z-logo
open-access-imgOpen Access
A three‐dimensional asymmetric magnetopause model
Author(s) -
Lin R. L.,
Zhang X. X.,
Liu S. Q.,
Wang Y. L.,
Gong J. C.
Publication year - 2010
Publication title -
journal of geophysical research: space physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.67
H-Index - 298
eISSN - 2156-2202
pISSN - 0148-0227
DOI - 10.1029/2009ja014235
Subject(s) - magnetopause , solar wind , physics , geophysics , computational physics , interplanetary magnetic field , magnetosheath , dipole , magnetic field , geodesy , geology , quantum mechanics
A new three‐dimensional asymmetric magnetopause model has been developed for corrected GSM coordinates and parameterized by the solar wind dynamic and magnetic pressures ( P d + P m ), the interplanetary magnetic field (IMF) B z , and the dipole tilt angle. On the basis of the magnetopause crossings from Geotail, IMP 8, Interball, TC1, Time History of Events and Macroscale Interactions during Substorms (THEMIS), Wind, Cluster, Polar, Los Alamos National Laboratory (LANL), GOES, and Hawkeye, and the corresponding upstream solar wind parameters from ACE, Wind, or OMNI, this model is constructed by the Levenberg‐Marquardt method for nonlinear multiparameter fitting step‐by‐step over the divided regions. The asymmetries of the magnetopause and the indentations near the cusps are appropriately described in this new model. In addition, the saturation effect of IMF B z on the subsolar distance and the extrapolation for the distant tail magnetopause are also considered. On the basis of this model, the power law index for the subsolar distance versus P d + P m is a bit less than −1/6, the northward IMF B z almost does not influence the magnetopause, and the dipole tilt angle is very important to the north–south asymmetry and the location of indentations. In comparison with the previous empirical magnetopause models based on our database, the new model improves prediction capability to describe the three‐dimensional structure of the magnetopause. It is shown that this new model can be used to quantitatively study how P d + P m compresses the magnetopause, how the southward IMF B z erodes the magnetopause, and how the dipole tilt angle influences the north–south asymmetry and the indentations.

The content you want is available to Zendy users.

Already have an account? Click here to sign in.
Having issues? You can contact us here