GB2RS Propagation News
Propagation News – 3 May 2015
What a difference a week makes. Last week we said the solar flux index was predicted to hit the 130s. This week, apart from one tiny spot in the lower western quadrant, the sun is now looking very bare. At the time of writing the solar flux index was 104, and the USAF prediction for […]
Propagation News – 26 April 2015
Last week we said that the NOAA prediction was for a solar flux index of up to 135, but we thought this was pessimistic. We were proved right as the SFI soared to 154 on the 21st. However conditions remained very unsettled with the Kp index hitting four at times and with many M-class solar […]
Propagation News – 19 April 2015
The last week saw some very unsettled conditions in terms of geomagnetic disturbances, just as we predicted. The 14th, 15th and 16th were particularly bad, with the planetary K index hitting five and the solar wind speed exceeding 600 kilometres per second, sparking reports of visible aurora. The solar flux index leapt up to 155 […]
Propagation News – 12 April 2015
Last week we said that the sun was virtually clear, but spots have a habit of popping up from nowhere. This is exactly what did happen, pushing the solar flux index to a high of 126. Geomagnetic conditions were relatively settled, helping to improve HF propagation. This high declined as the week went on and […]
Propagation News – 5 April 2015
First, as we are now into April, please ensure that you are using the correct smoothed sunspot number of 61 with your VOACAP-based propagation programs. Over the past week the solar flux index continued in the range 120-130. The prediction for the coming week is for ‘more of the same’, with the SFI around 135-145. […]
Propagation News – 29 March 2015
Last week’s solar eclipse was a great opportunity to try out some propagation experiments. Many listeners reported the enhanced reception of distant medium wave stations at the time of maximum eclipse as the D layer of the ionosphere became less absorbing. The other data are currently being analysed for a feature in RadCom. This week […]
