Physics
Scientific paper
Jan 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002mwoc.conf..249m&link_type=abstract
Multi-Wavelength Observations of Coronal Structure and Dynamics -- Yohkoh 10th Anniversary Meeting. Proceedings of the conferenc
Physics
5
Scientific paper
We calculate the magnetic free energy as a function of time for NOAA active region 8299 on 1998 August 11 using vector magnetic field measurements in the ion Na 1 5896Å sepctral line observed with the Imaging Vector Magnetograph at Mees Solar Observatory. The free energy in this active region is significant with a magnitude of about 1033 ergs, though the active region was not flare productive. This amount of free energy is more than enough to explain the enhanced heating of the active region corona. The free energy dipped to a value consistent with zero for one hour during the observation. Yohkoh/SXT images reveal that during this dip in the free energy, the coronal structure of AR 8299 and the nearby AR8297 changed significantly. SXT observed the brightening of a coronal loop connecting AR 8299 and AR 8297 and observed coronal dimming and the formation of a cusp structure in AR 8297, suggesting that a gradual CME was launched as the magnetic energy dipped. Unfortunately, LASCO data were not available to confirm the existence of a halo CME. However, the circumstantial evidence points to the magnetic free energy as the energy source for the postulated CME.
LaBonte Barry J.
Metcalf Thomas R.
Mickey Donald L.
Ryder Leigh A.
No associations
LandOfFree
The Magnetic Free Energy and a CME in Active Region 8299 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with The Magnetic Free Energy and a CME in Active Region 8299, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The Magnetic Free Energy and a CME in Active Region 8299 will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1838396