The Connection of 1AU Electron Data to Perpendicular Diffusion

Details The Connection of 1AU Electron Data to Perpendicular Diffusion The Connection of 1AU Electron Data to Perpendicular Diffusion

Jul 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003icrc....6.3723k&link_type=abstract

Proceedings of the 28th International Cosmic Ray Conference. July 31-August 7, 2003. Trukuba, Japan. Under the auspices of the I

Physics

Scientific paper

A 13-months period is observed in the IMP8 ˜6 MeV electron flux data at 1 AU. This period is caused by the varying magnetic connection between the spacecraft and the Jovian electron source, which was detected with Pioneer 10 in 1973 (see [6]). In addition, the data recorded by Pioneer 10 and the other deep space probes can be used to study the electron flux in the outer parts of the heliosphere. Using esp ecially data from the outer heliosphere and also from the Ulysses spacecraft Ferreira et al. [1] determined a form of the diffusion tensor which can fit the observations at solar minimum. Here we demonstrate that the 1 AU data provide a good additional test for the ratio of perpendicular and parallel diffusion. We show that both the phase and the amplitude of the 13-months period depend strongly on this ratio as well as on the solar wind speed, which determines the spiral-angle of the heliospheric magnetic field in the inner heliosphere.

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