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GONG Magnetograms for STEREO

Explore the improved data quality of GONG magnetograms and synoptic maps, updated every hour and available online. Synoptic maps are generated using a flux-conserving algorithm, offering high SNR and farside imaging comparisons.

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GONG Magnetograms for STEREO

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  1. GONG Magnetograms for STEREO F. Hill Fronting for Jack Harvey, Gordon Petrie, John Bolding, Tom Wentzel, Kerri Donaldson-Hanna, Richard Clark, Cliff Toner

  2. Data Quality • New modulators and driving electronics installed in Spring 2006. • Improvement of factor of 30 in zero-point background. • Background zero point now ± 0.1 G.

  3. Data Delivery – full disk magnetograms • Ten-minute average formed at each of six sites. • Calibration without temporal average. • Images are registered and circularized. • Bad images are rejected. • Resulting magnetogram from each site returned immediately after production. • Available ~10 mins after acquisition on the web in Tucson, 24-7.

  4. Data Delivery – Synoptic Maps • Uses the input of the 10-min averages from the sites. • Images are remapped into heliographic coordinates using flux-conserving algorithm. • Images weighted with cos4 (θ). • Synoptic map generated every hour. • 7000-10000 input images for each map. • Still working on pole filling. • Now available on the web. • Working on “Janus” maps, where latest magnetogram is inserted to update farside.

  5. Example magnetogram Udaipur 2006-Dec-07 10:44 UT

  6. Example synoptic maps

  7. Field extrapolationfor CR2024 GONG SOLIS Wilcox

  8. GONG Farside imaging and calibration AR10923/19030 Movie showing two appearances of AR10923/10930. AR10930 produced many flares, including an X9. Time period: Nov 7, 2006 to Dec 8, 2006. Regions with strong phase shift Control regions Preliminary calibration of farside signal in terms of sunspot area. Very large sunspots are most likely to be detected on the farside. AR10930 has an area of 400 MH, thus a weak signal Irene González-Hernández, Charlie Lindsey, John Bolding

  9. Conclusions • GONG magnetograms are high-cadence, low noise and nearly continuous (87% average duty cycle). • Resulting synoptic maps probably have the highest SNR currently available. • High-quality products available in near real time. • Farside images available for comparison with STEREO data.

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