GB2RS Propagation News
Propagation News – 21 April 2019
Last week was a little better propagation-wise. The Australian IPS T index, as used by the ASAPS computer program for predicting HF propagation frequencies, turn positive again after a week of being at zero or even negative. The T index can be best regarded as an “equivalent sunspot number” – the sunspot number which would […]
Propagation News – 14 April 2019
This has been a difficult time for HF. The solar wind has remained active and the Bz component exhibited several periods of prolonged southward deflection, meaning it more easily coupled with the Earth’s magnetic field. Solar wind speed ranged mostly from 425-475km per second and this was enough to keep the Kp index elevated, often […]
Propagation News – 7 April 2019
Last week saw more of the same as we head towards solar minimum, which is now expected to be some time in 2020. There was a slight increase in the solar flux index later in the week as a new embryonic sunspot appeared on the visible disk. A group of three solar coronal holes threatened […]
Propagation News – 31 March 2019
Last week the predicted increased Kp index from a coronal hole didn’t amount to much. The coronal mass ejection from the Sun a few days earlier wasn’t quite Earth-facing so we dodged the bullet. Other than that, conditions have been quite settled with a maximum Kp index of three caused by an enhanced solar wind. […]
Propagation News – 24 March 2019
The Sun burst into life this week, with two new sunspots and solar flares aplenty. But before you get too excited the spots are from the outgoing solar cycle 24. Sunspot 2736 erupted on Wednesday with a C4-class solar flare. The Earth-directed explosion sent ionisation rippling through Earth’s upper atmosphere and caused a Dellinger fade-out […]
Propagation News – 17 March 2019
There is life in the old dog yet! The lone spotted region on the visible disk of the Sun managed to produce a minor C1.3 flare on 8 March. Although not a noteworthy event as far as peak X-ray strength, the flare was associated with an eruption and what appears to be a faint coronal […]
