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Re: Fri. Mar. 1st RAZoom LiteBIRD mission
The Zoom link for this meeting has been sent out.?Peter Hargrave has asked us to re-schedule as he has a family matter to attend to.? Wolfgang Herrmann is still able to share some new news from Astropeiler.? If anyone else wants a slot in the 2nd half let me know and I can give you space.
If you did not receive the link let me know and use this Sign-up link to confirm your status - . -- ???? Paul Hearn? ???? ?paul@...? ???? ?RA Section Director? ??? |
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Fri. Mar. 1st RAZoom LiteBIRD mission
....unravelling the origins of our universe.? Prof. Peter Hargrave?School of Physics & Astronomy,?Cardiff University.
? Fri. Mar. 1st 19:30 GMT Zoom Room opens at 19:15 GMT.? The link will be sent out on Thursday 29th Feb.~ If you have not been receiving the links you can check your 'Sign-up' status here - ~ EU Conference on Amateur?Radio Astronomy? UK 2025??Let us know if you want to be kept in-touch with developments + some basic information -? -- ???? Paul Hearn? ???? ?paul@...? ???? ?RA Section Director? ??? |
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Making a hydrogen line Cantenna
开云体育At last I am having a go at making myself a Cantenna! If this works it will demonstrate that I can make a full hydrogen line radio telescope for < ?100! This would be a great project to offer members of my local astronomy group. Andy ? |
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HAARP Research Campaign Transmission Notice
Hello HAARP Enthusiasts: HAARP at Gakona, Alaska will conduct a research campaign Feb 27 - Mar 3, 2024.? Experiments are planned from approximately 0100 – 0800 UTC daily. ? Attached are the Transmission Notice and media image associated with this research campaign. -- Whitham D. Reeve Anchorage, Alaska USA --- |
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EUCARA25
The BAA Radio Astronomy Section together with RAL-Space are pleased to announce the 2025 EU Conference on Amateur Radio Astronomy.? EUCARA is a biannual conference starting in 2014 and this will be the first in the UK. The Harwell campus visitor centre will be the location in September 2025 for this weekend event.? The conference will include presentations from academic researchers, local amateurs, and students. We plan to have a poster session and demonstrations.? If you wish to register an interest in this event, please visit the EUCARA website (), where some information is already posted, and you can request to be kept updated on developments.? ?The event organisers are Paul Hearn and Andrew Thomas. The Radio? --???? Paul Hearn? ???? ?paul@...? ???? ?RA Section Director? ??? |
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NRK Grindavik back on air
开云体育I see that NRK on 37.5kHz made an appearance yesterday and today, despite the most recent eruption. It was timely as it recorded around a dozen SIDs from all the C-class flares. - see plot ? ? Mark ? |
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Interferometer - are these fringes from Sun?
开云体育Can anyone tell me whether the timing on the peaks below and the length of time from first to last peak is consistent with fringes from the Sun on my AD8302-based interferometer? ? Red is VPhase and blue is Vmax off AD8302 chip. 4m separation between dishes. 3 x SAWBird H1+ in series on each leg! I guess this is why the fringes, if that is hwat they are, are topping out at top. ? Andy ? ? ? Close-up: ? ? Andy |
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Re: X3 Flare observations 9 Feb
开云体育Phil - your observation was exactly what I would expect with such an intense flare. ? I have overlain your trace with mine for 23.4kHz and they are very similar. I don't now where you live but the skywave to groundwave phase difference must be similar to give the same effects. ? The so-called normal shark's fin only occurs if the X-ray flux rises rapidly and decays slowly and when the resulting drop in the ionosphere causes the sky wave to move into phase with the groundwave. Anything else will produce other shapes. ? Yours and mine traces show an inverted shark's fin at 10:22 caused by the C6.2 flare. In that case the skywave moved out of phase with the groundwave and so reduced the resulting amplitude. ? In the case of the X3.3 flare the ionosphere drop was so great that the skywave moved through the out-of-phase point back into phase, so producing a peak where you would expect a dip. ? Interestingly, if you invert the part of your trace that tried to go negative and attach it below the start of the SID, then invert the whole trace you get the "classic" shark's fin - see attached pic. ? Mark ? ? |
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Re: X3 Flare observations 9 Feb
A little late, I am just catching up.
Here is my SID and magnetometer trace from the 9th. A very sharp double dip on the VLF receivers with the signal from DHO dropping to the noise floor. Starting just before 1300 UTC. My estimate is that the event lasted 2 hours before the ionosphere bounced back to normal. Considerably longer than the real elapsed time for the flare The magnetometer showed a distinct c.20nT dip in Bx but nothing in By.? Nothing untoward on the muon counters relating to this event, although counts through the day appear to be about 5% higher than on the 8th. (I haven't actually added them up yet). All in, a very interesting event. -- -- Martyn |
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Re: X3 Flare observations 9 Feb
Hello, In light of the comments regarding the SID on 9 Feb I thought I would have a look at what I recorded. ?I have attached a screen shot for that day and I have recorded it - I think although its not the classic "sharks fin" I was told to look for. I'm using the standard set up of ?UKRAA VLF receiver tuned to 23.4khz (Ramsloh) and UKRAA ?antenna, using Radio Sky pipe on an old laptop. Phil H?
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Paul Hearn
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