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Propagazione

The K7RA Solar Update

Tad Cook, K7RA, Seattle, reports: Average daily sunspot numbers this week rose just a little, from 18.4 to 19, and average daily solar flux edged up from 78.9 to 78.1. Solar activity remains low. The vernal equinox, (the first day of spring in the northern hemisphere) occurs at 0937 UTC on Saturday, March 20. That’s when the southern and northern …

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Propagation outlook from SWPC Boulder

:Product: Weekly Highlights and Forecasts :Issued: 2021 Mar 15 0111 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 08 – 14 March 2021 Solar activity was very low on 08 …

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Propagation News – 14 March 2021

The bulk of last week saw settled geomagnetic conditions. Wednesday saw the Kp index at zero for much of the day, which is unusual. This was mainly due to a lack of disruptive coronal holes on the Sun’s surface, so the solar wind speed was mainly below 400 kilometres per second. The Sun was relatively spotless and at the time …

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The K7RA Solar Update

Tad Cook, K7RA, Seattle, reports: Although solar activity remains low, in recent days, as a sunspot rotates to the west off the visible solar disc a new one emerges in the east. Sunspot group 2807 recently moved over the sun’s western horizon, but on March 9 new sunspot group 2808 moved across the eastern horizon, and a newer group (2809) …

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Propagation outlook from SWPC Boulder

:Product: Weekly Highlights and Forecasts :Issued: 2021 Mar 08 0146 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 01 – 07 March 2021 Solar activity was very low on 01 …

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Propagation News – 7 March 2021

We had another week of geomagnetic disturbances due to high-speed solar wind streams. Although the week started well, with a Kp index of zero to three on Sunday, it went rapidly downhill. Monday saw the Kp index hit six and Tuesday evening saw it hit five after the solar wind speed exceeded 600km per second. The strongly-negative Bz field of …

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The K7RA Solar Update

Tad Cook, K7RA, Seattle, reports: We saw one day during the February 25 – March 3 reporting week — Monday, March 1 — with no sunspots, so the average daily sunspot number declined slightly from 19.6 to 18.9. Two new sunspot groups (2806 and 2807) appeared on Tuesday, March 2. Average daily solar flux increased only slightly during the reporting …

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Geophysical Alert Message (WWV) K=5, G1 storms

Sent: Wednesday, March 3, 2021, 04:07:26 AM GMT+1 Subject: Geophysical Alert Message (WWV) :Product: Geophysical Alert Message wwv.txt :Issued: 2021 Mar 03 0300 UTC # Prepared by the US Dept. of Commerce, NOAA, Space Weather Prediction Center # # Geophysical Alert Message # Solar-terrestrial indices for 02 March follow. Solar flux 75 and estimated planetary A-index 20. The estimated planetary …

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Propagation outlook from SWPC

:Product: Weekly Highlights and Forecasts :Issued: 2021 Mar 01 0255 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 22 – 28 February 2021 Solar activity reached low levels with C-class …

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Propagation News – 28 February 2021

We had a slightly better week in terms of solar activity, but the consensus is that HF propagation is still in the doldrums. Two sunspot groups made an appearance last week, although by now they may have vanished around the Sun’s edge again. Groups 2804 and 2805 pushed the solar flux index to 81 by Thursday, with a sunspot number …

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The K7RA Solar Update

Tad Cook, K7RA, Seattle, reports: Sunspots have returned, and solar activity increased on every day over the reporting week. On Thursday evening, Spaceweather.com reported that sunspot group AR2804 had doubled in size in a single day. The total sunspot area was 200 millionths of a solar hemisphere, a level not seen since the end of last year. It actually took …

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Propagation outlook from SWPC Boulder

:Product: Weekly Highlights and Forecasts :Issued: 2021 Feb 22 0157 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 15 – 21 February 2021 Solar activity was very low. Region 2803 …

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