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Cometary Comae-Surface Links

Marschall, R. and Skorov, Y. and Zakharov, V. and Rezac, L. and Gerig, S.B. and Christou, C. and Dadzie, S Kokou and Migliorini, A. and Rinaldi, G. and Agarwal, J and Vincent, Jean-Baptiste and Kappel, David (2020) Cometary Comae-Surface Links. Space Science Reviews, 216 (130). Springer. doi: 10.1007/s11214-020-00744-0. ISSN 0038-6308.

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Official URL: https://link.springer.com/article/10.1007%2Fs11214-020-00744-0

Abstract

A comet is a highly dynamic object, undergoing a permanent state of change. These changes have to be carefully classified and considered according to their intrinsic temporal and spatial scales. The Rosetta mission has, through its contiguous in-situ and remote sensing coverage of comet 67P/Churyumov-Gerasimenko (hereafter 67P) over the time span of August 2014 to September 2016, monitored the emergence, culmination, and winding down of the gas and dust comae. This provided an unprecedented data set and has spurred a large effort to connect in-situ and remote sensing measurements to the surface. In this review, we address our current understanding of cometary activity and the challenges involved when linking comae data to the surface. We give the current state of research by describing what we know about the physical processes involved from the surface to a few tens of kilometres above it with respect to the gas and dust emission from cometary nuclei. Further, we describe how complex multidimensional cometary gas and dust models have developed from the Halley encounter of 1986 to today. This includes the study of inhomogeneous outgassing and determination of the gas and dust production rates. Additionally, the different approaches used and results obtained to link coma data to the surface will be discussed. We discuss forward and inversion models and we describe the limitations of the respective approaches. The current literature suggests that there does not seem to be a single uniform process behind cometary activity. Rather, activity seems to be the consequence of a variety of erosion processes, including the sublimation of both water ice and more volatile material, but possibly also more exotic processes such as fracture and cliff erosion under thermal and mechanical stress, sub-surface heat storage, and a complex interplay of these processes. Seasons and the nucleus shape are key factors for the distribution and temporal evolution of activity and imply that the heliocentric evolution of activity can be highly individual for every comet, and generalisations can be misleading.

Item URL in elib:https://elib.dlr.de/138814/
Document Type:Article
Title:Cometary Comae-Surface Links
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Marschall, R.Southwest Research Institute, 1050 Walnut St, Suite 300, Boulder, CO 80302, USA; International Space Science Institute (ISSI), Hallerstrasse 6, 3012 Bern, SwitzerlandUNSPECIFIED
Skorov, Y.Institut fur Geophysik und extraterrestrische Physik, Universität Braunschweig & Max Planck Institute für Solar System Research GöttingenUNSPECIFIED
Zakharov, V.Istituto di Astrofisica e Planetologia Spaziali, Istituto Nazionale di Astrofisica, Rome, ItalyUNSPECIFIED
Rezac, L.Max-Planck-Institut für SonnensystemforschungUNSPECIFIED
Gerig, S.B.Physikalisches Institut, University of Bern, Sidlerstr. 5, CH-3012 Bern, Switzerland; NCCR PlanetS, Sidlerstrasse 5, 3012 Bern, SwitzerlandUNSPECIFIED
Christou, C.Heriot-Watt University, Institute of Mechanical Process and Energy Engineering, EH14 4AS, Edinburgh, ScotlandUNSPECIFIED
Dadzie, S KokouHeriot-Watt University, Edinburgh, United KingdomUNSPECIFIED
Migliorini, A.INAF-IAPS, Istituto di Astrofisica e Planetologia SpazialiUNSPECIFIED
Rinaldi, G.INAF-IAPS, Rome, ItalyUNSPECIFIED
Agarwal, JMax-Planck-Institut für Sonnensystemforschung, Justus-von-Liebig-Weg 3, 37077 Göttingen, GermanyUNSPECIFIED
Vincent, Jean-BaptisteJean-Baptiste.Vincent (at) dlr.deUNSPECIFIED
Kappel, DavidDavid.Kappel (at) dlr.deUNSPECIFIED
Date:November 2020
Journal or Publication Title:Space Science Reviews
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:216
DOI :10.1007/s11214-020-00744-0
Publisher:Springer
ISSN:0038-6308
Status:Published
Keywords:Comets; Coma; Gas; Dust; Dynamics; Modelling; Inversion
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Exploration
DLR - Research area:Raumfahrt
DLR - Program:R EW - Space Exploration
DLR - Research theme (Project):R - Project ROSETTA Instruments
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Planetary Geodesy
Institute of Planetary Research > Leitungsbereich PF
Deposited By: Vincent, Jean-Baptiste
Deposited On:04 Dec 2020 08:18
Last Modified:20 Jun 2021 15:54

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