First ENA observations at Mars: ENA emissions from the martian upper atmosphere

Y. Futaana; S. Barabash; A. Grigoriev; M. Holmström; E. Kallio; P. C. Brandt; H. Gunell; K. Brinkfeldt; R. Lundin; H. Andersson; M. Yamauchi; S. McKenna-Lawler; J. D. Winningham; R. A. Frahm; J. R. Sharber; J. R. Scherrer; A. J. Coates; D. R. Linder; D. O. Kataria; T. Säles; P. Riihelä; W. Schmidt; H. Koskinen; J. Kozyra; J. Luhmann; E. Roelof; D. Williams; S. Livi; C. C. Curtis; K. C. Hsieh; B. R. Sandel; M. Grande; M. Carter; J. A. Sauvaud; A. Fedorov; J. J. Thocaven; S. Orsini; R. Cerulli-Irelli; M. Maggi; P. Wurz; P. Bochsler; A. Galli; N. Krupp; J. Woch; M. Fränz; K. Asamura; C. Dierker

doi:10.1016/j.icarus.2005.09.019

First ENA observations at Mars: ENA emissions from the martian upper atmosphere

Y. Futaana^*, S. Barabash, A. Grigoriev, M. Holmström, E. Kallio, P. C. Brandt, H. Gunell, K. Brinkfeldt, R. Lundin, H. Andersson, M. Yamauchi, S. McKenna-Lawler, J. D. Winningham, R. A. Frahm, J. R. Sharber, J. R. Scherrer, A. J. Coates, D. R. Linder, D. O. Kataria, T. SälesP. Riihelä, W. Schmidt, H. Koskinen, J. Kozyra, J. Luhmann, E. Roelof, D. Williams, S. Livi, C. C. Curtis, K. C. Hsieh, B. R. Sandel, M. Grande, M. Carter, J. A. Sauvaud, A. Fedorov, J. J. Thocaven, S. Orsini, R. Cerulli-Irelli, M. Maggi, P. Wurz, P. Bochsler, A. Galli, N. Krupp, J. Woch, M. Fränz, K. Asamura, C. Dierker

^*Corresponding author for this work

Department of Physics

Research output: Contribution to journal › Article › peer-review

52 Citations (Scopus)

Abstract

The neutral particle detector (NPD) on board Mars Express has observed energetic neutral atoms (ENAs) from a broad region on the dayside of the martian upper atmosphere. We show one such example for which the observation was conducted at an altitude of 570 km, just above the induced magnetosphere boundary (IMB). The time of flight spectra of these ENAs show that they had energies of 0.2-2 keV/amu, with an average energy of ∼1.1 keV/amu. Both the spatial distribution and the energy of these ENAs are consistent with the backscattered ENAs, produced by an ENA albedo process. This is the first observation of backscattered ENAs from the martian upper atmosphere. The origin of these ENAs is considered to be the solar wind ENAs that are scattered back by collision processes in the martian upper atmosphere. The particle flux and energy flux of the backscattered ENAs are 0.9 - 1.3 × 10⁷ cm^-2 s^-1 and ∼ 9.5 × 10⁹ eV cm^-2 s^-1, respectively.

Original language	English
Pages (from-to)	424-430
Number of pages	7
Journal	Icarus
Volume	182
Issue number	2
DOIs	https://doi.org/10.1016/j.icarus.2005.09.019
Publication status	Published - Jun 2006

Keywords

atmosphere
Atmospheres
dynamics
Ionospheres
Mars
Solar wind
structure

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Futaana, Y., Barabash, S., Grigoriev, A., Holmström, M., Kallio, E., Brandt, P. C., Gunell, H., Brinkfeldt, K., Lundin, R., Andersson, H., Yamauchi, M., McKenna-Lawler, S., Winningham, J. D., Frahm, R. A., Sharber, J. R., Scherrer, J. R., Coates, A. J., Linder, D. R., Kataria, D. O., ... Dierker, C. (2006). First ENA observations at Mars: ENA emissions from the martian upper atmosphere. Icarus, 182(2), 424-430. https://doi.org/10.1016/j.icarus.2005.09.019

@article{820331ad68244b80883db2b21a4d22fb,

title = "First ENA observations at Mars: ENA emissions from the martian upper atmosphere",

abstract = "The neutral particle detector (NPD) on board Mars Express has observed energetic neutral atoms (ENAs) from a broad region on the dayside of the martian upper atmosphere. We show one such example for which the observation was conducted at an altitude of 570 km, just above the induced magnetosphere boundary (IMB). The time of flight spectra of these ENAs show that they had energies of 0.2-2 keV/amu, with an average energy of ∼1.1 keV/amu. Both the spatial distribution and the energy of these ENAs are consistent with the backscattered ENAs, produced by an ENA albedo process. This is the first observation of backscattered ENAs from the martian upper atmosphere. The origin of these ENAs is considered to be the solar wind ENAs that are scattered back by collision processes in the martian upper atmosphere. The particle flux and energy flux of the backscattered ENAs are 0.9 - 1.3 × 107 cm-2 s-1 and ∼ 9.5 × 109 eV cm-2 s-1, respectively.",

keywords = "atmosphere, Atmospheres, dynamics, Ionospheres, Mars, Solar wind, structure",

author = "Y. Futaana and S. Barabash and A. Grigoriev and M. Holmstr{\"o}m and E. Kallio and Brandt, {P. C.} and H. Gunell and K. Brinkfeldt and R. Lundin and H. Andersson and M. Yamauchi and S. McKenna-Lawler and Winningham, {J. D.} and Frahm, {R. A.} and Sharber, {J. R.} and Scherrer, {J. R.} and Coates, {A. J.} and Linder, {D. R.} and Kataria, {D. O.} and T. S{\"a}les and P. Riihel{\"a} and W. Schmidt and H. Koskinen and J. Kozyra and J. Luhmann and E. Roelof and D. Williams and S. Livi and Curtis, {C. C.} and Hsieh, {K. C.} and Sandel, {B. R.} and M. Grande and M. Carter and Sauvaud, {J. A.} and A. Fedorov and Thocaven, {J. J.} and S. Orsini and R. Cerulli-Irelli and M. Maggi and P. Wurz and P. Bochsler and A. Galli and N. Krupp and J. Woch and M. Fr{\"a}nz and K. Asamura and C. Dierker",

note = "Funding Information: The ASPERA-3 experiment on the European Space Agency (ESA) Mars Express is a joint effort among 15 laboratories in 10 countries, all supported by their national agencies. We thank all these agencies, as well as the various departments and institutes hosting these efforts. Y. Futaana is supported by a Postdoctoral Fellowship for Research Abroad program of the Japan Society for the Promotion of Science. Copyright: Copyright 2006 Elsevier B.V., All rights reserved.",

year = "2006",

month = jun,

doi = "10.1016/j.icarus.2005.09.019",

language = "English",

volume = "182",

pages = "424--430",

journal = "Icarus",

issn = "0019-1035",

publisher = "Elsevier",

number = "2",

}

Futaana, Y, Barabash, S, Grigoriev, A, Holmström, M, Kallio, E, Brandt, PC, Gunell, H, Brinkfeldt, K, Lundin, R, Andersson, H, Yamauchi, M, McKenna-Lawler, S, Winningham, JD, Frahm, RA, Sharber, JR, Scherrer, JR, Coates, AJ, Linder, DR, Kataria, DO, Säles, T, Riihelä, P, Schmidt, W, Koskinen, H, Kozyra, J, Luhmann, J, Roelof, E, Williams, D, Livi, S, Curtis, CC, Hsieh, KC, Sandel, BR, Grande, M, Carter, M, Sauvaud, JA, Fedorov, A, Thocaven, JJ, Orsini, S, Cerulli-Irelli, R, Maggi, M, Wurz, P, Bochsler, P, Galli, A, Krupp, N, Woch, J, Fränz, M, Asamura, K & Dierker, C 2006, 'First ENA observations at Mars: ENA emissions from the martian upper atmosphere', Icarus, vol. 182, no. 2, pp. 424-430. https://doi.org/10.1016/j.icarus.2005.09.019

TY - JOUR

T1 - First ENA observations at Mars

T2 - ENA emissions from the martian upper atmosphere

AU - Futaana, Y.

AU - Barabash, S.

AU - Grigoriev, A.

AU - Holmström, M.

AU - Kallio, E.

AU - Brandt, P. C.

AU - Gunell, H.

AU - Brinkfeldt, K.

AU - Lundin, R.

AU - Andersson, H.

AU - Yamauchi, M.

AU - McKenna-Lawler, S.

AU - Winningham, J. D.

AU - Frahm, R. A.

AU - Sharber, J. R.

AU - Scherrer, J. R.

AU - Coates, A. J.

AU - Linder, D. R.

AU - Kataria, D. O.

AU - Säles, T.

AU - Riihelä, P.

AU - Schmidt, W.

AU - Koskinen, H.

AU - Kozyra, J.

AU - Luhmann, J.

AU - Roelof, E.

AU - Williams, D.

AU - Livi, S.

AU - Curtis, C. C.

AU - Hsieh, K. C.

AU - Sandel, B. R.

AU - Grande, M.

AU - Carter, M.

AU - Sauvaud, J. A.

AU - Fedorov, A.

AU - Thocaven, J. J.

AU - Orsini, S.

AU - Cerulli-Irelli, R.

AU - Maggi, M.

AU - Wurz, P.

AU - Bochsler, P.

AU - Galli, A.

AU - Krupp, N.

AU - Woch, J.

AU - Fränz, M.

AU - Asamura, K.

AU - Dierker, C.

N1 - Funding Information: The ASPERA-3 experiment on the European Space Agency (ESA) Mars Express is a joint effort among 15 laboratories in 10 countries, all supported by their national agencies. We thank all these agencies, as well as the various departments and institutes hosting these efforts. Y. Futaana is supported by a Postdoctoral Fellowship for Research Abroad program of the Japan Society for the Promotion of Science. Copyright: Copyright 2006 Elsevier B.V., All rights reserved.

PY - 2006/6

Y1 - 2006/6

N2 - The neutral particle detector (NPD) on board Mars Express has observed energetic neutral atoms (ENAs) from a broad region on the dayside of the martian upper atmosphere. We show one such example for which the observation was conducted at an altitude of 570 km, just above the induced magnetosphere boundary (IMB). The time of flight spectra of these ENAs show that they had energies of 0.2-2 keV/amu, with an average energy of ∼1.1 keV/amu. Both the spatial distribution and the energy of these ENAs are consistent with the backscattered ENAs, produced by an ENA albedo process. This is the first observation of backscattered ENAs from the martian upper atmosphere. The origin of these ENAs is considered to be the solar wind ENAs that are scattered back by collision processes in the martian upper atmosphere. The particle flux and energy flux of the backscattered ENAs are 0.9 - 1.3 × 107 cm-2 s-1 and ∼ 9.5 × 109 eV cm-2 s-1, respectively.

AB - The neutral particle detector (NPD) on board Mars Express has observed energetic neutral atoms (ENAs) from a broad region on the dayside of the martian upper atmosphere. We show one such example for which the observation was conducted at an altitude of 570 km, just above the induced magnetosphere boundary (IMB). The time of flight spectra of these ENAs show that they had energies of 0.2-2 keV/amu, with an average energy of ∼1.1 keV/amu. Both the spatial distribution and the energy of these ENAs are consistent with the backscattered ENAs, produced by an ENA albedo process. This is the first observation of backscattered ENAs from the martian upper atmosphere. The origin of these ENAs is considered to be the solar wind ENAs that are scattered back by collision processes in the martian upper atmosphere. The particle flux and energy flux of the backscattered ENAs are 0.9 - 1.3 × 107 cm-2 s-1 and ∼ 9.5 × 109 eV cm-2 s-1, respectively.

KW - atmosphere

KW - Atmospheres

KW - dynamics

KW - Ionospheres

KW - Mars

KW - Solar wind

KW - structure

UR - http://www.scopus.com/inward/record.url?scp=33747355736&partnerID=8YFLogxK

U2 - 10.1016/j.icarus.2005.09.019

DO - 10.1016/j.icarus.2005.09.019

M3 - Article

AN - SCOPUS:33747355736

SN - 0019-1035

VL - 182

SP - 424

EP - 430

JO - Icarus

JF - Icarus

IS - 2

ER -

First ENA observations at Mars: ENA emissions from the martian upper atmosphere

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Keywords

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