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The high-speed stream of solar particles from a coronal hole on the Sun last week wasn’t moving as fast as we initially thought. As a result its impact on Earth, and the subsequent rise in the Kp index to four, happened in the early hours of Tuesday morning and not the weekend as we predicted.

The impact though was relatively short-lived and by late Tuesday the Kp index was back down to two.

The bands were affected though, with the critical frequency as measured at Chilton struggling to reach 5MHz until midday Tuesday. The predicted MUFs over a 3,000km path, according to Propquest.co.uk, looked like a roller coaster ride, often exceeding 18MHz, but then crashing down to below 14MHz.

A smaller coronal hole is now facing Earth, which could mean a higher Kp index over the weekend, although NOAA is not indicating this.

There is some good news though. A small sunspot group, numbered 2759, appeared on the Sun’s surface, pushing the sunspot number to 12. This represents two sunspots (2) in one group (10). The spot’s high latitude suggests it is from the upcoming Solar Cycle 25.

But on Thursday morning the SFI was still at a modest 69.

NOAA predicts that next week the solar flux index will remain at about 68-70 and geomagnetically the Kp index will remain at about two.

The good news is there are signs that the higher HF bands are remaining open longer. As the season progresses this should improve, with 30m and even 20m eventually remaining open until very late.

We are also heading towards the 2020 Sporadic E season, which should bring strong short-skip signals on 10m, but more about that in the VHF section.

VHF and up

The weather produced some half-hearted attempts at Tropo in the past week and even some weak sporadic E opportunities appeared on 10m and 6m.

This week looks to be rather mixed in a weather sense. The high will weaken and drift east allowing low pressure to move towards northwest Britain from the Atlantic with a series of fronts crossing the country next week.

This will offer the chance of April shower rain scatter at times and then, by next weekend, there may be a rebuilding of high pressure to the east with a hint of Tropo and warmth to end the week.

The month of April is traditionally the start of early Es on 10m and 6m via traditional modes like CW and SSB. For example, a weak jet stream over the Pyrenees mid-week could favour paths to IS0, EA6, EA5 etc.

Remember that springtime is also a good chance to get some auroral activity, so check those Kp values, anything above four or five is interesting.

Moon declination is positive until Tuesday as is perigee, so losses will be at their lowest and Moon windows will shorten as the week goes on. 144 MHz sky noise is low so in all, a good week for EME.

We are still in the annual low activity period for shower meteors until the Lyrids that should start on the 16th of this month. Keep checking around dawn for the best random meteor contacts.

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NARC Training 2020

Amateur Radio Training with NARC

Training is very important to NARC because we realise this is how new people come into the hobby and attain their Foundation, Intermediate and Advance Amateur Radio licenses.
We are pleased to offer courses which are based on demand and our programme of other events and activities. To register your interest for a course and exam please email your name and contact details, together with which level of training course you are waiting for,  to the Club Exam Secretary David Palmer G7URP: This email address is being protected from spambots. You need JavaScript enabled to view it.

Club meetings

 CLUB MEETINGS - NARC Live!

During the current Covid-19 pandemic when the club cannot physically meet, the club now broadcasts its own magazine show NARC Live! every Wednesday with news, features and guests.
It is streamed online live from 19.30 BST at the following places:

• Facebook Live:
www.facebook.com/norfolkamateurradioclub/

• BATC Streaming service:
www.batc.org.uk/live/NARC

The club meets virtually every Wednesday throughout the year in the sixth form centre of the City of Norwich School, Eaton Road, Norwich, NR4 6PP from 1900-2130.

We welcome anyone of any age, gender or ability and who enjoys experimenting with radio and electronics to come and meet us and see what we do in our hobby.

Please see above ONLINE tab for details of the club programme and below this piece for contacts of club official.

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