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Propagation News – 28 February 2021Fri 26th Feb 2021 15:03 GMT

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 2021Fri 19th Feb 2021 15:04 GMT

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 2021Fri 12th Feb 2021 15:18 GMT

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 2021Fri 5th Feb 2021 15:13 GMT

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 […]

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