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)
The messages contain recent solar and geophysical indices, plus a summary of recent significant activity and a forecast of activity in the next 24 hours (based on NOAA Space Weather Scales)
Solar flux is a measurement of the intensity of solar radio emissions with a wavelength of 10.7 cm (a frequency of about 2800 MHz). The A and K indices are a measurement of the behavior of the magnetic field in and around the earth. The K index uses a scale from 0 to 9 to measure the change in the horizontal component of the geomagnetic field. The A index is a daily value on a scale from 0 to 400 to express the range of disturbance of the geomagnetic field. from the announcement. Space Weather describes the conditions in space that affect earth and its technological systems. Space weather is a consequence of the behavior of the sun, the nature of earth’s magnetic field and atmosphere, and our location in the solar system.
Product contains a number of long running data sets, further information for each indice is available online.