HF Propagation Indicators

Last Solar Month's Solar-Terrestrial Data, N0NBH

From N0NBH's page:
  • 304A: Solar radiation at 304 Ångström (30.4 nm), due primarily to ionized  helium in the sun's photosphere. One value measured by the Solar Dynamics Observatory, using the EVE instrument, and the other, using data from the SOHO satellite's SEM instrument. Responsible for about half of all the ionization of the F layer. Ultraviolet.
  • X-Ray: NOAA reported value from A0.0 to X9.9. Intensity of hard X-rays hitting the earth’s ionosphere. Impacts primarily the D-layer (HF absorption). 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 (geomagnetic activity):

K-indices Dombås
Source: University of Tromsø
K > 6 => Northern Lights as far south as in Oslo (60 deg North)

Northern Lights from storm.no (Norwegian)

N3KL Propagation Indicators

Solar X-rays: 
Geomagnetic Field:  
K-index (48 hrs): K-index last 48hrs

The Cormac Propadex - Current Ionospheric Conditions

Propadex is updated four times per hour and eight hours of history is shown on the graph. For example, if the Propadex shows +110, it means that the maximum usable frequency is 1.10 MHz higher than the 60 day average for this exact same time of day.

Statistics based on the 250 lasts spots from the OH2AQ web cluster

F5LEN statistics

One Year Solar-Terrestrial Activity Report

    NCDXF/IARU International Beacon Project


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