Ground Based Limb Survey of the Sun Polar Regions in the Hα Line

Details Ground Based Limb Survey of the Sun Polar Regions in the Hα Line Ground Based Limb Survey of the Sun Polar Regions in the Hα Line

Sep 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000ap%26ss.273...17n&link_type=abstract

Astrophysics and Space Science, v. 273, Issue 1/4, p. 17-23 (2000).

Astronomy and Astrophysics

Astrophysics

1

Scientific paper

Evolutions of the cool component of the inner solar corona have an important part in the equilibria and energy transport processes in the sun atmosphere. Since 1994, a numerical daily survey of the entire limb in the Hydrogen Hα line is performed with the HACO coronagraph at Pic-du-Midi observatory. This experiment is included in the general ground based support programs for the SOHO mission. Real and differed time data are available within the solar data base BASS2000. A statistical study using the data set obtained during the first four years of this program shows some important properties of the distribution of the polar ejection and surge events. An asymmetry between North and South polar regions is well established. Its sign reverseal near the time of the apparition of the new solar magnetic activity cycle is discussed.

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