics

Contributors

Author: Xochitl Blanco-Cano
Author: Markus Battarbee
Author: Lucile Turc
Author: Andrew P. Dimmock
Author: Emilia K.J. Kilpua
Author: Sanni Hoilijoki
Author: Urs Ganse
Author: David G. Sibeck
Author: Paul A. Cassak
Author: Robert C. Fear ORCID iD
Author: Riku Jarvinen
Author: Liisa Juusola
Author: Yann Pfau-Kempf
Author: Rami Vainio
Author: Minna Palmroth

University divisions

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of https://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×