GB2RS Propagation News
Propagation News – 23 August 2020
Sunspot region 2772 was rotating off the Sun’s limb at the end of the week. As a result, the solar flux index declined from 74 down to 71 as the Sun’s surface cleared. There was some activity though. A solar storm cloud was hurled into space on 16 August by a slow-motion solar flare in […]
Propagation News – 16 August 2020
By Sunday, sunspot region 2770 will have just about rotated out of view. After a promising start it quickly faded away, but there is more hope as active region AR2771, belonging to Cycle 25, is forming in the Sun’s south-east quadrant. A secondary bright plage region is also now turning into view off the south-east […]
Propagation News – 9 August 2020
The week started with a geomagnetic disturbance caused by a high-speed stream from a coronal hole, which moved past the Earth at a speed in excess of 500 kilometres per second. This was not predicted by NOAA, but it was from a long coronal hole limb that stretched towards the solar equator. It pushed the […]
Propagation News – 2 August 2020
The Sun showed signs of coming back to life this week with not one, but two, sunspot groups. The sunspot number climbed to 22, representing two spots in two separate groups, and the solar flux index rose to 73. This wasn’t really enough to make much of a difference to HF propagation though, but it […]
Propagation News – 26 July 2020
We had quite a quiet week with the Sun with zero sunspots and a settled geomagnetic field. The solar wind speed was slow, between 280 and 330km per second, and its magnetic field was weak, with no significant negative deflections in its important north-south Bz direction. Therefore, the resultant geomagnetic activity was settled. On the […]
Propagation News – 19 July 2020
Last week a coronal mass ejection caught space weather experts by surprise, sending the Kp index up to four for around nine hours on Tuesday. The stream had a strong southward component in its Bz field, which meant it could more easily couple with the Earth’s magnetic field. The weak CME passage was enough to […]
