Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984japa....5..323j&link_type=abstract
Journal of Astrophysics and Astronomy (ISSN 0250-6335), vol. 5, Sept. 1984, p. 323-330. Research supported by the Ministry of Sc
Astronomy and Astrophysics
Astrophysics
3
Solar Activity, Solar Prominences, H Alpha Line, Solar Corona, Solar Magnetic Field, Solar Radio Bursts
Scientific paper
Observations and analyses of two similar eruptive prominences on the north-east limb observed on 1980 April 27 at 0231 and 0517 UT, which are associated with the Boulder active region No. 2416, are presented. Type II and moving type IV radio bursts are reported in association with the first H-alpha eruptive prominence at 0231 UT. Both the H-alpha eruptive prominences showed pulse activity with a quasi-periodicity of about 2-4 min. A magnetic field in the eruptive prominence of about 100 G and a build-up rate about 10 to the 26th ergs/s are estimated. The high build-up rate indicates that the shearing of the photospheric magnetic field, which fed the energy into the filament, was rapid. It is proposed that fast-moving H-alpha features must have initiated the observed coronal transients. From H-alpha, type II, and coronal-transient observations, a magnetic field of 2.8 G at 1.9 solar radius from the disk center, is estimated, which agrees well with the earlier results.
Bhatnagar Anupam
Jain Rahul
Shelke Rajendra N.
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