1. GONG Magnetograms and Coronal Field Modeling G.J.D. Petrie, J. Bolding, R. Clark, K. Donaldson-Hanna, J.W. Harvey, F. Hill, C. Toner & T.M. Wentzel National Solar Observatory, Tucson, AZ 85719

2. Background GONG (Global Oscillations Network Group) obtains 2.5’’-pixel intensity, velocity and magnetic flux images every minute from six sites worldwide approximately 90% duty cycle continuous, high-cadence, low-noise photospheric line-of-sight magnetograms new LCD modulators and circuitry reduced uncertainty in zero-point < 0.1 Gauss, instrumental noise about 3 G/minute GONG is the official provider of magnetograms for NASA’s STEREO mission.

5. Near-real-time GONG potential magnetic field products Principal features of global coronal field structure are calculated and plotted. We thank Janet Luhmann, Yan Li and Xuepu Zhao for source code used in the modeling. Green represents positive polarity and red negative polarity. Features include coronal holes, streamer belt, heliospheric current sheet and lines open to the ecliptic plane Products are produced once per hour, and movies are available at http://gong.nso.edu/data/magmap/index.html

15. GONG magnetogram and modeling products to expand More ideas are being implemented and more are welcome GONG Magnetogram Users’ Group (MUG) meeting today 6.30 pm foyer Please exploit this new round-the-clock source of sensitive, high-cadence data http://gong.nso.edu/data/magmap/index.html http://gong.nso.edu/data/magmap/index.html