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The observation of a coronal transient directed at earth
Howard, R. A.; Michels, D. J.; Sheeley, N. R., Jr.; Koomen, M. J.
AA(U.S. Navy, E. O. Hulburt Center for Space Research, Washington, DC), AB(U.S. Navy, E. O. Hulburt Center for Space Research, Washington, DC), AC(U.S. Navy, E. O. Hulburt Center for Space Research, Washington, DC), AD(U.S. Navy, E. O. Hulburt Center for Space Research, Washington, DC)
Astrophysical Journal, Part 2 - Letters to the Editor, vol. 263, Dec. 15, 1982, p. L101-L104. (ApJL Homepage)
Publication Date:
Solar Physics
NASA/STI Keywords:
International Sun Earth Explorer 3, Interplanetary Medium, Solar Corona, Solar Limb, Solar Terrestrial Interactions, Solar Wind, Propagation Velocity, Shock Fronts, Shock Wave Propagation, Space Plasmas, Type 2 Bursts
Bibliographic Code:


The paper reports the observation of a large coronal transient that can only be interpreted as a three-dimensional structure. Its form is one which has not been observed before: a gradually expanding, sun-centered disk of excess brightness, whose projected radius increased from 4 to 8 solar radii during 0832-0958 UT on November 27, 1979. This earth-directed transient was the source of an interplanetary shock wave that reached ISEE 3 at 0649 UT, November 30, and earth at 0738 UT, November 30. Fitting the shock speed at ISEE 3 and the average transit speed from the sun to ISEE 3 to a power law of the form V = (V0)(r exp -n), it is found that V0 = 1980 km/s and n = 0.294, in good agreement with shock wave models. The shock speed predicted by the power law at 10 solar radii is 1000 km/s, in good agreement with the estimated frontal speed of the transient.

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