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Propagazione

Propagation News – 11 July 2021

As predicted, the solar flux index declined this week, ending at 76 on Thursday. This was due to the large sunspot regions 2835 and 2836 having rotated off the Earth-facing portion of the solar surface. But make a note to check the SFI around July 21 onwards when, hopefully, they will make a return. The sunspots’ departure has left us …

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The K7RA Solar Update

Tad Cook, K7RA, Seattle, reports: Solar activity continues to increase. In last week’s bulletin ARLP027 average daily sunspot number was 34.7. This week it jumped to 55.6. Average daily solar flux increased from 86.9 to 88.9. Despite solar flare activity pushing a sudden ionospheric disturbance and a dramatic HF radio blackout (on July 3), the average daily planetary A index …

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Propagation outlook from SWPC Boulder

:Product: Weekly Highlights and Forecasts :Issued: 2021 Jul 05 0346 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 28 June – 04 July 2021 Solar activity ranged from very low …

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Propagation News – 4 July 2021

Well, NOAA certainly got the sunspot predictions wrong last week. It said that the solar flux index would be in the range 76 to 78 with a maximum Kp index of two. As it turned out, the SFI ended up way higher than this, peaking at 94 on Thursday. Active sunspot regions 2835 and 2836 ended up being bigger and …

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The K7RA Solar Update

Tad Cook, K7RA, Seattle, reports: Solar activity is strong! For the June 24 – July 1 reporting week, the average daily sunspot number rose from 14 to 34.7, while the average daily solar flux bumped up from 79.3 to 86.9. Both figures represent a dramatic increase in solar activity. The sunspot number last Thursday, June 24, was 56 — above …

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Propagation outlook from SWPC Boulder

:Product: Weekly Highlights and Forecasts :Issued: 2021 Jun 28 0115 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 21 – 27 June 2021 Solar activity was at very low to …

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The K7RA Solar Update

Tad Cook, K7RA, Seattle, reports: Average daily sunspot number was 14 this reporting week (June 17 – 23), essentially unchanged from last week’s 13.9. Average daily solar flux increased from 75.2 to 79.3. Geomagnetic indicators were quieter. Average planetary A index declined from 9.6 to 5.3, and average middle latitude A index dropped from 9.7 to 6.1. Predicted solar flux …

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Propagation News – 27 June 2021

We had another week that was largely dominated by Sporadic-E openings. It is worth pointing out that Sporadic-E can and does have a blanketing effect on HF signals, which can prevent them from reaching the F2 layer of the ionosphere. This means that predictions created by a program like VOACAP or ITURHFPROP can often be over optimistic. VOACAP and ITURHFPROP …

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Propagtion outlook from SWPC Boulder

:Product: Weekly Highlights and Forecasts :Issued: 2021 Jun 21 0114 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 14 – 20 June 2021 Solar activity was at very low levels. …

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Propagation News – 20 June 2021

A large coronal hole returned last week and started to become Earth-facing on Monday the 14th. The high-speed solar wind stream from the hole impacted the Earth on Tuesday evening, pushing the Kp index to five. Luckily, conditions returned to normal by late Wednesday and the Kp index was down to two or three thereafter. It now looks like we …

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The K7RA Solar Update

Tad Cook, K7RA, Seattle, reports: Solar activity was lower this week, with the average daily sunspot number declining from 34.9 last week to 13.9 this week. This average was affected by the single day with no sunspots, Saturday, June 12. Average daily solar flux dropped from 77.7 to 75.2. The Penticton observatory in British Columbia (the source for the 10.7-centimeter …

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Geomagnetic Indices, May 2021

GEOMAGNETIC INDICES – Compiled by: Phil Bytheway DXM.EiC@gmail.com Geomagnetic Summary May 01 2021 through May 31 2021 Tabulated from WWV on-line status daily (K @ 0000 UTC): ftp://ftp.swpc.noaa.gov/pub/forecasts/wwv/ Flux A K Space Wx 1 72 5 2 no storms 2 72 10 2 no storms 3 72 5 1 no storms 4 70 4 1 no storms 5 70 2 …

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