[W4HM Spaceweather] W4HM Daily HF Radio Wave Propagation Forecast #152

[Thomas F. Giella]

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#152 Issued on Thursday June 1, 2017 at 1530 UTC



We are now in summer/winter solstice type of HF radio wave propagation conditions.



This means generally poor HF radio wave propagation conditions in the northern hemisphere especially at day and generally good HF radio wave propagation conditions in the southern hemisphere especially at day.



Globally HF radio wave propagation conditions are most evenly balanced 

during the fall and spring equinoxes and most diametrically opposed during 

the summer and winter solstices.



Conditions change daily, weekly, monthly, yearly and by decade, as the 

sun rises and sets at different times and at different angles from the 

ecliptic, as well as by radio wave frequency. This is due to changes in the 

maximum usable frequency (MUF), lowest usable frequency (LUF) and F layer 

critical frequency (FoF2).



Global Daily HF Radio Wave Propagation Forecast-

HAMATEUR & SW BROADCAST HF BANDS-





NORTHERN HEMISPHERE RADIO WAVE PROPAGATION-





80-60 (75-60) meters- poor to fair at night and very poor at day, 





40-30 (41-25) meters- fair to good at night and poor at day,





20-17 (22-15) meters- fair to good at night and poor to fair at day, 





15 (13) meters- very poor at night and poor to fair at day,





12(11) meters- very poor at night and poor at day.





10 (11) meters- very poor at night and very poor at day.







SOUTHERN HEMISPHERE RADIO WAVE PROPAGATION-



80-60 (75-60) meters- good at night and poor at day, 





40-30 (41-25) meters- good at night and fair at day,





20-17 (22-15) meters- very poor at night and good at day, 





15 (13) meters- very poor at night and fair to good at day,





12 (11) meters- very poor at night and fair at day.





10 (11) meters- very poor at night and poor at day.



Received RF signal strength scale-



Very Good- +1 over S9 Or Greater

Good- S7-9

Fair- S4-6

Poor- S1-3

Very Poor- S0



Meter Band Equivalents

Ham & SWL

160->   90

80->     75

60->     60

40->     49, 41

30->     31, 25

20->     22, 19

17->    16, 15

15->    13

12,10-> 11





This HF Radio wave propagation forecast is based on the W4HM_Cap HF radio wave propagation prediction software.



The hamateur radio JT65A mode RF signal levels received are based on 5 watts and ½ wave dipole up at 40 feet.



The hamateur radio PSK31 mode RF signal levels received are based on 25 watts and ½ wave dipole up at 40 feet.



The hamateur radio CW mode RF signal levels received are based on 50 watts and ½ wave dipole up at 40 feet.



The hamateur radio SSB RF mode signal levels received are based on 100 watts and ½ wave dipole up at 40 feet.



The HF shortwave broadcast band AM Mode RF signal levels are based on 100,000 watts (100 kw) and a typical VOA type curtain array antenna.



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Please keep in mind that this is a relatively simplified HF radio wave 

propagation forecast, so as to keep it easily understandable and applicable by the average radio enthusiast.



Globally HF radio wave propagation conditions are most evenly balanced 

during the fall and spring equinoxes and most diametrically opposed during 

the summer and winter solstices.



Conditions change daily, weekly, monthly, yearly and by decade, as the 

sun rises and sets at different times and at different angles from the 

ecliptic, as well as by radio wave frequency. This is due to changes in the 

maximum usable frequency (MUF), lowest usable frequency (LUF) and F layer 

critical frequency (FoF2).



The D and E layers also