Statistical analysis of the location of the Martian magnetic pileup boundary and bow shock and the influence of crustal magnetic fields

被引：117

作者：

Edberg, N. J. T. ^{[1
,2
]}

Lester, M. ^{[1
]}

Cowley, S. W. H. ^{[1
]}

Eriksson, A. I. ^{[2
]}

机构：

[1] Univ Leicester, Dept Phys & Astron, Leicester LE1 7RH, Leics, England

[2] Swedish Inst Space Phys, S-75121 Uppsala, Sweden

来源：

JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS | 2008年 / 113卷 / A8期

基金：

英国科学技术设施理事会;

关键词：

D O I：

10.1029/2008JA013096

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We use the data set from the magnetometer and electron reflectometer instruments on board the Mars Global Surveyor spacecraft to show that the crustal magnetic fields of Mars affect the location of the magnetic pileup boundary (MPB) and bow shock (BS) globally. We search for crossings of the MPB and BS in the data that were observed over the first 16 months of the mission. To identify the influence of the crustal magnetic fields, all crossings are extrapolated to the terminator plane in order to remove the solar zenith angle (SZA) dependence, and to make it possible to compare crossings independently of location. The MPB crossings that were observed over regions on Mars, which contain strong crustal magnetic fields, are on average located further out than crossings observed over regions with weak crustal fields. This is shown in three separate longitude intervals. We also find that the dayside BS crossings observed over the southern hemisphere of Mars are on average located further out than the BS crossings observed over the northern hemisphere, possibly because of the influence of the crustal fields. We also study the magnetic field strength and its variation at the inside of the MPB and their dependence on the SZA and altitude. We find that the magnitude of the magnetic field in the MPB is closely linked to the altitude of the MPB, with the magnitude increasing as the MPB is observed closer to the planet.

引用

页数：8

共 30 条

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