Further development in theory/data closure of the photoelectron-driven polar wind and day-night transition of the outflow

Details Further development in theory/data closure of the photoelectron-driven polar wind and day-night transition of the outflow Further development in theory/data closure of the photoelectron-driven polar wind and day-night transition of the outflow

Aug 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998angeo..16..948t&link_type=abstract

Annales Geophysicae, vol. 16, Issue 8, pp.948-968

Physics

13

Scientific paper

Recent in situ observations have revealed novel features in the polar wind. Measurements between 5000 and 9000 km altitude by the Akebono satellite indicate that both H+ and O+ ions can have remarkably higher outflow velocities in the sunlit region than on the nightside. Electrons also display an asymmetric behavior: the dayside difference in energy spread, greater for upward-moving than downward-moving electrons, is absent on the nightside. Here, we discuss the further development of a theory by Tam et al. that can explain most of these observed peculiar properties by properly taking into account the global, kinetic, collisional effects of the sunlit photoelectrons, on the background polar wind and the electric field. Quantitative comparisons of the calculated results with actual data will be described. In addition, transition from the daytime photoelectron-driven polar wind to the night-time polar wind will be discussed. Acknowledgements. We thank all the members of the Exos-D project team, especially K. Tsuruda and H. Oya, for their extensive support. We are grateful to A. W. Yau for valuable discussion and useful comments on this work. Topical Editor K.-H. Glassmeier thanks J. L. Burch and B. Hultqvist for their help in evaluating this paper.--> Correspondence to: W. Miyake-->

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