Hi Brian
I've just tried Firefox and Brave browsers and the live stream is working fine in both.
Many thanks
Stephen G4VBD

开云体育

As we approach the Lyrids there are lots of interesting echoes this morning.? I have had a report from someone who cannot access the live stream at all with some browsers. We know that Firefox doesn't appear to work with the live steam but are there any others ? Is it something to do with security settings ? see?? ? Your feedback would be appreciated.? Brian

开云体育

Today's screen grab? illustrates three phenomena that have been observed using the UK meteor beacon and receiver network. Firstly that the echoes can be directional so not seen by all the receivers in the network. Secondly that they can be linearly polarised again causing the echoes to be seen less well by some receivers and specifically seen at different strengths by co sited receivers with different , orthogonal, polarisations. The third phenomena observed is that one of the echoes exhibits wind shear in the region where the ionisation occurred giving rise to the extended Doppler shift of the tail echo.? These observations all suggest that the reflecting body is cylindrical and with a diameter that is small compared to the illuminating wavelength.?

Please make your own observations at ?? and let us know what you think.?

Brian

of the

开云体育

开云体育

开云体育

Mark - Nice plots! The eclipse effects are very pronounced and what I was expecting to see last October but didn't.

I'm setup with four virtual receivers (SDRduo) on the LF Comm frequencies and one (SDRdx) on the WWVB VLF frequency and started recording yesterday.

Based on past experience, each day is a new day when it comes to low frequency propagation. I usually see similar sunrise and sunset effects but not always, and daytime/nighttime signal levels vary all over the place. I'm not expecting anything different between now and Monday but one never knows.

Whit
--
Whitham D. Reeve
Anchorage, Alaska USA
---

开云体育

Mike,

Honestly I don't know. We could see soon, in April 8th?
Judging from Kiruna magnetometer historical data there was magnetic field disturbance on that day:

开云体育

Hi??ilvis,

That is an interesting group of measurements. ?I understand there will reduction in electrons during an eclipse. ?So, are the electron currents at satellite altitudes affecting the magnetic field?

Thanks for the interesting lecture!

My 2cents: there was a total eclipse in July 2009 and then I thought what is happening with Earth magnetic field during the event. So I made an screenshot from NOAA SWPC site then and attaching it now.?

These days dashboard is here:
https://www.swpc.noaa.gov/products/satellite-environment

Best regards,

?ilvis (LY2SS)

The link has been mailed out.? Let me know if you have not received it.......
--

---

???? Paul Hearn? ???? ?paul@...? ???? ?RA Section Director? ???

---

Sorry, just saw the 19:00 BST tutorial starts. OK for my time zone.
Thanks

Interested depending on the Mon. time of the tutorials.
Thanks

Data processing and visualisation of muon data using the Raspberry Pi

Starting Monday April 15th 19:00 BST -?Getting started with the Raspberry Pi?-? This will be the first of a series of Monday evening Zoom tutorials for the beginner led by Andrew Thomas and Richard Knott.? This first session will cover?connecting to the Raspberry Pi to a PC/Mac, file transfer, tools and applications.

The following weeks Rupert Powell (thank you to Roo) will be the instructor introducing Python and data processing using raw muon data. The Zoom link will be posted to this forum. If you have pre-tutorial questions these can be posted here.

There will be a Q & A opportunity at each session.
--

---

???? Paul Hearn? ???? ?paul@...? ???? ?RA Section Director? ???

---

开云体育

Today's screenshots are from Martin near Salisbury. The left hand screenshot is from Martin's own receiver system while the others are from the live stream. They show a tail echo lasting ten seconds or more with the spread of Doppler shifts indicating wind shear in the region where the additional ionisation occurred.? The observation from Armagh has a different perspective and hence shape on the display while the one from the Norman Lockyer observatory has only a slightly different perspective to that from the NW Hampshire receivers and they show little difference between Horizontal and Vertical polarisation. You can make your own screenshots of meteor echoes if you go to ?? Brian

We are pleased to welcome back Whit Reeve, a long time supporter of these seminars.
'October 14, 2023 Solar Eclipse ~ Effects on VLF Radio Propagation ~ Observed in Alaska USA' ~ Whitham D. Reeve.
Solar eclipses of one type or another occur a couple times each year on average. When the Sun’s radiation is blocked by the Moon, the characteristics of Earth’s ionosphere along the eclipse path change, and those changes affect radio propagation through that part of the ionosphere. Also, like the Sun’s visible light, its radio emissions detected by an observer in the eclipse path are reduced.?

The Zoom Room will be open from 19:30 BST, the link will be posted on Thursday 2nd. If you are not on the distribution list please contact me.
--

---

???? Paul Hearn? ???? ?paul@...? ???? ?RA Section Director? ???

---

开云体育

There was another set of weird echos earlier.