A radio frequency user's guide to the Space Environment Services Center Geophysical Alert Broadcasts
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The Geophysical Alert Broadcasts
Optional Announcements Added to Geophysical
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24 hours follow 26 October 3-hourly altitudes Ap index Boulder A index bulletin board Colorado Coronal holes daytime region density disturbance Earth radii Earth's ionosphere Earth's magnetic field Earth's upper atmosphere Electromagnetic Radiation electrons ENVIRONMENT SERVICES CENTER event threshold F region filament Flares are classified geomagnetic field geomagnetic storm Geophysical Alert Broadcasts greater Very high increases intensity of solar ionosphere Ks greater M-class M5 or greater magnetosphere maximum Minor storm 30-49 minutes to hours monitor nanoteslas National Oceanic Optional Announcements past 24 hours polar cap absorption radio propagation radio waves radiowaves range Solar activity solar atmosphere Solar Energetic Particles solar flares solar flux number solar radio emissions solar wind Solar-terrestrial indices SPACE ENVIRONMENT SERVICES square degrees stratwarm Sun's sunspot cycle sunspot number Typical K indices ultraviolet Unsettled 8-15 Active updated Usable Frequency Usually no Ks variations watts/square meter wavelength WWVH