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D-region absorption predictions (D-RAP)
The D-Region Absorption Product addresses the operational impact of the solar X-ray flux and SEP events on HF radio communication. Long-range communications using high frequency (HF) radio waves (3 - 30 MHz) depend on reflection of the signals in the ionosphere. Radio waves are typically reflected near the peak of the F2 layer (~300 km altitude), but along the path to the F2 peak and back the radio wave signal suffers attenuation due to absorption by the intervening ionosphere. The D-Region Absorption Prediction model is used as guidance to understand the HF radio degradation and blackouts this can cause.

Solar Terrestrial Activity Report            FLUX SUNSPOTS  A-INDEX 
solar Flux=black     solar SunSpots=red     A-index=blue
K-index Dombås
K-indeks Dombås
 FAQ (hva betyr K-index, A-index, Flux?)

Tropo-sjekk fra APRS

Tropo forecast by F5LEN  
F5LEN tropo forecast

E-layer Critical frq  and MUF maps
critical E-layer map   MUF  map
 VOACAP prediction visual calculator
VOAcap calculator


Båndplan og  forskrifter                                                                                                                            Hvordan opererer jeg? 

Solar Terrestial Dispatch
STD main page
critical F2 layer map
critical E-layer map
MUF map   5MHz
MUF map  15MHz
MUF map  25MHz
MUF map  30MHz

Solar FLUX
noaa Aurora
Norsk Romsenter om solen
SOHO-sat  realtime SUN images
NOAA space weather page
 Solar 11 year cycle
 solar picture
solar X-ray
FAQ:  K-index, A-index, Flux

Gode DX-sider
LA5MDA  DX -side
Contests (bullen)
PSKreporter rapporterer hvor du er hørt
 på PSK og JT65-HF

Space weather

space weather by NOAA