Eruptive prominences of 1980 april 27 observed during STIP interval — X |
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| Authors: | Rajmal Jain A Bhatnagar R N Shelke |
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| Institution: | (1) Vedhshala, Udaipur Solar Observatory, 11, Vidya Marg, 313001 Udaipur |
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| Abstract: | 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. Both the eruptive prominences gave rise
to white-light coronal transients as observed by C/P experiment of High Altitude Observatory on the Solar Maximum Mission.
Type II and moving type IV radio bursts are reported in association with the first Hα eruptive prominence at 0231 UT.
Both the Hα eruptive prominences showed pulse activity with a quasi-periodicity of about 2–4 min. We estimate a magnetic field
in the eruptive prominence of about 100 G and a build-up rate ∼ 1026 ergs-1. 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 Hα features must have initiated the observed coronal transients. From Hα, type
II and coronal-transient observations, we estimate a magnetic field of 2.8 G at 1.9R⊙ from the disc centre, which agrees well with the earlier results. |
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| Keywords: | Sun eruptive prominences mass ejection coronal transients magnetic field |
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