A Doppler dimming determination of coronal outflow velocity

Details A Doppler dimming determination of coronal outflow velocity A Doppler dimming determination of coronal outflow velocity

Jul 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...412..410s&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 412, no. 1, p. 410-420.

Computer Science

Sound

48

Coronal Holes, Dimming, Doppler Effect, Sounding Rockets, Astronomical Models, Chromosphere, Coronagraphs, Flow Velocity, Lyman Alpha Radiation, Particle Emission, Radial Velocity

Scientific paper

Outflow velocities in a polar coronal hole are derived from observations made during a 1982 sounding rocket flight. The velocity results are derived from a Doppler dimming analysis of resonantly scattered H I Ly-alpha. This analysis indicates radial outflow velocities of 217 km/s at 2 solar radii from sun-center with an uncertainty range of 153 to 251 km/s at a confidence level of 67 percent. These results are best characterized as strong evidence for supersonic outflow within 2 solar radii of sun-center in a polar coronal hole. Several means for obtaining improved accuracy in future observations are discussed.

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