GB2RS Propagation News
Propagation News – 14 February 2021
At the risk of sounding like a stuck record, last week’s HF propagation was characterised by zero sunspots and the geomagnetic effects of a coronal hole. The lack of sunspots is now getting a bit worrying, especially when you consider that traditionally the new cycle normally ramps up quite quickly. At least one joker has […]
Propagation News – 7 February 2021
Last week was dominated by unsettled geomagnetic conditions. These were due to the effects of a high-speed stream from a solar coronal hole. The stream resulted in a co-rotating interaction region, or CIR. CIRs are transition zones between slow- and fast-moving streams of solar wind. Solar wind plasma piles up in these regions, creating density […]
Propagation News – 31 January 2021
We are almost into February and still the Sun is not playing ball in terms of sunspots. This week saw groups 2797, 2799 and 2800 rotate out of view, but all were minuscule and didn’t contribute much. The solar flux index was 76 on Thursday with a sunspot number of 26. There is a plage […]
Propagation News – 24 January 2021
Last week was defined by a lack of sunspots, but otherwise reasonably settled geomagnetic conditions. However, towards the end of the week, the Sun woke up with regions 2797 and 2798 becoming active. The sunspot number rose to 25 on Thursday, although the solar flux index remained in the 70s, reaching 77 on Thursday. This […]
Propagation News – 17 January 2021
Well, no one predicted last week’s geomagnetic disturbance. In case you missed it, the Kp index rose to four on Monday the 11th January. This was caused by the arrival of an interplanetary shock wave from a coronal mass ejection on the Sun, which occurred on Thursday the 7th. NOAA had been predicting a settled […]
Propagation News – 10 January 2021
We start by welcoming in 2021, and here’s hoping that it proves to be more fruitful than 2020 in terms of HF propagation. We’ve started the New Year with zero sunspots and a solar flux index back in the mid-70s on Thursday the 7th. The STEREO Ahead spacecraft is not showing anything of note around […]
