martedì 26 Ottobre 2021
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Propagazione

The K7RA Solar Update

Tad Cook, K7RA, Seattle, reports: Solar activity is on the upswing this week. Average daily sunspot numbers increased from 21.7 to 50.6, with a high of 77 last Saturday, September 28. Average daily solar flux rose from 78.5 to 88. Average daily planetary A index increased from 4.7 to 9.6, and average daily middle latitude A index went from 5.7 …

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Propagation outlook from SWPC Boulder

:Product: Weekly Highlights and Forecasts :Issued: 2021 Aug 30 0211 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 23 – 29 August 2021 Solar activity was at moderate levels. An …

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Propagation News – 29 August 2021

We had another week with a quiet Sun, but it wasn’t as settled as you might think. Yes, the solar flux index was in the low- to-mid-80s, but the Sun started to get very active. The first event on Sunday saw a prominence eruption off the west limb that flung a coronal mass ejection, or CME, into space. Another eruption …

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The K7RA Solar Update

Tad Cook, K7RA, Seattle, reports: Sun watchers saw no spotless days this week. Average daily sunspot numbers rose from 17.7 last week to 21.7 for the August 19 – 25 reporting week. Average daily solar flux increased from 73.8 to 78.5. Geomagnetic indicators were quiet, with average daily planetary A index declining from 6.1 to 4.7, and average daily middle …

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Propagation Outlook from SWPC Boulder

:Product: Weekly Highlights and Forecasts :Issued: 2021 Aug 23 0105 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 August 2021 Solar activity was low. Multiple C-class events …

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The K7RA Solar Update

Tad Cook, K7RA, Seattle, reports: Weak solar activity persists, but Friday, August 13, was the sole spotless day in the current August 12-18 reporting week. Last week we reported 4 days with no sunspots in the previous 7 days. Average daily sunspot number increased from 9.9 last week to 17.7 during this week. Solar flux was the same, with the …

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Propagation News – 22 August 2021

We had another week of low sunspot numbers, but generally settled geomagnetic conditions. The solar flux index generally stayed in the range of 73-75, which is nothing to get too excited about. The Kp index hit a maximum of three, but was more often at zero or one. Maximum usable frequencies over a 3,000km path have struggled to exceed 18MHz …

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Propagation outlook from SWPC Boulder

:Product: Weekly Highlights and Forecasts :Issued: 2021 Aug 16 0102 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 August 2021 Solar activity was low. An isolated C1 …

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The K7RA Solar Update

Tad Cook, K7RA, Seattle, reports: Solar activity continues to be very weak, and the latest 45-day outlook seems to indicate more of the same ahead. Sunspots only appeared on 3 out of the 7 days in the August 5 – 11 reporting week, and these days were not consecutive. Average daily sunspot numbers actually rose a little, from 6 to …

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Propagation News – 15 August 2021

We had another week of minimal sunspot numbers, a low solar flux, but quiet geomagnetic conditions. As a result, DX was a little harder to find. We did have a low-level C-class solar flare on August the 9th that erupted from a plage region on the Sun. Whether this was a precursor to a sunspot appearing we will have to …

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Propagation outlook from SWPC Boulder

:Product: Weekly Highlights and Forecasts :Issued: 2021 Aug 09 0352 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 August 2021 Solar activity was at very low levels. …

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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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