GB2RS Propagation News
Propagation News – 4 June 2017
Last week the solar flux index declined from the low 80s to 74. The sun was spotless, but propagation was dominated by strong geomagnetic storming on Sunday the 28th of May. Sky watchers across many northern locations reported visible aurora. This was due to the south-pointing Bz component of the interplanetary magnetic field, which coupled […]
Propagation News – 28 May 2017
Last week’s forecast of unsettled geomagnetic conditions at the beginning of the week and more settled conditions later was fairly accurate. The K index at high latitudes rose to five on Monday, but settled down to two and three by Thursday. At middle latitudes it was very settled after Wednesday. The solar flux index was […]
Propagation News – 21 May 2017
NOAA’s prediction that the solar flux index would tend towards 80 last week turned out be wrong, as it stayed steadfastly in the low 70s. However, the prediction of poor geomagnetic conditions turned out to be right, with the K index hitting four on Wednesday, with worse to come. Nevertheless, there was DX to be […]
Propagation News – 14 May 2017
Last week the solar surface was pretty much bare, other than a tiny speck of a sunspot at mid latitude. This sent the solar flux index down below 70 – the first time it has been there for some time. Given that it never drops much below about 66, even at sunspot minimum, this gives […]
Propagation News – 7 May 2017
Last week saw the solar flux index in the mid-70s with only one sunspot group visible, slap bang in the middle of the disk. Conditions were more settled geomagnetically with the K index actually resting at zero at times on Wednesday and Thursday. This was due to a lack of coronal hole activity, although one […]
Propagation News – 30 April 2017
Last week saw some unsettled conditions due to the effects of a coronal hole. Its associated high speed solar wind stream actually hit the Earth a day earlier than predicted, resulting in poor HF conditions during the International Marconi Day event on Saturday, 21 April. The planetary K-index hit six the night before and we […]
