GB2RS Propagation News
Propagation News – 1 September 2024
We had a good week for HF propagation, at least until we had a Kp index of 5.67 on Wednesday, the 28th. This was caused by the Bz component of the interplanetary magnetic field moving into a south-pointing position. Luckily, it didn’t last long and geomagnetic conditions were back to normal by Thursday. The solar […]
Propagation News – 25 August 2024
We had yet another week with a high solar flux and relatively calm geomagnetic conditions. The solar flux index ended up at 239 on Thursday 22 August, while the Kp index has been below 4 since Sunday 18 August. There are currently 11 active sunspot regions on the Sun’s surface and there is a 20% […]
Propagation News – 18 August 2024
Last week was notable for its auroral activity, high solar flux index and variable HF conditions. Monday 12 August saw the Kp index rise to 7 as coronal mass ejection material struck the Earth, sparking visible aurora as far south as Cornwall. But by lunchtime on Tuesday things were back to normal with a Kp […]
Propagation News – 11 August 2024
Well, so much for the experts! NOAA predicted that the solar flux index would fall last week, when it actually increased to a whopping 303 on Thursday 8 August. But this high solar flux number was accompanied by a strong risk of solar flares, so it was not all plain sailing. We have had 15 […]
Propagation News – 4 August 2024
We had another week of high solar flux but unsettled geomagnetic indices. The solar flux index, or SFI, was above 200 from the 27 July onwards. There was a worry that multiple coronal mass ejections, or CMEs, might push the Kp index up during the week. In the end, the Kp index didn’t rise above […]
Propagation News – 28 July 2024
We had yet another week of high sunspot numbers and low geomagnetic disturbances, but will it last? We dodged a bullet last week after a weak coronal mass ejection, or CME, on Tuesday 23 August failed to generate a geomagnetic storm. This was from a faint halo CME observed on Sunday, which was much weaker […]
