Structure and evolution of the diamagnetic cavity at comet 67P/Churyumov–Gerasimenko

Goetz, C.; Koenders, C.; Hansen, K. C.; Burch, J.; Carr, C.; Eriksson, A.; Frühauff, D.; Güttler, C.; Henri, P.; Nilsson, H.; Richter, I.; Rubin, Martin; Sierks, H.; Tsurutani, B.; Volwerk, M.; Glassmeier, K. H. (2016). Structure and evolution of the diamagnetic cavity at comet 67P/Churyumov–Gerasimenko. Monthly notices of the Royal Astronomical Society, 462(Suppl 1), S459-S467. Oxford University Press 10.1093/mnras/stw3148

[img]
Preview
Text
stw3148.pdf - Published Version
Available under License Publisher holds Copyright.

Download (1MB) | Preview

The long duration of the Rosetta mission allows us to study the evolution of the diamagnetic cavity at comet 67P/Churyumov-Gerasimenko in detail. From 2015 April to 2016 February 665 intervals could be identified where Rosetta was located in a zero-magnetic-field region. We study the temporal and spatial distribution of this cavity and its boundary and conclude that the cavity properties depend on the long-term trend of the outgassing rate, but do not respond to transient events at the spacecraft location, such as outbursts or high neutral densities. Using an empirical model of the outgassing rate, we find a functional relationship between the outgassing rate and the distance of the cavity to the nucleus. There is also no indication that this unexpectedly large distance is related to unusual solar wind conditions. Because the deduced shape of the cavity boundary is roughly elliptical on small scales and the distances of the boundary from the nucleus are much larger than expected we conclude that the events observed by Rosetta are due to a moving instability of the cavity boundary itself.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Physics Institute > Space Research and Planetary Sciences

UniBE Contributor:

Rubin, Martin

Subjects:

500 Science > 520 Astronomy
500 Science > 530 Physics
600 Technology > 620 Engineering

ISSN:

0035-8711

Publisher:

Oxford University Press

Language:

English

Submitter:

Katharina Weyeneth-Moser

Date Deposited:

06 Jul 2017 11:09

Last Modified:

06 Jul 2017 11:09

Publisher DOI:

10.1093/mnras/stw3148

BORIS DOI:

10.7892/boris.97001

URI:

https://boris.unibe.ch/id/eprint/97001

Actions (login required)

Edit item Edit item
Provide Feedback