AAS 200th meeting, Albuquerque, NM, June 2002
Session 4. Helioseismology and the Solar Interior
Display, Monday, June 3, 2002, 9:20am-6:30pm, SW Exhibit Hall

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[4.03] GONG+ Synoptic Magnetic Field Maps

K.L. Donaldson Hanna, J.W. Harvey (NSO)

Having completed the upgrade of its observing equipment, the Global Oscillation Network Group (GONG) now acquires longitudinal component magnetograms every minute using a 1024 X 1024 square-pixel detector compared to the previous (Classic GONG) program of recording a (1-minute integrated) magnetogram once per hour using a 256 X 242 rectangular-pixel detector. To demonstrate the registration accuracy and the quality of these magnetograms, synoptic maps were created using magnetograms from GONG+, Kitt Peak Vacuum Telescope (KPVT), UCLA Astronomy Group - Mt. Wilson, and Solar Heliospheric Observatory/Michelson-Doppler Imager (SOHO/MDI) for a common Carrington rotation cycle. Comparisons between independent maps constructed from the GONG+ sites (Big Bear, Cerro Tololo, and Learmonth) are also shown to display the excellent geometric agreement between the sites.

The Global Oscillation Network Group project is supported by the National Science Foundation and operates in collaboration with the Big Bear Solar Observatory, High Altitude Observatory, Learmonth Solar Observatory, Udaipur Solar Observatory, Instituto de Astrofisico de Canarias, and Cerro Tololo Interamerican Observatory.

The author(s) of this abstract have provided an email address for comments about the abstract: khanna@noao.edu

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Bulletin of the American Astronomical Society, 34
© 2002. The American Astronomical Soceity.