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Cassini encounters with hot flow anomaly-like phenomena at Saturn's bow shock

Cassini encounters with hot flow anomaly-like phenomena at Saturn's bow shock
Cassini encounters with hot flow anomaly-like phenomena at Saturn's bow shock

The first observations of the kronian equivalent of hot flow anomalies (HFAs) are presented. Using magnetic field and plasma data we discuss two events that were observed upstream of Saturn's bow shock during the first two orbits of the Cassini spacecraft. We suggest that these events result from the interaction between interplanetary current sheets and the shock surface. This same interaction is responsible for HFAs at the terrestrial bow shock. Calculations of electron temperature reveal an increase by a factor of approximately two for the first event, which is less than for terrestrial HFAs where the increase is by approximately an order of magnitude. In contrast to terrestrial HFAs we find that these events are associated with density enhancement rather than reduction. Estimates of the total pressure for the first event imply that the central region is expanding.

0094-8276
Masters, Adam
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Arridge, C. S.
2efb7acf-be5b-41b4-bade-8b4ff0d78236
Dougherty, M. K.
aa297043-7e86-4501-952b-a6363edaaba8
Bertucci, C.
138c36a2-12ef-4021-a901-1bf5645155b7
Billingham, L.
88817da1-50c3-4863-8c72-25eabed45d4c
Schwartz, S. J.
6e89ea4b-98a3-4a7d-900e-63dd9a64cd4c
Jackman, C. M.
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Bebesi, Z.
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Coates, A. J.
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Thomsen, M. F.
bc09abeb-5d20-449f-9f54-568fff6d220c
Masters, Adam
b81ac37f-9b45-4c90-a61c-e603fbed255d
Arridge, C. S.
2efb7acf-be5b-41b4-bade-8b4ff0d78236
Dougherty, M. K.
aa297043-7e86-4501-952b-a6363edaaba8
Bertucci, C.
138c36a2-12ef-4021-a901-1bf5645155b7
Billingham, L.
88817da1-50c3-4863-8c72-25eabed45d4c
Schwartz, S. J.
6e89ea4b-98a3-4a7d-900e-63dd9a64cd4c
Jackman, C. M.
9bc3456c-b254-48f1-ade0-912c5b8b4529
Bebesi, Z.
9203f9c7-716a-4203-b4f9-647aede08178
Coates, A. J.
61022799-2e2b-46da-a964-23d9aaebe455
Thomsen, M. F.
bc09abeb-5d20-449f-9f54-568fff6d220c

Masters, Adam, Arridge, C. S., Dougherty, M. K., Bertucci, C., Billingham, L., Schwartz, S. J., Jackman, C. M., Bebesi, Z., Coates, A. J. and Thomsen, M. F. (2008) Cassini encounters with hot flow anomaly-like phenomena at Saturn's bow shock. Geophysical Research Letters, 35 (2), [L02202]. (doi:10.1029/2007GL032371).

Record type: Article

Abstract

The first observations of the kronian equivalent of hot flow anomalies (HFAs) are presented. Using magnetic field and plasma data we discuss two events that were observed upstream of Saturn's bow shock during the first two orbits of the Cassini spacecraft. We suggest that these events result from the interaction between interplanetary current sheets and the shock surface. This same interaction is responsible for HFAs at the terrestrial bow shock. Calculations of electron temperature reveal an increase by a factor of approximately two for the first event, which is less than for terrestrial HFAs where the increase is by approximately an order of magnitude. In contrast to terrestrial HFAs we find that these events are associated with density enhancement rather than reduction. Estimates of the total pressure for the first event imply that the central region is expanding.

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More information

Published date: 28 January 2008

Identifiers

Local EPrints ID: 436563
URI: http://eprints.soton.ac.uk/id/eprint/436563
ISSN: 0094-8276
PURE UUID: 74c68f41-48b3-46a6-9f2c-6612bb1910ea
ORCID for C. M. Jackman: ORCID iD orcid.org/0000-0003-0635-7361

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Date deposited: 13 Dec 2019 17:30
Last modified: 10 Nov 2021 03:35

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Contributors

Author: Adam Masters
Author: C. S. Arridge
Author: M. K. Dougherty
Author: C. Bertucci
Author: L. Billingham
Author: S. J. Schwartz
Author: C. M. Jackman ORCID iD
Author: Z. Bebesi
Author: A. J. Coates
Author: M. F. Thomsen

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