Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007apj...671.1022j&link_type=abstract
The Astrophysical Journal, Volume 671, Issue 1, pp. 1022-1033.
Astronomy and Astrophysics
Astronomy
27
Sun: Corona, Sun: Magnetic Fields, Sun: Photosphere
Scientific paper
Magnetic helicity is now regarded as an important physical quantity in understanding solar magnetic activities. We have studied the injection of magnetic helicity through the photosphere of four active regions during the long periods of their lifetimes. The rate of helicity injection was determined as a function of time in each active region by applying the local correlation tracking (LCT) method to full-disk, 96 minute cadence magnetograms taken by SOHO MDI. As a result, we have found that most helicity was intensively injected while active regions emerged and grew, suggesting that magnetic flux emergence may be the major process of helicity injection. In all the active regions studied, the rate of helicity injection during flux emergence was initially low, increased and stayed high for a while, and then became low again, while magnetic flux steadily increased at a more or less constant rate all the time. Flux cancellation, as a minor process, resulted in some loss of coronal magnetic helicity, or inverse helicity injection. The contribution of differential rotation to helicity injection was found to be insignificant in these active regions. It was also found that the magnetic helicity budget of an active region strongly depends on its average magnetic flux.
Chae Jongchul
Jeong Hyewon
No associations
LandOfFree
Magnetic Helicity Injection in Active Regions 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 Magnetic Helicity Injection in Active Regions, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Magnetic Helicity Injection in Active Regions will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1527428