The global solar magnetic field according to GONG during WHI
Abstract
Line-of-sight photospheric magnetograms are produced every minute at GONG's six sites. Based on these low- noise images, near-real-time synoptic full-surface magnetograms are produced hourly around the clock. In the usual way, potential-field models for the global coronal field are then extrapolated from the photospheric maps hourly, giving a description of large-scale magnetic structure including field changes caused by quasi-static evolution and by flares and coronal mass ejections. This study focuses on the large-scale features of the corona during WHI that have consequences for the heliosphere and space weather: coronal holes, the streamer belt, magnetic flux open to the ecliptic plane and large-scale changes in the field topology. GONG is the official provider of magnetograms for NASA's STEREO mission.
- Publication:
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AGU Spring Meeting Abstracts
- Pub Date:
- May 2008
- Bibcode:
- 2008AGUSMSH53A..03P
- Keywords:
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- 7509 Corona;
- 7511 Coronal holes;
- 7524 Magnetic fields;
- 7529 Photosphere