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Propagazione

The K7RA Solar Update

Sunspots finally returned on September 29, after over two weeks with none. Average daily sunspot numbers increased from 0 to 9.6, and average daily solar flux increased from 67.9 to 68.4 over the past week, September 27 through October 3. Average daily planetary A index declined from 10.9 to 7.7, while average mid-latitude A index changed from 7.9 to 6.1. …

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Propagation News – 7 October 2018

There are signs that ionospheric conditions are improving as we head into autumn. This isn’t unexpected; as the ionosphere cools there is a chemical shift towards more monatomic species that are easier to ionise. The 4U1UN New York, VE8AT Nunavut and ZS6DN Pretoria beacons on 14.100MHz were all audible at the same time on Wednesday, and we can expect transatlantic …

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Propagation outlook from Boulder

:Product: Weekly Highlights and Forecasts :Issued: 2018 Oct 01 0253 UTC # Prepared by the US Dept. of Commerce, NOAA, Space Weather Prediction Center # Product description and SWPC contact on the Web # http://www.swpc.noaa.gov/weekly.html # # Weekly Highlights and Forecasts # Highlights of Solar and Geomagnetic Activity 24 – 30 September 2018 Solar activity was at very low levels …

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Propagation News – 30 September 2018

At the risk of sounding very samey, the solar flux index remained at around 67-68 with zero sunspots this week, and just a few points off what we can expect at absolute solar minimum. As predicted, geomagnetic conditions were relatively poor at the beginning of the week, but did improve slightly later on, although the K-index remained at three at …

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Propagation de K7RA

SB PROP @ ARL $ARLP039 ARLP039 Propagation de K7RA ZCZC AP39 QST de W1AW Propagation Forecast Bulletin 39 ARLP039 From Tad Cook, K7RA Seattle, WA September 28, 2018 To all radio amateurs SB PROP ARL ARLP039 ARLP039 Propagation de K7RA The Sun remained spotless over the past week, and by September 27 the period with no sunspots was over two …

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Propagation outlook from Boulder

:Product: Weekly Highlights and Forecasts :Issued: 2018 Sep 24 0321 UTC # Prepared by the US Dept. of Commerce, NOAA, Space Weather Prediction Center # Product description and SWPC contact on the Web # http://www.swpc.noaa.gov/weekly.html # # Weekly Highlights and Forecasts # Highlights of Solar and Geomagnetic Activity 17 – 23 September 2018 Solar activity was at very low levels …

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Propagation News – 16 September 2018

Last week started with stable solar conditions, but very low activity. After 14 days without sunspots, two small, new spots turned up. Sunspot number 2721 existed for Sunday and Monday, then disappeared by Tuesday. Sunspot number 2722 popped up on Wednesday and Thursday, and was gone by Friday. Neither of these spots has disappeared altogether. They can hide below the …

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The K7RA Solar Update

We observed a return of sunspot activity during the past reporting week (September 6-12), with spots on four days, but not consecutive. Sunspots were visible on September 8-9 and 11-12. Average daily sunspot numbers increased to 7.6, compared to zero over the previous seven days. Average daily solar flux increased from 67.8 to 68.6, and planetary A index doubled from …

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Propagation outlook from Boulder

:Product: Weekly Highlights and Forecasts :Issued: 2018 Sep 10 0413 UTC # Prepared by the US Dept. of Commerce, NOAA, Space Weather Prediction Center # Product description and SWPC contact on the Web # http://www.swpc.noaa.gov/weekly.html # # Weekly Highlights and Forecasts # Highlights of Solar and Geomagnetic Activity 03 – 09 September 2018 Solar activity was at very low levels …

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Reverse-Polarity Sunspot Group Does Not Belong to Cycle 25

The Royal Observatory of Belgium’s Solar-Terrestrial Centre of Excellence (STCE) has asserted that the reverse polarity sunspot group 2720 observed in late August belongs to the current solar cycle — Cycle 24 — and does not represent the start of Cycle 25. “Because of its reversed polarity, some websites claimed sunspot group 2720 was possibly one of the first groups …

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Propagation News  9 September 2018

The Sun was spotless for most of last week and no spots are expected to rotate into view over the next few days. This will keep flux levels low, and working frequencies will remain depressed. Maximum useable frequencies may struggle to include the 18MHz band. Warnings of a rising Kp-index have been issued, and geomagnetic disturbance may increase as next …

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Propagation outlook from Boulder

:Product: Weekly Highlights and Forecasts :Issued: 2018 Sep 03 0229 UTC # Prepared by the US Dept. of Commerce, NOAA, Space Weather Prediction Center # Product description and SWPC contact on the Web # http://www.swpc.noaa.gov/weekly.html # # Weekly Highlights and Forecasts # Highlights of Solar and Geomagnetic Activity 27 August-2 September 2018 Solar activity was at very low levels. Both …

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