Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsh11a1494p&link_type=abstract
American Geophysical Union, Fall Meeting 2009, abstract #SH11A-1494
Astronomy and Astrophysics
Astrophysics
[7507] Solar Physics, Astrophysics, And Astronomy / Chromosphere, [7509] Solar Physics, Astrophysics, And Astronomy / Corona, [7524] Solar Physics, Astrophysics, And Astronomy / Magnetic Fields, [7529] Solar Physics, Astrophysics, And Astronomy / Photosphere
Scientific paper
An unexpected aspect of the current long solar minimum between solar cycles 23 and 24 is that polar crown prominences have been observed nearly continuously above the solar limb. However, many of the same polar crown prominences have had only small sections visible against the chromosphere in H-alpha and these sections change from day to day. The presence of much more extensive mass than seen in H-alpha is certain because filaments are seen against the disk much more completely in 304A than in H-alpha. These differences in filament visibility offer a good opportunity to test our concepts of the relationship between filament mass seen in H-alpha and the rate of cancelling magnetic fields in the photosphere. We know from previous observations and theory over more than 20 years that the existence of filaments is closely related to canceling magnetic fields observed at the photosphere. We have made the hypothesis that there is a threshold in the rate of canceling fields below which filaments are not visible against the solar disk in H-alpha but this concept has not been tested. We are testing this hypothesis by calculating the rates of canceling magnetic flux for the different filaments during their passing across the disk for the current minimum and previous maximum of 23rd solar cycle. In our analyses we use data sets from SOHO/MDI, SOHO/EIT, STEREO and ground based observatories.
Martin Sara F.
Panasenco A.
Panasenco Olga
No associations
LandOfFree
Filaments, filament channels and their visibility during the present solar minimum 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 Filaments, filament channels and their visibility during the present solar minimum, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Filaments, filament channels and their visibility during the present solar minimum will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1781361