Outflow velocity of interplume regions at the base of Polar Coronal Holes
Title | Outflow velocity of interplume regions at the base of Polar Coronal Holes |
Publication Type | Journal Article |
Year of Publication | 2000 |
Authors | Patsourakos, S., and Vial J.-C. |
Journal | Astronomy and Astrophysics |
Volume | 359 |
Pagination | L1-L4 |
Date Published | Jul |
Abstract | We report on SUMER/SOHO observations at 1.05 R$_{sun}$ of a well identified interplume region in a South Pole Coronal Hole. Combination of Doppler shifts and Doppler dimming measurements allowed to determine, for the first time, the total wind outflow velocity (\~ 67 km s$^{-1}$) at this height. Our calculations of the outflow velocity benefit from co-spatial and almost co-temporal observations. This large outflow velocity is a strong argument in favour of the interplumes being the main source of the fast solar wind. We find that the mass flux density through the observed interplume is 4.8 10$^{-10}$ g cm$^{-2}$s$^{-1}$ which yields 10$^{-15}$ g cm$^{-2}$s$^{-1}$ at 1 AU with an expansion factor of 11. |
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