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.
One Year Solar-Terrestrial Activity Report
Credit: Jan Alvestad
K index from Dombås, Norway (geomagnetic activity):Source: University of Tromsø. Dombås is 62 deg N and 9 deg E. K > 5 => Northern Lights as far south as in Oslo (55 deg geomagnetic latitude, 60 deg geographic). A map with levels typical for viewing Northern Lights according to location in Europe is here Aurora Service Europe
IonosondesExamples of interpreted ionograms (WA5YIX)
Juliansruh (Northern Germany):
Tromsø (Northern Norway):
- WM7D's Solar Resource Page
- Hepburn's tropospheric ducting forecast
- The 9 MHz rule for selection of HF band: search above 9 MHz in the morning and early daytime hours, and search below 9 MHz in the late afternoon and evening hours.
- The HandyMan's Guide to Solar/Geomagnetic Conditions, Paul Harden, NA5N
- K9LA’s Amateur Radio Propagation Web Site (Carl Luetzelschwab)
- RSGB Propagation Studies Committee pages
- Space weather live
- What's My Geomagnetic Latitude?
- Real-time lightning detection and localization network