Journal ArticleDOI
Imaging the effect of dipole tilt on magnetotail boundaries
TLDR
In this article, the shape of the neutral sheet and magnetopause boundaries can be observed directly from the images and a fitting function that qualitatively matches the observed boundary shape can then be chosen.Abstract:
Eight years of Interplanetary Monitoring Platform (IMP) 8, four years of International Sun Earth Explorer (ISEE) 2, and one year of IMP 7 magnetometer data have been combined to produce an 'image' of the average magnetic field for a YZ cross section (aberrated GSM) of the magnetotail at a downtail distance of 25 R(sub E). The shape of the neutral sheet and magnetopause boundaries can be observed directly from the images. A fitting function that qualitatively matches the observed boundary shape can then be chosen. This approach improves on previous fits to possible unsuitable functional forms specified independently of the data. In addition, as a refinement of previous studies, we have corrected for varying solar wind dynamic pressure and the effects of tail flaring. We find the magnetopause is displaced above the XY plane with increasing dipole tilt. The neutral sheet is found to curve slightly more than the model of Fairlfield (1980) during times of large dipole tilt and near the flanks appears to differ substantially from the neutral sheet shape given by the analytic model of Voigt (1984), the more recent neutral sheet model of Dandouras (1988) based on the Voigt model, and the semi-empirical model of Tsyganenko (1989).read more
Citations
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Journal ArticleDOI
Statistical characteristics of bursty bulk flow events
Vassilis Angelopoulos,Charles F. Kennel,Ferdinand V. Coroniti,R. Pellat,Margaret G. Kivelson,Raymond J. Walker,Christopher T. Russell,Wolfgang Baumjohann,W. C. Feldman,J. T. Gosling +9 more
TL;DR: In this paper, the statistical properties of bursty bulk flow events (BBFs) in the inner plasma sheet (IPS) were analyzed using data from active magnetospheric particle tracer Explorer/Ion Release Module (AMPTE/IRM) and International Sun-Earth Explorer 2 (ISEE 2) satellites.
Journal ArticleDOI
A wavy twisted neutral sheet observed by CLUSTER
TL;DR: In this article, the authors postulate that a wavy motion in the dawn-dusk direction is superimposed on an extremely twisted and warped neutral sheet, which implies a strongly twisted magnetotail on a local scale.
Journal ArticleDOI
Interplanetary magnetic field control of magnetotail magnetic field geometry: IMP 8 observations
TL;DR: In this paper, the authors describe how the field geometry in the cross-sectional plane responds to different IMF orientations: dominant By, dominant +Bz, and dominant −Bz.
Journal ArticleDOI
THEMIS observations of ULF wave excitation in the nightside plasma sheet during sudden impulse events
Quanqi Shi,Quanqi Shi,Michael Hartinger,Vassilis Angelopoulos,Qiugang Zong,Xu-Zhi Zhou,X. Zhou,Adam Kellerman,Anmin Tian,James M. Weygand,S. Y. Fu,Z. Y. Pu,Joachim Raeder,Yasong Ge,Y. F. Wang,Hui Zhang,Zhonghua Yao +16 more
TL;DR: In this paper, the authors examined the ULF response of the nightside plasma sheet to sudden impulses (SIs) using an ensemble of 13 SI events observed by THEMIS (Timed History of Events and Macroscale Interactions during Substorms) satellites (probes).
Journal ArticleDOI
The Galileo Earth encounter: Magnetometer and allied measurements
Margaret G. Kivelson,Charles F. Kennel,Robert L. McPherron,Christopher T. Russell,David J. Southwood,R. J. Walker,Krishan K. Khurana,Paul J. Coleman,C. M. Hammond,Vassilis Angelopoulos,A. J. Lazarus,R. P. Lepping,T. J. Hughes +12 more
TL;DR: An overview of the Galileo magnetometer observations from the crossing of the tail magnetopause at an antisolar distance of close to 100 R(E) through exit into the solar wind on the dayside is presented in this article.
References
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Journal ArticleDOI
A magnetospheric magnetic field model with a warped tail current sheet
TL;DR: In this article, an improved quantitative representation of the magnetic field in the geomagnetosphere is developed, taking into account the effect of warping the tail current sheet in two dimensions due to the geodipole tilt, as well as spatial variations of the current sheet thickness along the Sun-Earth and dawn-dusk directions.
Journal ArticleDOI
Semiannual variation of geomagnetic activity
TL;DR: In this article, it was proposed that the semiannual variation in geomagnetic activity is caused by a semiannually variation in the effective southward component of the interplanetary field.
Journal ArticleDOI
Solar wind control of the magnetopause shape, location, and motion
TL;DR: In this paper, the authors verified the pressure balance relationship between the solar wind dynamic pressure and the location of the subsolar magnetopause by assembling a data set of 1821 magnetopsause crossings.
Book
Interplanetary medium data book
TL;DR: In this article, hourly averaged interplanetary plasma and magnetic field data were used to answer unresolved questions on the physics of solar wind and its effects on magnetospheric processes and cosmic ray propagation.
Journal ArticleDOI
Configuration of the geomagnetic tail during substorms
D. H. Fairfield,N. F. Ness +1 more
TL;DR: Geomagnetic tail configuration during substorms from Imp 4 magnetic field and auroral index measurements as discussed by the authors was used to estimate the geomagnetic properties of the Earth's magnetic field.