Geophysical Alert Message

The geophysical alerts provide information about the current conditions for long distance HF radio communications. The alerts use a standardized format and terminology and includes:

3 hourly Space Weather Conditions and Forecast (WWV.txt) Issued every 3 hours.

10.7 cm radio flux information (from Penticton, Canada)

A index (NOAA-planetary average)

K index (NOAA-planetary average)

27-Day Outlook of 10.7 cm Radio Flux and Geomagnetic Indices

The 27-day Space Weather Outlook Table , issued Mondays by 1500 UTC, is a numerical forecast of three key solar-geophysical indices; the 10.7 cm solar radio flux, the planetary A index, and the largest daily K values. A complete summary of weekly activity and 27-day forecasts since 1997, plus an extensive descriptive, are online as The Weekly.

3-Day forecast

This product is designed to be a one page, simple look at recently observed and a three day forecast of space weather conditions. A brief description of why conditions occurred or are forecast is also included for each category. Users requiring a more detailed explanation of events should refer to the Forecast Discussion.

3-Day Geomagnetic Forecast

A daily deterministic and probabilistic forecast, for next three days, of geomagnetic activity. Observed values of Ap and deterministic Ap forecasts are provided, followed by probabilistic forecasts for four categories of geomagnetic activity, and deterministic 3-hourly Kp forecasts for three days.