Fourier Parameters of Heliospheric Current Sheet and Their Significance

Details Fourier Parameters of Heliospheric Current Sheet and Their Significance Fourier Parameters of Heliospheric Current Sheet and Their Significance

Apr 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995ssrv...72..149s&link_type=abstract

Space Science Reviews, Volume 72, Issue 1-2, pp. 149-152

Physics

6

Scientific paper

If the path of the neutral line on the coronal source surface is expressible as a singlevalued function (colatitude θ vs longitude φ), then Fourier analysis of ctn θ with respect to φ leads to a simple algorithm for realistically mapping the neutral line outward to model the heliospheric current sheet (HCS) at distancesr≳1 AU. To be compatible with MHD, the source surface used for this mapping should be prolate (aligned with dipole axis) rather than spherical. Orientation of the Sun's magnetic-dipole moment is indicated by them=1 Fourier amplitude (a 1 sin φ+b 1 cos φ) of ctn θ on the source surface. Physical features (including the neutral line) on a prolate source surface intrinsically map to lower dipole latitudes atr≳1 AU in the heliosphere, and Ulysses observations of a unipolar field at latitudes beyond 30°S (when the neutral line on the source surface still reached 39°S) confirm the expected geometry.

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