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Propagazione

Propagation outlook from Boulder

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Perseids – a reminder

Active from July 17th to August 26th, 2019  Currently active The Perseids are the most popular meteor shower as they peak on warm August nights as seen from the northern hemisphere. The Perseids are active from July 17 to August 24. They reach a strong maximum on August 12 or 13, depending on the year. Normal rates seen from rural locations …

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The K7RA Solar Update

A new sunspot group appeared only briefly this week, on August 7-8. It was sunspot 2747, from current Cycle 24. Sunspot numbers on Monday and Tuesday were 11 and 12. Average daily solar flux shifted only slightly from last week, from 67 to 67.2. Average planetary A index, a geomagnetic indicator aggregated from magnetometers around the world, more than doubled, …

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Propagation News – 11 August 2019

Matter from a solar coronal hole hit the Earth last week as predicted. However, we got the date wrong, as it actually impacted us on Monday and not Sunday, as it was moving slightly slower than we thought. This sent the Kp index up to five as the Earth’s geomagnetic field was disturbed and where it stayed for four consecutive …

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Propagation outlook from Boulder

:Product: Weekly Highlights and Forecasts :Issued: 2019 Aug 05 0339 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 29 July – 04 August 2019 Solar activity was very low under …

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The K7RA Solar Update

No sunspots were observed over the past week, and solar flux remains flat, with average daily values declining from 67.3 to 67. Average daily planetary A index went from 5.3 to 5, and middle latitude A index from 6.3 to 5.9. Predicted solar flux for the next 45 days remains at 67, August 2 through September 15, every day. Predicted …

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Propagation News – 4 August 2019

A solar coronal hole pushed the Kp index to three last week and the solar flux index was static at 66. The plasma from the hole impacted the Earth on Wednesday, but it didn’t have the dire results that many had predicted. In fact, there was a pre-auroral enhancement that saw the maximum usable frequency over a 3,000km path climb …

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Propagation outlook from Boulder

:Product: Weekly Highlights and Forecasts :Issued: 2019 Jul 29 0117 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 July 2019 Solar activity was at very low levels …

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Propagation News – 28 July 2019

Last week HF was once again dominated by sporadic E openings. On Wednesday FT8 contacts were being made across Europe on 28MHz, from Finland in the north to Spain in the south. It was a similar story on Thursday with S9 signals from the Balearic Islands to Norway. As we head towards August it is best to make the most …

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Propagation outlook from Boulder

:Product: Weekly Highlights and Forecasts :Issued: 2019 Jul 22 0209 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 July 2019 Solar activity was very low on 15-21 …

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The K7RA Solar Update

Very low solar activity continues. Over the past week, average daily solar flux changed insignificantly from 67.1 to 67. There were no sunspots. Average daily planetary A index changed from 8.4 to 5.9, while mid-latitude A index changed from 8.6 to 6.7. Conditions remain quiet. Predicted solar flux is 68 on July 19-26, and 67 on July 27 to September …

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Propagation News – 21 July 2019

There is very little to say about HF propagation last week. Conditions were relatively settled, thanks to a respite from solar coronal hole activity, but the HF summer doldrums are still taking their toll. The summer ionosphere is composed mainly of diatomic gases rather than monatomic, and these are harder to ionise. This means maximum useable frequencies are lower during …

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