Limb Prominence Eruption on 11 August 2000 as Seen From Ground- and Space-Based Observations

Author： Shakhovskaya A.N. Abramenko V.I. Yurchyshyn V.B.

ISSN： 0038-0938

Source： Solar Physics, Vol.207, Iss.2, 2002-06, pp. : 369-379

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Abstract

We report on a prominence eruption as seen in H with the Crimean Lyot coronagraph, the global H network, and coronal images from the LASCO C2 instrument on board SOHO. We observed an H eruption at the northwest solar limb between 07:38:50 UT and 07:58:29 UT on 11 August 2000. The eruption originated in a quiet-Sun region and was not associated with an H filament. No flare was associated with the eruption, which may indicate that, in this case, a flux rope was formed prior to the eruption of the magnetic field. The H images and an H Dopplergram show a helical structure present in the erupted magnetic field. We suggest that the driving mechanism of the eruption may be magnetic flux emergence or magnetic flux injection. The limb H observations provide missing data on CME speed and acceleration in the lower corona. Our data show that the prominence accelerated impulsively at 5.5 km s^-2 and reached a speed slightly greater than 800 km s^-1 in a narrow region (h<0.14 R_⊙) above the solar surface. The observations presented here also imply that, based only on a CME's speed and acceleration, it cannot be determined whether a CME is the result of a flare or an eruptive prominence.