Type II bursts, shock waves, and coronal transients - The event of 1980 June 29, 0233 UT

Details Type II bursts, shock waves, and coronal transients - The event of 1980 June 29, 0233 UT Type II bursts, shock waves, and coronal transients - The event of 1980 June 29, 0233 UT

May 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984a%26a...134..222g&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 134, no. 2, May 1984, p. 222-233.

Astronomy and Astrophysics

Astrophysics

54

Coronal Loops, Shock Wave Propagation, Solar Flares, Type 2 Bursts, Coronagraphs, Energy Budgets, Magnetohydrodynamic Waves, Plasma Compression, Solar Magnetic Field, Solar Maximum Mission

Scientific paper

The metric Type-II solar burst event of June 29, 1980, is characterized on the basis of spatially resolved radioheliograph observations obtained at Culgoora, Australia, and visible-light observations obtained with the coronograph/polarimeter of the SMM satellite. The data are presented in images, diagrams, and graphs and discussed in detail. The Type-II emission is found to arise in the dense moving material behind the transient loops, which have sky-plane width 0.5 solar radius and line-of-sight depth 0.1-0.4 solar radius. A faint arc observed moving ahead of the transient loops at about 900 km/sec and not associated with the Type-II burst is attributed to a shock front, and the compression ratio and Alfven Mach number of the enhanced-density region are estimated as n2/n1 = 1.3-3 and M(A) = 1.2-3. The ambient material at 3 solar radii is determined to have Alfven speed 250-625 km/sec and magnetic-field strength 50-120 mG. The total mass of the event is calculated as 700 Tg; the total magnetic energy of the loops is (1.5-15) x 10 to the 29th ergs.

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