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Propagazione

Fenomeno Fading: il Malware dell’Etere

Quante volte durante un ascolto di una Stazione Radio in onda corta ci è capitato di tribolare per l’andamento altalenante del segnale, che arriva già debole di suo, facendoci così perdere un bell’ascolto da un lontano DX. Questo fastidioso fenomeno, caratteristico nella propagazione delle onde radio e più avvertibile sulle frequenze da 3 a 30 Mhz è chiamato Fading. Per …

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The K7RA Solar Update

Tad Cook, K7RA, Seattle, reports: Solar activity took a deep dive during the July 29 – August 4 reporting week. Sunspots were gone July 28 – August 1, so the average daily sunspot number dropped from 33.1 last week to 6 this week. Average daily solar flux slipped from 83 to 74.8. Predicted solar flux is 74 and 73 on …

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Propagation News – 8 August 2021

The last week looked like we were back at solar minimum again! With the solar flux declining to 71, and the sunspot number at 14 on Thursday, it hardly looks like things are improving. This was coupled with news from NASA that they have revised their projections for Solar Cycle 25. NASA heliophysicists at the High Altitude Observatory, based at …

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Propagation Outlook from SWPC Boulder

:Product: Weekly Highlights and Forecasts :Issued: 2021 Aug 02 0415 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 July – 01 August 2021 Solar activity was very low under …

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Propagation News – 1 August 2021

Last week the Sun was bursting with sunspots, with a solar flux index in the high 80s. But, by Thursday, we were looking at a different picture, with zero sunspots and a solar flux index of 79. We also had a geomagnetic disturbance, thanks to the arrival of a high-speed stream from a coronal hole late on Wednesday. This pushed …

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The K7RA Solar Update

Tad Cook, K7RA, Seattle, reports: Solar activity slowed this week, with the average daily sunspot number declining from 48.9 last week to 33.9 this week (July 22 – 28). Wednesday, July 28, saw no sunspots at all. Average daily solar flux went from 81.3 to 83. Geomagnetic indicators held steady, with average daily planetary A index at 6.4 both last …

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Propagation outlook from SWPC Boulder

:Product: Weekly Highlights and Forecasts :Issued: 2021 Jul 26 0122 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 19 – 25 July 2021 Solar activity was very low on 22 …

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Propagation News – 25 July 2021

Sunspot numbers were down at the start of the week, but increased dramatically as the week went on. By Thursday the solar flux index was up to 94 with a sunspot number of 86. There were six active regions visible on the Sun. Although many of these sunspots were quite small and not very complex, they all contributed to the …

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The K7RA Solar Update

Tad Cook, K7RA, Seattle, reports: It’s exciting to observe increasing sunspot activity. Recently Solar Cycle 25 produced new sunspots frequently, and I watch them pop up every day on Spaceweather.com. New sunspots emerged on July 14, 16, 17, 19 and 20, and two new ones appeared on July 21. When I look at this image from July 22, our sun …

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Propagation outlook from SWPC Boulder

:Product: Weekly Highlights and Forecasts :Issued: 2021 Jul 19 0531 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 12 – 18 July 2021 Solar activity was at very low to …

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Propagation News – 18 July 2021

The solar flux index remained in the 70s last week, reflecting the lack of decent sunspots. What spots we did have were both minuscule and un-noteworthy. The high-speed wind stream from a large solar coronal hole impacted the Earth a little later than predicted. In the end, it hit us during the late afternoon and early evening of Wednesday the …

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The K7RA Solar Update

Tad Cook, K7RA, Seattle, reports: Solar activity declined this week — by a lot. Six and two meters yielded exceptional openings, however. The average daily sunspot number plummeted from 55.6 to 21.3, and the average daily solar flux slid from 88.9 to 72.9. Geomagnetic indicators remained about the same, with average daily planetary A index at 6.6, although the daily …

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