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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 J+Geophys+Res+Space+Phys
2015 ; 120
(6
): 4503-4518
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Modular model for Mercury s magnetospheric magnetic field confined within the
average observed magnetopause
#MMPMID27656335
Korth H
; Tsyganenko NA
; Johnson CL
; Philpott LC
; Anderson BJ
; Al Asad MM
; Solomon SC
; McNutt RL Jr
J Geophys Res Space Phys
2015[Jun]; 120
(6
): 4503-4518
PMID27656335
show ga
Accurate knowledge of Mercury's magnetospheric magnetic field is required to
understand the sources of the planet's internal field. We present the first model
of Mercury's magnetospheric magnetic field confined within a magnetopause shape
derived from Magnetometer observations by the MErcury Surface, Space ENvironment,
GEochemistry, and Ranging spacecraft. The field of internal origin is
approximated by a dipole of magnitude 190?nT R(M)(3), where R(M) is Mercury's
radius, offset northward by 479?km along the spin axis. External field sources
include currents flowing on the magnetopause boundary and in the cross-tail
current sheet. The cross-tail current is described by a disk-shaped current near
the planet and a sheet current at larger (??5?R(M) ) antisunward distances. The
tail currents are constrained by minimizing the root-mean-square (RMS) residual
between the model and the magnetic field observed within the magnetosphere. The
magnetopause current contributions are derived by shielding the field of each
module external to the magnetopause by minimizing the RMS normal component of the
magnetic field at the magnetopause. The new model yields improvements over the
previously developed paraboloid model in regions that are close to the
magnetopause and the nightside magnetic equatorial plane. Magnetic field
residuals remain that are distributed systematically over large areas and vary
monotonically with magnetic activity. Further advances in empirical descriptions
of Mercury's magnetospheric external field will need to account for the
dependence of the tail and magnetopause currents on magnetic activity and
additional sources within the magnetosphere associated with Birkeland currents
and plasma distributions near the dayside magnetopause.