Comparison of SPARTAN and UVCS/SOHO Observations

Details Comparison of SPARTAN and UVCS/SOHO Observations Comparison of SPARTAN and UVCS/SOHO Observations

Apr 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997eostr..78..242d&link_type=abstract

Eos Trans. AGU, 78(17), Spring Mtg. Suppl., 242

Astronomy and Astrophysics

Astrophysics

Solar Corona

Scientific paper

Three SPARTAN flights in 1993, 1994, and 1995 provided us with observations of HI Lyman alpha in the south and north polar coronal hole regions. These data span several years of the declining phase of the current solar cycle. We analyzed the data using various diagnostic techniques and obtained strong constraints on the geometry of coronal holes, electron density distributions, hydrogen velocity distributions and outflow velocities. We compare SPARTAN HI Lyman alpha observations with UVCS/SOHO data obtained in solar minimum to characterize changes of the plasma parameters in the polar coronal holes over a four year period. This work is supported by NASA under Grant NAG 5-613 to the Smithsonian Astrophysical Observatory and by NASA under Grant NAG5-3192 to the Smithsonian Astrophysical Observatory, by the Italian Space Agency, and by Swiss Funding Agencies.

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