Large-scale structure of the polar solar wind at solar maximum: ULYSSES/URAP observations

1 January 2003

proceedings article
Published by AIP Publishing in AIP Conference Proceedings

Vol. 679 (1) , 59-62
https://doi.org/10.1063/1.1618541

Abstract

We outline the recent in situ radio observations obtained by Ulysses during its second fast latitude scan near the 2001 solar maximum. From ∼ 72° N, Ulysses was embedded in a continuous fast wind associated with a northern polar coronal hole. During that period, we enlight the variation of the electron density and thermal temperature with the heliocentric distance and latitude, obtained with the quasi‐thermal noise spectroscopy method. Since the scaled mass flux is observed roughly constant, we derive the profile of the electron thermal temperature, assuming a simple power‐law model. Indeed, we find that the electron density varies as R −2.0±0.1 while the thermal temperature varies as R −0.7±0.1, in good agreement with the results obtained in polar coronal holes in 1995 near solar minimum.

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