The Geophysical Alert Broadcasts consist of three primary sections to describe the Solar-terrestrial environment: The most current information, then a summary of activity for the past 24 hours, and finally a forecast for the next 24 hours. The actual wording of each section of the broadcast is explained below with a brief description of what is being reported. Similar wording is also used in other broadcasts, so the WWV example is relevant to other reports too.
Current Information 'Solar-terrestrial indices for (UTC Date) follow: Solar flux (number) and (estimated) Boulder A index (number) . Repeat, solar flux (number) and (estimated) Boulder A index (number).
The Boulder K index at (UTC time) on (UTC Date) was (number) repeat (number) .' Since the final A index is not available until 0000 UTC, the word 'estimated' is used for the 1800 and 2100 UTC announcements.
Solar Flux Solar Flux is a measurement of the intensity ...[more]