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Investigation of the Influence of Magnetic Anomalies on Ion Distributions at Mars

Using data from the Mars Express Ion Mass Analyzer (IMA) we investigate the distribution of ion beams of planetary origin and search for an influence from Mars crustal magnetic anomalies. We have concentrated on ion beams observed inside the induced magnetosphere boundary (magnetic pile-up boundary)... Full description

Journal Title: Space science reviews 2007-03-20, Vol.126 (1-4), p.355-372
Main Author: Nilsson, H.
Other Authors: Carlsson, E. , Gunell, H. , Futaana, Y. , Barabash, S. , Lundin, R. , Fedorov, A. , Soobiah, Y. , Coates, A. , Fränz, M. , Roussos, E.
Format: Electronic Article Electronic Article
Language: English
Subjects:
Publisher: Springer
ID: ISSN: 0038-6308
Link: http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-5600
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title: Investigation of the Influence of Magnetic Anomalies on Ion Distributions at Mars
format: Article
creator:
  • Nilsson, H.
  • Carlsson, E.
  • Gunell, H.
  • Futaana, Y.
  • Barabash, S.
  • Lundin, R.
  • Fedorov, A.
  • Soobiah, Y.
  • Coates, A.
  • Fränz, M.
  • Roussos, E.
subjects:
  • Aerospace Engineering
  • Annan fysik
  • Engineering and Technology
  • Fysik
  • Mars (Planet)
  • Maskinteknik
  • Mechanical Engineering
  • Natural Sciences
  • Naturvetenskap
  • Other Physics Topics
  • Physical Sciences
  • Rymd- och flygteknik
  • Rymdteknik
  • Space Technology
  • Teknik och teknologier
ispartof: Space science reviews, 2007-03-20, Vol.126 (1-4), p.355-372
description: Using data from the Mars Express Ion Mass Analyzer (IMA) we investigate the distribution of ion beams of planetary origin and search for an influence from Mars crustal magnetic anomalies. We have concentrated on ion beams observed inside the induced magnetosphere boundary (magnetic pile-up boundary). Some north-south asymmetry is seen in the data, but no longitudinal structure resembling that of the crustal anomalies. Comparing the occurrence rate of ion beams with magnetic field strength at 400 km altitude below the spacecraft (using statistical Mars Global Surveyor results) shows a decrease of the occurrence rate for modest ( < 40 nT) magnetic fields. Higher magnetic field regions (above 40 nT at 400 km) are sampled so seldom that the statistics are poor but the data is consistent with some ion outflow events being closely associated with the stronger anomalies. This ion flow does not significantly affect the overall distribution of ion beams around Mars.
language: eng
source:
identifier: ISSN: 0038-6308
fulltext: no_fulltext
issn:
  • 0038-6308
  • 1572-9672
  • 1572-9672
url: Link


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titleInvestigation of the Influence of Magnetic Anomalies on Ion Distributions at Mars
creatorNilsson, H. ; Carlsson, E. ; Gunell, H. ; Futaana, Y. ; Barabash, S. ; Lundin, R. ; Fedorov, A. ; Soobiah, Y. ; Coates, A. ; Fränz, M. ; Roussos, E.
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descriptionUsing data from the Mars Express Ion Mass Analyzer (IMA) we investigate the distribution of ion beams of planetary origin and search for an influence from Mars crustal magnetic anomalies. We have concentrated on ion beams observed inside the induced magnetosphere boundary (magnetic pile-up boundary). Some north-south asymmetry is seen in the data, but no longitudinal structure resembling that of the crustal anomalies. Comparing the occurrence rate of ion beams with magnetic field strength at 400 km altitude below the spacecraft (using statistical Mars Global Surveyor results) shows a decrease of the occurrence rate for modest ( < 40 nT) magnetic fields. Higher magnetic field regions (above 40 nT at 400 km) are sampled so seldom that the statistics are poor but the data is consistent with some ion outflow events being closely associated with the stronger anomalies. This ion flow does not significantly affect the overall distribution of ion beams around Mars.
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subjectAerospace Engineering ; Annan fysik ; Engineering and Technology ; Fysik ; Mars (Planet) ; Maskinteknik ; Mechanical Engineering ; Natural Sciences ; Naturvetenskap ; Other Physics Topics ; Physical Sciences ; Rymd- och flygteknik ; Rymdteknik ; Space Technology ; Teknik och teknologier
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abstractUsing data from the Mars Express Ion Mass Analyzer (IMA) we investigate the distribution of ion beams of planetary origin and search for an influence from Mars crustal magnetic anomalies. We have concentrated on ion beams observed inside the induced magnetosphere boundary (magnetic pile-up boundary). Some north-south asymmetry is seen in the data, but no longitudinal structure resembling that of the crustal anomalies. Comparing the occurrence rate of ion beams with magnetic field strength at 400 km altitude below the spacecraft (using statistical Mars Global Surveyor results) shows a decrease of the occurrence rate for modest ( < 40 nT) magnetic fields. Higher magnetic field regions (above 40 nT at 400 km) are sampled so seldom that the statistics are poor but the data is consistent with some ion outflow events being closely associated with the stronger anomalies. This ion flow does not significantly affect the overall distribution of ion beams around Mars.
pubSpringer
doi10.1007/s11214-006-9030-0