Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-10-02
Astronomy and Astrophysics
Astrophysics
8 pages, 3 b/w figures
Scientific paper
Several studies have correlated observations of impulsive solar activity -- flares and coronal mass ejections (CMEs) -- with the amount of magnetic flux near strong-field polarity inversion lines (PILs) in active regions' photospheric magnetic fields, as measured in line-of-sight (LOS) magnetograms. Practically, this empirical correlation holds promise as a space weather forecasting tool. Scientifically, however, the mechanisms that generate strong gradients in photospheric magnetic fields remain unknown. Hypotheses include: the (1) emergence of highly twisted or kinked flux ropes, which possess strong, opposite-polarity fields in close proximity; (2) emergence of new flux in close proximity to old flux; and (3) flux cancellation driven by photospheric flows acting fields that have already emerged. If such concentrations of flux near strong gradients are formed by emergence, then increases in unsigned flux near strong gradients should be correlated with increases in total unsigned magnetic flux -- a signature of emergence. Here, we analyze time series of MDI line-of-sight (LOS) magnetograms from several dozen active regions, and conclude that increases in unsigned flux near strong gradients tend to occur during emergence, though strong gradients can arise without flux emergence. We acknowledge support from NSF-ATM 04-51438.
Li Yadong
Welsch Brian Thomas
No associations
LandOfFree
On the Origin of Strong-Field Polarity Inversion Lines 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 On the Origin of Strong-Field Polarity Inversion Lines, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and On the Origin of Strong-Field Polarity Inversion Lines will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-7637