Propagazione

ARRL Propagation Forecast Bulletin 30 ARLP030 From Tad Cook, K7RA Seattle, WA July 29, 2022 To all radio amateurs Although images of the sun this reporting week, July 21 to 27, showed plenty of sunspots, only two new spots emerged, one on July 21, and another on July 25. Another new sunspot appeared on July 28, but the sunspot number …

We’ve had a week of lower solar flux indices, despite a smoothed sunspot number in the 50s. The sunspots we have had have been relatively small and pretty inconsequential. The week started off with an SFI of 107, but then declined to 98 by Thursday. The good news is that we have had relatively settled geomagnetic conditions after a wobble …

:Product: Weekly Highlights and Forecasts :Issued: 2022 Jul 25 0307 UTC # Prepared by the US Dept. of Commerce, NOAA, Space Weather Prediction Center # Product description and SWPC contact on the Web # https://www.swpc.noaa.gov/content/subscription-services # # Weekly Highlights and Forecasts # Highlights of Solar and Geomagnetic Activity 18 – 24 July 2022 Solar activity was low. Only C-class flare …

Solar activity increased over this reporting week, July 14 to 20, with average daily sunspot number rising from 102.1 to 137.3, and average daily solar flux from 147.4 to 157.6. Peak sunspot number was 166 on July 17, and peak solar flux was 171.4 on July 15. Geomagnetic activity peaked on July 19 when planetary A index was 26 and …

Last week was almost a repeat performance of the previous week. We had very disturbed geomagnetic conditions on Tuesday, with the Kp index hitting five. But then other days, like Wednesday, when conditions were much more settled. The solar flux index declined from its high of 176 last Saturday to 133 on Thursday. The Sun’s surface is still peppered with …

The Solar Influences Data analysis Center at the Royal Observatory of Belgium indicates that a shock wave was observed in the solar wind parameters around 18 July 20:33 UT. The value of the total magnetic field increased from 8 to 13 nT, the solar wind speed from 410 to 442 km/s and the density from 3 to 8 ppcc. This …

:Product: Weekly Highlights and Forecasts :Issued: 2022 Jul 18 0324 UTC # Prepared by the US Dept. of Commerce, NOAA, Space Weather Prediction Center # Product description and SWPC contact on the Web # https://www.swpc.noaa.gov/content/subscription-services # # Weekly Highlights and Forecasts # Highlights of Solar and Geomagnetic Activity 11 – 17 July 2022 Solar activity reached high levels this period …

Rising solar activity over the past reporting week (July 7 to 13) was reflected in increased sunspot numbers and solar flux and rising geomagnetic activity as well. Average daily sunspot numbers increased from 62.6 to 102.1, with the peak value at 134 on Monday, July 11. Average daily solar flux rose from 103.5 to 147.4, with peak values at 164.9 …

We had another rocky journey last week in terms of HF propagation. The solar flux index climbed from 137 last Saturday to 165 by Thursday, which should have brought better conditions. But the Earth was plagued again by unsettled geomagnetic conditions, with the Kp index hitting four on Monday, the 11th, and five on Tuesday, the 12th. This was due …

:Product: Weekly Highlights and Forecasts :Issued: 2022 Jul 11 0216 UTC # Prepared by the US Dept. of Commerce, NOAA, Space Weather Prediction Center # Product description and SWPC contact on the Web # https://www.swpc.noaa.gov/content/subscription-services # # Weekly Highlights and Forecasts # Highlights of Solar and Geomagnetic Activity 04 – 10 July 2022 Solar activity was at low levels all …

On July 7 Spaceweather.com reported a G-1-class geomagnetic storm underway, with possible increase to G-2 class. They said it was caused by a co-rotating interaction region. The storm subsided, but then came back early on July 8. Late on July 7 Spaceweather.com presented this animation of a large new sunspot AR3053 emerging over the sun’s eastern horizon: https://bit.ly/3bYQImG Notice that …

RSGB GB2RS News Team July 8, 2022 It was a mixed bag of HF propagation last week. The solar flux index was adequate rather than outstanding and a large elongated coronal hole contributed to the Kp index hitting five on the 4 July. However, things became more settled geomagnetically later in the week with the Kp index back down in …