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Propagazione

Propagation outlook from Boulder

:Product: Weekly Highlights and Forecasts :Issued: 2019 Sep 23 0156 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 16 – 22 September 2019 Solar activity was at very low levels. …

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Propagation News – 22 September 2019

We had a relatively settled week, with the Kp index remaining at or below four. The high-speed solar wind was the reason for the K-index increase, but it didn’t significantly degrade HF propagation. We are seeing a change to more autumnal HF conditions with north to south paths opening up quite regularly. The summer doldrums are also now fading as …

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The K7RA Solar Update

No sunspots this week, and as of Wednesday we’ve seen 15 spotless days in a row. This is the solar minimum. The current Solar Cycle (24) is expected to end by the end of this calendar year. Average daily solar flux declined from 69.4 to 68.1. Average daily planetary A index declined slightly from 8.9 to 8.3, but average daily …

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Propagation outlook from Boulder

:Product: Weekly Highlights and Forecasts :Issued: 2019 Sep 16 0139 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 09 – 15 September 2019 Solar activity was at very low levels. …

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The K7RA Solar Update

No sunspots this week. Average daily sunspot numbers declined from 3.4 to zero. At the same time, average daily solar flux rose from 67.4 to 69.4. Geomagnetic activity quieted, with average daily planetary A index declining from 19.9 to 8.9, while average daily mid-latitude A index went from 16.7 to 7.7. Predicted solar flux is 68 on September 13-22, 69 …

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Propagation News – 15 September 2019

It was a quiet week, geomagnetically speaking, with the Kp index generally not rising above two. But a lack of sunspots didn’t help HF propagation, which was decidedly uninspiring. There were some highlights though, mostly on FT8. Columbia was decoded on Wednesday evening on 15 metres at a time when CW and SSB users might have thought the band was …

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Propagation outlook from Boulder

:Product: Weekly Highlights and Forecasts :Issued: 2019 Sep 09 0301 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 02 – 08 September 2019 Solar activity was at very low levels. …

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The K7RA Solar Update

Old Cycle 24 sunspots returned this week, but for only two days (Sunday and Monday) with a sunspot number of 12. Average daily solar flux increased from 66 reported in last week’s bulletin to 67.4 this week. Radiation from a coronal hole increased the average planetary A index from 5.7 last week to 19.9 this week, with the level on …

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Propagation News – 8 September 2019

Our prediction last week that there would be a major geomagnetic storm turned out to be correct, although we got the timing a little wrong. The solar material from a coronal hole actually hit the Earth in the early hours of Saturday morning, rather than later that day, sending the three-hourly Kp index up to five. Such was its intensity …

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Propagation outlook from Boulder

:Product: Weekly Highlights and Forecasts :Issued: 2019 Sep 02 0207 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 26 August – 01 September 2019 Solar activity was at very low …

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The K7RA Solar Update

Tad Cook, K7RA, in Seattle, reports: The current stretch of spotless days is now over 3 weeks, according to Spaceweather.com. The continuing quiet seems eerie. For this past reporting week, Thursday through Wednesday, the average daily solar flux (10.7 GHz radiation recorded in Penticton, British Columbia, which roughly tracks with sunspot activity) was only 66. I couldn’t recall when the …

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Propagation News – 1 September 2019

The past week was characterised by a low solar flux index and relatively-calm geomagnetic conditions. There were reports of numerous sporadic E openings this week that livened up the 10m band. On Thursday these spread from Serbia through to Germany, Finland and Norway and were probably caused by a strong jet stream, which can be seen on the Met Office …

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