Outflow velocity of interplume regions at the base of Polar Coronal Holes

Details Outflow velocity of interplume regions at the base of Polar Coronal Holes Outflow velocity of interplume regions at the base of Polar Coronal Holes

Jul 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000a%26a...359l...1p&link_type=abstract

Astronomy and Astrophysics, v.359, p.L1-L4 (2000)

Astronomy and Astrophysics

Astrophysics

36

Sun: Corona, Sun: Solar Wind, Sun: Uv Radiation

Scientific paper

We report on SUMER/SOHO observations at 1.05 Rsun 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-2s-1 which yields 10-15 g cm-2s-1 at 1 AU with an expansion factor of 11.

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