Sunspot Magnetic Fields Measured up to 6000 Gauss

Details Sunspot Magnetic Fields Measured up to 6000 Gauss Sunspot Magnetic Fields Measured up to 6000 Gauss

Aug 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006iaujd...3e..54l&link_type=abstract

Solar Active Regions and 3D Magnetic Structure, 26th meeting of the IAU, Joint Discussion 3, 16-17 August, 2006, Prague, Czech R

Computer Science

Scientific paper

Photoelectric `magnetographs' underestimate field strength in sunspot umbrae because of scattered light. Two techniques that do work are photographic spectra or visual observations where the Zeeman sigma components are matched by the observer with the Hale-Nicholson tipping plate and the plate angle is converted to gauss. We study field measures of 32000 spots, 1917 to 2004, from the archives of Mt. Wilson, Potsdam, Rome, and the Crimea. We find 58 spot groups with fields of 4000 G or more. A careful look at the time history of equipment used at Mt. Wilson reveals that the non-linearity of the glass plate at large tilt angles was not taken properly into account, perhaps because of their rarity. When we correct the Mt. Wilson values for strong fields we find several cases of 5000 G and one of 6100 G. Often such strong fields are associated with light bridges, but not always.

Affiliated with

Also associated with

No associations

Rating

Sunspot Magnetic Fields Measured up to 6000 Gauss 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 Sunspot Magnetic Fields Measured up to 6000 Gauss, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Sunspot Magnetic Fields Measured up to 6000 Gauss will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1782784