Physics – Plasma Physics
Scientific paper
Jun 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005georl..3212109h&link_type=abstract
Geophysical Research Letters, Volume 32, Issue 12, CiteID L12109
Physics
Plasma Physics
7
Interplanetary Physics: Ejecta, Driver Gases, And Magnetic Clouds, Interplanetary Physics: Interplanetary Magnetic Fields, Space Plasma Physics: Mathematical And Numerical Techniques (0500, 3200)
Scientific paper
We examine a method of calculating the magnetic helicity of cylindrical magnetic flux rope of arbitrary cross section from in-situ spacecraft data. First we examine the gauge invariance of the definition of relative helicity by Finn and Antonsen (1985). Two approaches based on Grad-Shafranov equation are then described. A case study is presented to illustrate the method. The results show significant discrepancies from an earlier study utilizing axially symmetric models. We briefly discuss the potential applications for Sun-Earth connection.
Dasgupta Basudeb
Hu Qiang
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