known ' 'solar abundance problem'' space based observations soho continued soho joined solar dynamics observatory sdo also monitoring sun continuously since operations began addition ground based networks notably bison gong continue operate providing nearly continuous data ground see also minute solar cycle differential rotation diskoseismology frequency separation magnetogravity wave moreton wave solar neutrino problem solar tower astronomy stellar rotation references external links https webarchiveorg web http astphysaudk helio outreach english non technical description helio asteroseismology retrieved november https wwwnsfgov news news summjspcntn id org olpa news scientists issue unprecedented forecast next sunspot
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