Statistical analysis of the observations of the MEX/ASPERA-3 NPI in the shadow

被引：7

作者：

Milillo, A. ^{[1
]}

Mura, A. ^{[1
]}

Orsini, S. ^{[1
]}

Massetti, S. ^{[1
]}

Brandt, P. C. Son ^{[2
]}

Sotirelis, T. ^{[2
]}

D'Amicis, R. ^{[1
]}

Barabash, S. ^{[3
]}

Frahm, R. A. ^{[4
]}

Kallio, E. ^{[5
]}

Galli, A. ^{[6
]}

Wurz, P. ^{[6
]}

Holmstrom, M. ^{[3
]}

Roelof, E. C. ^{[2
]}

Winningham, J. D. ^{[4
]}

Ceruili-Irelli, P. ^{[1
]}

Livi, S. ^{[4
]}

Lundin, R. ^{[3
]}

Maggi, M. ^{[1
]}

Morbidini, A. ^{[1
]}

机构：

[1] INAF Inst Fis Spazio Interplanetario, Rome, Italy

[2] Johns Hopkins Univ, Appl Phys Lab, Laurel, MD USA

[3] Swedish Inst Space Phys, S-98128 Kiruna, Sweden

[4] SW Res Inst, San Antonio, TX USA

[5] Finnish Meteorol Inst, FIN-00101 Helsinki, Finland

[6] Univ Bern, Inst Phys, Bern, Switzerland

来源：

PLANETARY AND SPACE SCIENCE | 2009年 / 57卷 / 8-9期

关键词：

Mars; Exosphere; Energetic neutral atoms; Mars express; ENERGETIC NEUTRAL ATOMS; 1ST-ENA OBSERVATIONS; CHARGE-EXCHANGE; HYDROGEN-ATOMS; MARS; OXYGEN; ENAS;

D O I：

10.1016/j.pss.2008.09.016

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The analyser of space plasma and energetic atoms (ASPERA-3) neutral particle imager (NPI) on board Mars Express (MEX) is devoted to energetic neutral atom (ENA) detection within the Martian environment. These ENAs originate from the interaction between the energetic ions flowing inside the Martian environment and the exospheric neutral gas, thus providing crucial information about the dynamics of this interaction. NPI records the instantaneous angular distribution of the energy-integrated ENA signal. In order to identify recurrent ENA signals in the Martian environment, we have performed a statistical analysis of the NPI data. Count rates have been averaged using different methods in order to be able to discriminate signals coming from the planet, from a selected direction, or from specific planetographic regions at the planetary surface. Possible recurrent ENA signals (about 5 x 10(6)(cm(2) sr s)(-1)) are found coming from the terminator direction and above the atmosphere toward nightside when the spacecraft was inside the planetary shadow, mainly close to the shadow edge. Some significant signal was found from the anti-Mars directions in 2005. No statistically significant signal related to pick-up ions from the atmosphere or related to magnetic anomalies above the sensor intrinsic error (estimated as 3 x 10(6) (cm(2) sr s)(-1)) was observed. Our analysis shows that particular attention should be given to the use of NPI data when performing statistical studies: in fact, the sensor has some intrinsic limitations due to inadequate UV suppression, difficulties in sector inter-calibrations, and variations in the sector response versus time. (C) 2008 Elsevier Ltd. All rights reserved.

引用

页码：1000 / 1007

页数：8

共 19 条

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PLANETARY AND SPACE SCIENCE, 2008, 56 (06) : 846 - 851
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Coates, Andrew J.
Winningham, J. David
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ICARUS, 2014, 242 : 297 - 315

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