RSSGB2RS Propagation News

Propagation News – 9 August 2020

| August 7, 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 […]

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Propagation News – 2 August 2020

| July 31, 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 […]

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Propagation News – 26 July 2020

| July 24, 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 […]

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Propagation News – 19 July 2020

| July 17, 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 […]

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Propagation News – 12 July 2020

| July 10, 2020

An elevated solar wind stream moved past Earth late on 4 July and early on the 5th, sending the Kp index to three. This was the most significant solar event of the last week as otherwise the Sun remained calm. The Kp index remained at one or zero for the rest of the week, which […]

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Propagation News – 5 July 2020

| July 3, 2020

This week saw the beginning of a new month and continued sporadic E openings. Traditionally we see a slow down in the number of sporadic E openings in July, but while we are seeing a few periods on 10m when there are no openings, they inevitably reappear. An HF F2-layer opening to Angola occurred on […]

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