Astronomy and Astrophysics – Astronomy
Scientific paper
May 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21640716p&link_type=abstract
American Astronomical Society, AAS Meeting #216, #407.16; Bulletin of the American Astronomical Society, Vol. 41, p.862
Astronomy and Astrophysics
Astronomy
Scientific paper
We report observations through narrow-band filters at total solar eclipses at high cadence to search for Fourier power 1 Hz, a prediction of certain classes of coronal heating through MHD waves, such as surface Alfvén waves. We previous reported such power at the 1999 eclipse (Pasachoff, Babcock, Russell, Seaton, Solar Phys. 207, 241-257, 2002). We observed at 10 Hz for 2 min 20 sec in Siberia in 2008 with the coronal red line at 637.4 nm and the coronal green line at 530.3 nm, and at 6 Hz for 5 min 50 sec at Tianhuangping, China, in 2009 with the coronal green line and a nearby continuum, using 20-cm telescopes. The sky was clear in 2008 while the eclipse was observed through moving clouds in 2009. The weakening corona gave few features on which to make a fine alignment, and much time has been spent on details of aligning the series of images. We report on the status of the alignment and the resulting transforms, and place the results in the context of the solar-activity cycle, which we show through a series of radial-filter images made as part of our expeditions in 1999, 2001, 2006, 2008, and 2009, spanning the most recent sunspot cycle.
Acknowledgments: We thank C. Alex Young, Daniel B. Seaton. Yihua Yan, Jin Zhu, Lin Lan and Chenying Lai. Williams collaborators were Jianjun Wang, Marek Demianski, Huajai Cao, Sara Dwyer, and Rachel Wagner-Kaiser in 2009 and Marcus Freeman, William G. Wagner, and Marek Demianski in 2008. Our expeditions were supported in part by grants from the Committee for Research and Exploration of the National Geographic Society. We thank the NSF Heliospheric Program for 2006 suppport and the Planetary Astronomy division of NASA for imaging-system support.
Babcock Bryce A.
DuPré K.
Kern Jeff
Nesterenko A. A.
Nesterenko Irina
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