Re: History of Jodrell Bank
To All,
I think I found a way to get a free ticket to the Jodrell Bank Lecture on Wednesday Evening.
and / or
Regards,
Charley
On Sun, Oct 29, 2023 at 4:32?PM Charles Hill via <chillmf20= [email protected]> wrote: I am interested in listening into Mark Edwards presentation on the?
history of Jodrell Bank,
Has anyone seen a Zoom invite to his presentation?
If so, will you please share it with me?
Regards,
Charley Hill
On Tue, Oct 3, 2023 at 8:01?AM Mark Edwards < mark@...> wrote:
I'm told that the talk will be on Zoom and
also the Newcomen society's YouTube channel.
I'm hoping there isn't a rail strike so
that I can get there as their meeting tomorrow is affected by one!
?
Yes, I noticed that their events calendar
lists nothing beyond tomorrow's meeting, but they normally meet
on the first Wednesday of each month.
?
Mark
|
Re: History of Jodrell Bank
I am interested in listening into Mark Edwards presentation on the?
history of Jodrell Bank,
Has anyone seen a Zoom invite to his presentation?
If so, will you please share it with me?
Regards,
Charley Hill
On Tue, Oct 3, 2023 at 8:01?AM Mark Edwards < mark@...> wrote:
I'm told that the talk will be on Zoom and
also the Newcomen society's YouTube channel.
I'm hoping there isn't a rail strike so
that I can get there as their meeting tomorrow is affected by one!
?
Yes, I noticed that their events calendar
lists nothing beyond tomorrow's meeting, but they normally meet
on the first Wednesday of each month.
?
Mark
|
Re: Geomagnetic sine wave
Nothing on my Magnetometer in Coventry either. ? David ?
toggle quoted message
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From: [email protected] On Behalf Of Roger Blackwell GM4PMK
Sent: Thursday, October 26, 2023 9:41 AM
To: [email protected]
Subject: [baa-rag] Geomagnetic sine wave? A little late, I know - but just to say that neither my magnetometer or my VLF NRK records show any signs of that event. -- ? Roger Blackwell? GM4PMK ?
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A little late, I know - but just to say that
neither my magnetometer or my VLF NRK records show any signs of
that event.
--
Roger Blackwell GM4PMK
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Re: Geomagnetic sine wave
Hello,
??? ??? I did notice the space weather item, but my single axis sensor, 5 second samples did not record it. We have had PC3 waves reported once in the past, so I will have to dig deep in the records to find it. All observations welcome for the Radio Sky News summary.
Thanks,
John.
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On 19/10/2023 20:56, callum_potter wrote: If you click on the chart image, leads to a better version of the
charts where you can read the time of.
Cheers,
Callum
On Thu, Oct 19, 2023 at 8:27?PM Mark Edwards <mark@...> wrote:
I didn't see anything either to Grindavik.
Where did the time come from as it's not on that spaceweather page?
Mark
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Re: Geomagnetic sine wave
If you click on the chart image, leads to a better version of the
charts where you can read the time of.
Cheers,
Callum
toggle quoted message
Show quoted text
On Thu, Oct 19, 2023 at 8:27?PM Mark Edwards <mark@...> wrote:
I didn't see anything either to Grindavik.
Where did the time come from as it's not on that spaceweather page?
Mark
|
Re: Geomagnetic sine wave
I didn't see anything either to Grindavik.
?
Where did the time come from as it's not
on that spaceweather page?
?
Mark
|
Re: Geomagnetic sine wave
I wondered if anything was visible on the Grindavik VLF signal (37.5 kHz) but no.? Like Callum, I log at 10 second intervals but the raw data is not saved.
Paul Hyde
On Thursday, 19 October 2023 at 14:14:56 BST, callum_potter <callum.potter@...> wrote:
You might have noticed the item today on spaceweather.con about a sine
wave 'ring' in the magnetosphere, on the 17th October at about 16:50
UT.
I had a look at my magnetometer daily plot but at the normal scale
there was just a little fuzz. So I processed a subset of the raw data
and plotted that, and it does seem to show a regular undersampled sine
like variation (with a bit of imagination).
My measurement cadence is 10s, and with the signal period being around
25s I think this is the sort of thing to expect.
My magnetometer is also E-W orientation and maybe it might be more
pronounced in Z (or N-S).
I was wondering if any other magnetometer operators had noticed this.
Might be worth a look and replotting at higher resolution.
I had not realised such high-frequency phenomena existed - I think I
will increase the recording cadence to 1s or 2s to hopefully capture
these better in the future.
Hope this is of interest.
Callum
--
Callum Potter FRAS,
Fealquoy, Rousay, Orkney, Kw17 2PS
My astronomy website:
And on Substack:
And on twitter at:
|
Re: Geomagnetic sine wave
Thanks for posting Calum.? I have had a look at my data and no sine wave observed.?? --
???? Paul Hearn? ???? ? paul@...? ???? ?RA Section Director? ???
|
You might have noticed the item today on spaceweather.con about a sine
wave 'ring' in the magnetosphere, on the 17th October at about 16:50
UT.
I had a look at my magnetometer daily plot but at the normal scale
there was just a little fuzz. So I processed a subset of the raw data
and plotted that, and it does seem to show a regular undersampled sine
like variation (with a bit of imagination).
My measurement cadence is 10s, and with the signal period being around
25s I think this is the sort of thing to expect.
My magnetometer is also E-W orientation and maybe it might be more
pronounced in Z (or N-S).
I was wondering if any other magnetometer operators had noticed this.
Might be worth a look and replotting at higher resolution.
I had not realised such high-frequency phenomena existed - I think I
will increase the recording cadence to 1s or 2s to hopefully capture
these better in the future.
Hope this is of interest.
Callum
--
Callum Potter FRAS,
Fealquoy, Rousay, Orkney, Kw17 2PS
Tel. 07967 552211. callum.potter@...
My astronomy website:
And on Substack:
And on twitter at:
|
Square Kilometre Array Observatory at Jodrell Bank
Radio Astronomy Section Zoom Friday 6th October 2023 Square Kilometre Array Observatory at Jodrell Bank – an update and an innovative and a fun solution for hydrogen line reception Dr. Asayama Shinichiro
Video is now on YouTube?
?
You can find links to previous meeting videos and associated materials?
?
Kind Regards
John B
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Re: Successful detection and velocity calculation for galactic hydrogen using phased array
Dear Wolfgang,
Thank you very much for this offer of help – my latest data is available for you to look at on
This includes the software folder.
Unfortunately, my understanding of how data is constructed is virtually non-existent so I can’t explain that!
I understand if this means you can’t look at the data.
Perhaps instead you would look at my entries on website?
What I am looking for is an approach.
Andy
?
?
?
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From: [email protected] <[email protected]>
On Behalf Of messbetrieb via groups.io
Sent: 03 October 2023 15:03
To: [email protected]
Subject: Re: [baa-rag] Successful detection and velocity calculation for galactic hydrogen using phased array
?
Hi Andy,
I can give it a try. I may not always respond quickly due other tasks, though.
Can you send me a few of your observation files, i.e. single observations with a spectrum each? I understand that you record data from IF average. Since I usually don’t use this format
it would be helpful if you can send me a description of the data format.
Best regards,
Wolfgang
?
?
Von:
[email protected] <[email protected]>
Im Auftrag von Andrew Thornett via groups.io
Gesendet: Montag, 2. Oktober 2023 17:29
An: [email protected]
Betreff: Re: [baa-rag] Successful detection and velocity calculation for galactic hydrogen using phased array
?
Hi Wolfgang,
Any chance we could speak privately about how to reduce my data? I understand you are expert on this!
Andy
?
?
Thanks Wolfgang?
Andy,
Here are a couple of comments:
It would be helpful to know the characteristics of your antenna. Is there any technical documentation available which would give some numbers such as opening angle / gain?
Looking at the picture of the antenna is seems that the various elements are internally connected to provide a single port, so the antenna has a? fixed pattern. There may be one disadvantage: Since the coupling elements
will inevitably have some loss, this adds noise. For terrestrial applications for which the antenna was intended, this will not matter too much as the antenna will pick up thermal noise from the ground anyway. For astronomical applications, however, this may
be a disadvantage. Without knowing more details it is not possible to assess how much on an issue this might be.
The next thing I noticed is that you have a cable of maybe 1m length between the antenna port and the LNA. It would be better to have the LNA directly at the antenna port. The attenuation of the cable will introduce
noise which can be avoided.
I assume your spectra were taken with the antenna pointing straight upwards. It would be helpful to know the coordinates of your location and the time when the recording was taken in order to determine the sky location
where you were pointing.
If I interpret correctly your recording taken with ezRA, you have been recording at 1420 MHz with 2.6 MHz bandwidth and then displayed the total power in that band over time. In that case you would have received emission
from hydrogen plus a small contribution from the synchrotron radiation in the galactic plane. With small antennas you can only expect to see the hydrogen emission. In this case, it would be better to narrow the bandwidth to the range of the hydrogen spectrum
to increase you SNR. 500 kHz around 11420.4 MHz would be a good starting point. I don’t think you have actually as signal from the galactic plane in your plot.
As far as your signal at 1419.6 MHz is concerned, this would correspond to a redshift of ~ 170 km/s if it were hydrogen (you seem to have done something wrong in your calculation). ?Such velocities do not occur in our
galaxy, so this must be something else (or there was something weird with the frequency setting of your SDR).
?
?
Best regards,
Wolfgang
?
Von:
[email protected] <[email protected]>
Im Auftrag von Andrew Thornett via groups.io
Gesendet: Freitag, 29. September 2023 12:30
An: BAA RAG IO ONLINE GROUP <[email protected]>
Betreff: [baa-rag] Successful detection and velocity calculation for galactic hydrogen using phased array
?
I have summarised my progress so fsr on my website on URL below.
Please can you take a look - I am really keen to receive constructive comments and criticisms to help me improve the observations and also suggestions for what I do next..I would like to try to map the Milky Way but not
sure best way to go about this?
?
|
And here is the link
Must engage the brain next time!
Stephen
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Dear all
Following on from last Fridays fascinating talk, I've just found this Youtube video from Tech Minds describing his system, built from standard components off Amazon.
Balloons are optional.
Maybe of interest to some.
Regards
Stephen
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Homemade mount for Triffid 86x86cm array
Following my previous posts about the success of my attempts to detect hydrogen on 1420Mhz using Triffid military communications array 86 x 86cm in size, I have now constructed
a homemade wooden manual mount to allow me to vary pointing altitude.
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Re: RAZoom is back - Fri. Oct. 6th 19:30BST
The link has now been sent out.? If you did not receive it check your spam folder, and then contact me. --
???? Paul Hearn? ???? ? paul@...? ???? ?RA Section Director? ???
|
SMD muon Detector Soldering
If there is anyone who has experience with SMD soldering (0805? 2x1mm) and has the time to do 10 PCBs for UKRAA please contact me.? There are 23 components on each PCB.? We have some great volunteers already but could do with a couple more.?? Thanks. --
???? Paul Hearn? ???? ? paul@...? ???? ?RA Section Director? ???
|
Re: Successful detection and velocity calculation for galactic hydrogen using phased array
Hi Andy, I can give it a try. I may not always respond quickly due other tasks, though. Can you send me a few of your observation files, i.e. single observations with a spectrum each? I understand that you record data from IF average. Since I usually don’t use this format it would be helpful if you can send me a description of the data format. Best regards, Wolfgang ? ? Von: [email protected] <[email protected]> Im Auftrag von Andrew Thornett via groups.io
Gesendet: Montag, 2. Oktober 2023 17:29
An: [email protected]
Betreff: Re: [baa-rag] Successful detection and velocity calculation for galactic hydrogen using phased array ? Hi Wolfgang, Any chance we could speak privately about how to reduce my data? I understand you are expert on this! Andy ?
toggle quoted message
Show quoted text
From: [email protected] <[email protected]> On Behalf Of Andrew Thornett via groups.io
Sent: 29 September 2023 23:41
To: [email protected]
Subject: Re: [baa-rag] Successful detection and velocity calculation for galactic hydrogen using phased array? Thanks Wolfgang?
Andy, Here are a couple of comments: It would be helpful to know the characteristics of your antenna. Is there any technical documentation available which would give some numbers such as opening angle / gain? Looking at the picture of the antenna is seems that the various elements are internally connected to provide a single port, so the antenna has a? fixed pattern. There may be one disadvantage: Since the coupling elements will inevitably have some loss, this adds noise. For terrestrial applications for which the antenna was intended, this will not matter too much as the antenna will pick up thermal noise from the ground anyway. For astronomical applications, however, this may be a disadvantage. Without knowing more details it is not possible to assess how much on an issue this might be. The next thing I noticed is that you have a cable of maybe 1m length between the antenna port and the LNA. It would be better to have the LNA directly at the antenna port. The attenuation of the cable will introduce noise which can be avoided. I assume your spectra were taken with the antenna pointing straight upwards. It would be helpful to know the coordinates of your location and the time when the recording was taken in order to determine the sky location where you were pointing. If I interpret correctly your recording taken with ezRA, you have been recording at 1420 MHz with 2.6 MHz bandwidth and then displayed the total power in that band over time. In that case you would have received emission from hydrogen plus a small contribution from the synchrotron radiation in the galactic plane. With small antennas you can only expect to see the hydrogen emission. In this case, it would be better to narrow the bandwidth to the range of the hydrogen spectrum to increase you SNR. 500 kHz around 11420.4 MHz would be a good starting point. I don’t think you have actually as signal from the galactic plane in your plot. As far as your signal at 1419.6 MHz is concerned, this would correspond to a redshift of ~ 170 km/s if it were hydrogen (you seem to have done something wrong in your calculation). ?Such velocities do not occur in our galaxy, so this must be something else (or there was something weird with the frequency setting of your SDR). ? ? Best regards, Wolfgang ? Von: [email protected] <[email protected]> Im Auftrag von Andrew Thornett via groups.io
Gesendet: Freitag, 29. September 2023 12:30
An: BAA RAG IO ONLINE GROUP <[email protected]>
Betreff: [baa-rag] Successful detection and velocity calculation for galactic hydrogen using phased array ? I have summarised my progress so fsr on my website on URL below. Please can you take a look - I am really keen to receive constructive comments and criticisms to help me improve the observations and also suggestions for what I do next..I would like to try to map the Milky Way but not sure best way to go about this? ?
|
Re: History of Jodrell Bank
I'm told that the talk will be on Zoom and
also the Newcomen society's YouTube channel.
I'm hoping there isn't a rail strike so
that I can get there as their meeting tomorrow is affected by one!
?
Yes, I noticed that their events calendar
lists nothing beyond tomorrow's meeting, but they normally meet
on the first Wednesday of each month.
?
Mark
|
Re: History of Jodrell Bank
Hi Mark
Sounds interesting, is it being streamed or recorded?
Andrew Thomas
|
Paul Hearn
