Ultraviolet observations of the hydrogen coma of comet C/2013 A1 (Siding Spring) by MAVEN/IUVS

Matteo M.J. Crismani; Nicholas M. Schneider; Justin I. Deighan; A. Ian F. Stewart; Michael Combi; Michael S. Chaffin; Nicolas Fougere; Sonal K. Jain; Arnaud Stiepen; Roger V. Yelle; William E. McClintock; John T. Clarke; Gregory M. Holsclaw; Frank Montmessin; Bruce M. Jakosky

doi:10.1002/2015GL065290

Ultraviolet observations of the hydrogen coma of comet C/2013 A1 (Siding Spring) by MAVEN/IUVS

Matteo M.J. Crismani, Nicholas M. Schneider, Justin I. Deighan, A. Ian F. Stewart, Michael Combi, Michael S. Chaffin, Nicolas Fougere, Sonal K. Jain, Arnaud Stiepen, Roger V. Yelle, William E. McClintock, John T. Clarke, Gregory M. Holsclaw, Frank Montmessin, Bruce M. Jakosky

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11 Scopus citations

Abstract

We used the Imaging Ultraviolet Spectrograph (IUVS) aboard the Mars Atmosphere and Volatile EvolutioN (MAVEN) orbiting spacecraft to construct images of the hydrogen coma of comet C/2013 A1 (Siding Spring) days before its close encounter with Mars. We obtain a water production rate of 1.1 ± 0.5 × 10²⁸ molecules/s and determine the total impacting fluence of atoms and molecules corresponding to the photodissociation of water and its daughter species to be 2.4 ± 1.2 × 10⁴ kg. We use these observations to confirm predictions that the mass of delivered hydrogen is comparable to the existing reservoir above 150 km. Furthermore, we reconcile disparity between observations and predictions about the detectability of the hydrogen perturbation and thermospheric response.

Original language	English (US)
Pages (from-to)	8803-8809
Number of pages	7
Journal	Geophysical Research Letters
Volume	42
Issue number	21
DOIs	https://doi.org/10.1002/2015GL065290
State	Published - Nov 16 2015

Keywords

Comet Siding Spring
Mars upper atmosphere

ASJC Scopus subject areas

Geophysics
General Earth and Planetary Sciences

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10.1002/2015GL065290

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Crismani, M. M. J., Schneider, N. M., Deighan, J. I., Stewart, A. I. F., Combi, M., Chaffin, M. S., Fougere, N., Jain, S. K., Stiepen, A., Yelle, R. V., McClintock, W. E., Clarke, J. T., Holsclaw, G. M., Montmessin, F., & Jakosky, B. M. (2015). Ultraviolet observations of the hydrogen coma of comet C/2013 A1 (Siding Spring) by MAVEN/IUVS. Geophysical Research Letters, 42(21), 8803-8809. https://doi.org/10.1002/2015GL065290

Crismani, MMJ, Schneider, NM, Deighan, JI, Stewart, AIF, Combi, M, Chaffin, MS, Fougere, N, Jain, SK, Stiepen, A, Yelle, RV, McClintock, WE, Clarke, JT, Holsclaw, GM, Montmessin, F & Jakosky, BM 2015, 'Ultraviolet observations of the hydrogen coma of comet C/2013 A1 (Siding Spring) by MAVEN/IUVS', Geophysical Research Letters, vol. 42, no. 21, pp. 8803-8809. https://doi.org/10.1002/2015GL065290

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title = "Ultraviolet observations of the hydrogen coma of comet C/2013 A1 (Siding Spring) by MAVEN/IUVS",

abstract = "We used the Imaging Ultraviolet Spectrograph (IUVS) aboard the Mars Atmosphere and Volatile EvolutioN (MAVEN) orbiting spacecraft to construct images of the hydrogen coma of comet C/2013 A1 (Siding Spring) days before its close encounter with Mars. We obtain a water production rate of 1.1 ± 0.5 × 1028 molecules/s and determine the total impacting fluence of atoms and molecules corresponding to the photodissociation of water and its daughter species to be 2.4 ± 1.2 × 104 kg. We use these observations to confirm predictions that the mass of delivered hydrogen is comparable to the existing reservoir above 150 km. Furthermore, we reconcile disparity between observations and predictions about the detectability of the hydrogen perturbation and thermospheric response.",

keywords = "Comet Siding Spring, Mars upper atmosphere",

author = "Crismani, {Matteo M.J.} and Schneider, {Nicholas M.} and Deighan, {Justin I.} and Stewart, {A. Ian F.} and Michael Combi and Chaffin, {Michael S.} and Nicolas Fougere and Jain, {Sonal K.} and Arnaud Stiepen and Yelle, {Roger V.} and McClintock, {William E.} and Clarke, {John T.} and Holsclaw, {Gregory M.} and Frank Montmessin and Jakosky, {Bruce M.}",

year = "2015",

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doi = "10.1002/2015GL065290",

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AU - Crismani, Matteo M.J.

AU - Schneider, Nicholas M.

AU - Deighan, Justin I.

AU - Stewart, A. Ian F.

AU - Combi, Michael

AU - Chaffin, Michael S.

AU - Fougere, Nicolas

AU - Jain, Sonal K.

AU - Stiepen, Arnaud

AU - Yelle, Roger V.

AU - McClintock, William E.

AU - Clarke, John T.

AU - Holsclaw, Gregory M.

AU - Montmessin, Frank

AU - Jakosky, Bruce M.

PY - 2015/11/16

Y1 - 2015/11/16

N2 - We used the Imaging Ultraviolet Spectrograph (IUVS) aboard the Mars Atmosphere and Volatile EvolutioN (MAVEN) orbiting spacecraft to construct images of the hydrogen coma of comet C/2013 A1 (Siding Spring) days before its close encounter with Mars. We obtain a water production rate of 1.1 ± 0.5 × 1028 molecules/s and determine the total impacting fluence of atoms and molecules corresponding to the photodissociation of water and its daughter species to be 2.4 ± 1.2 × 104 kg. We use these observations to confirm predictions that the mass of delivered hydrogen is comparable to the existing reservoir above 150 km. Furthermore, we reconcile disparity between observations and predictions about the detectability of the hydrogen perturbation and thermospheric response.

AB - We used the Imaging Ultraviolet Spectrograph (IUVS) aboard the Mars Atmosphere and Volatile EvolutioN (MAVEN) orbiting spacecraft to construct images of the hydrogen coma of comet C/2013 A1 (Siding Spring) days before its close encounter with Mars. We obtain a water production rate of 1.1 ± 0.5 × 1028 molecules/s and determine the total impacting fluence of atoms and molecules corresponding to the photodissociation of water and its daughter species to be 2.4 ± 1.2 × 104 kg. We use these observations to confirm predictions that the mass of delivered hydrogen is comparable to the existing reservoir above 150 km. Furthermore, we reconcile disparity between observations and predictions about the detectability of the hydrogen perturbation and thermospheric response.

KW - Comet Siding Spring

KW - Mars upper atmosphere

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Ultraviolet observations of the hydrogen coma of comet C/2013 A1 (Siding Spring) by MAVEN/IUVS

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