Magnetic helicity analysis of an interplanetary twisted flux tube

Details Magnetic helicity analysis of an interplanetary twisted flux tube Magnetic helicity analysis of an interplanetary twisted flux tube

Oct 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003jgra..108.1362d&link_type=abstract

Journal of Geophysical Research, Volume 108, Issue A10, pp. SSH 3-1, CiteID 1362, DOI 10.1029/2003JA009942

Physics

Plasma Physics

23

Interplanetary Physics: Ejecta, Driver Gases, And Magnetic Clouds, Interplanetary Physics: Interplanetary Magnetic Fields, Solar Physics, Astrophysics, And Astronomy: Magnetic Fields, And Astronomy: Coronal Mass Ejections, Space Plasma Physics: Kinetic And Mhd Theory

Scientific paper

We compute the magnetic flux and helicity of an interplanetary flux tube observed by the spacecraft Wind on 24-25 October 1995. We investigate how model-dependent are the results by determining the flux-tube orientation using two different methods (minimum variance and a simultaneous fit), and three different models: a linear force-free field, a uniformly twisted field, and a nonforce-free field with constant current. We have fitted the set of free parameters for the six cases and have found that the two force-free models fit the data with very similar quality for both methods. Then, both the comparable computed parameters and global quantities, magnetic flux and helicity per unit length, agree to within 10% for the two force-free models. These results imply that the magnetic flux and helicity of the tube are well-determined quantities, nearly independent of the model used, provided that the fit to the data is good enough.

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