GB2RS Propagation News
Propagation News – 14 March 2021
The bulk of last week saw settled geomagnetic conditions. Wednesday saw the Kp index at zero for much of the day, which is unusual. This was mainly due to a lack of disruptive coronal holes on the Sun’s surface, so the solar wind speed was mainly below 400 kilometres per second. The Sun was relatively […]
Propagation News – 7 March 2021
We had another week of geomagnetic disturbances due to high-speed solar wind streams. Although the week started well, with a Kp index of zero to three on Sunday, it went rapidly downhill. Monday saw the Kp index hit six and Tuesday evening saw it hit five after the solar wind speed exceeded 600km per second. […]
Propagation News – 28 February 2021
We had a slightly better week in terms of solar activity, but the consensus is that HF propagation is still in the doldrums. Two sunspot groups made an appearance last week, although by now they may have vanished around the Sun’s edge again. Groups 2804 and 2805 pushed the solar flux index to 81 by […]
Propagation News – 21 February 2021
Well, we’ve had another week with zero sunspots, but we did have a geomagnetic disturbance. This was caused by the frozen-in Bz magnetic field of the high-speed solar wind stream going very negative. This means it can couple more easily with the Earth’s magnetic field allowing plasma to flood in. At its peak, the stream’s […]
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 […]
