Last Solar Month's Solar-Terrestrial Data, N0NBH
- 304A: Ultraviolet radiation at 304 Ångström due to ionized helium in the sun's photosphere. One value measured by the Solar Dynamics Observatory's EVE instrument, and the other by the SOHO satellite's SEM instrument. Responsible for about half of the F layer ionization.
- X-Ray: Intensity of hard X-rays hitting the earth’s ionosphere. Impacts primarily the D-layer (HF absorption). Value from A0.0 to X9.9. The letter indicates the order of magnitude (A, B, C, M and X), where A is the lowest. The number further defines the level of radiation.
K index from Dombås, Norway (geomagnetic activity):
Source: University of Tromsø
K > 5 => Northern Lights as far south as in Oslo at 55 deg geomagnetic and 60 deg geographic latitude.
|K-index (48 hrs):|
One Year Solar-Terrestrial Activity Report
- K9LA’s Amateur Radio Propagation Web Site (Carl Luetzelschwab)
- The HandyMan's Guide to Solar/Geomagnetic Conditions, Paul Harden, NA5N
- RSGB Propagation Studies Committee pages
- What's My Geomagnetic Latitude?