A SIMPLE METHOD TO COMPUTE SPHERICAL HARMONIC COEFFICIENTS FOR THE POTENTIAL MODEL OF THE CORONAL MAGNETIC-FIELD

Authors
HAKAMADA K
Citation
K. Hakamada, A SIMPLE METHOD TO COMPUTE SPHERICAL HARMONIC COEFFICIENTS FOR THE POTENTIAL MODEL OF THE CORONAL MAGNETIC-FIELD, Solar physics, 159(1), 1995, pp. 89-96
Citations number
22
Categorie Soggetti
Astronomy & Astrophysics
Journal title
Solar physics → ACNP
ISSN journal
00380938
Volume
159
Issue
1
Year of publication
1995
Pages
89 - 96
Database
ISI
SICI code
0038-0938(1995)159:1<89:ASMTCS>2.0.ZU;2-U
Abstract
It is impossible to make a direct measurement of the coronal magnetic field from the ground. The coronal magnetic field is, then, usually in ferred by extrapolation of the observed photospheric magnetic field. T he so-called 'potential model' has been used for this extrapolation. W e have to solve the Laplacian equation of the magnetic scalar potentia l. This magnetic scalar potential can be expanded into a spherical har monic series. In this paper, new simple recursion formulae are propose d to solve the Laplacian equation; that is, to determine the spherical harmonic coefficients.