Forum Replies Created
-
Posts
-
On areturn triup to an Oz wedding, we had a stop over in Signapore. Fell asleep as soom as head hit the pillow. Woke up suprised to see through our 13th floor room, a (partial) solar eclipse underway. March 2016. The binoculars came in useful to record the event on the soft white pillow.
My neighbours thought the 1999 solar glasses gave the best experience … but many artistic colanderviews 🙂
Attachments:
I’ve used reversed binoculars i.e. objective lens pointing to sun and projected eclipse onto card in shade.
Looks like I’m going to be a bit lonely there
https://britastro.org/event/radio-astronomy-section-day-meetingI keep tabs on UKMon video Network for my radio meteor studies. So far for July they have had matched trajectories for 31 CAPs out of a total of 5884 matched events. The first CAP was identified on the 12th.
From what I’ve heard the video cameras did well on the 13th. The radio observations from Hayfield in Derbyshire are from scatter of the GRAVES transmitter near Dijon. This year’s counts are similar to lasts.
Attachments:
She is also due to speak at the Radio Astronomy Section sponsored European Conference on Amateur Radio Astronomy Group in September at RAL, Culham
The prolieration of satellites is also a big problem for Radio astronomy. In particular for radio meteoroid detection where there are many positive events mixed in with false positives.
Radio Meteoroid counts of back scatter at 143.05MHz on my 3 systems show a gently increasing count from 17th.
The data is for all streams though.
Clouds not a problem and I don’t think attenuation through falling snow is an issue 🙂Attachments:
Hi Andy,
“It could be useful for someone to add these to the main events page. Each meeting takes a bit of work to setup, so it is a non-trivial task to set them all up and maintain them. There is also a minor issue that as there are so many, setting them up would knock some other upcoming meetings off the list on the homepage. Something for the Web Ops Group to think about.”
Yes I agree that would be useful/
I use GRAVES transmitter and received 15 meteor events between 1430 and 1530 UTC yesterday, 20/3/21. The largest of these was at 15:07:19 and the signiture was that of an underdense meteor with a head-echo. The duration was 0.37 seconds. On a subjective assessment the recieved scatter signal was moderate for me in Derbyshire and nothing special.
Updated after seeing IMO page which makes it earlier than my event. I guess the geometry wasn’t rignt for scatter for my location.
Mark,
I too welcome the opportunity to compare methods and results. What is your location? I am in Hayfield in the Peak District. Here is my colour chart from one of the systems.
Filtering non-meteor events from the logged data is a tricky one; I select and reject using calculated characteristics of each event. For this system over 30% were rejected or which many were probably meteors.
I think one reason I may have relatively high count rates is because the FFT in the capture and logging program provides higher resolution in time (~10ms) rather than in frequency; this detects shorter duration meteors than, say, Spectrum Lab set-ups normally do.
The antennas in the vertical configuration do not utilse the maximum gain; I has mast head LNAs to provide a little boost to the signals.
Mike
Bill,
it is not part of windows it is an app that you should be able to find with a search enigine. I have sent a BAA email with the address.
Mike
Bill
I have had a PC and laptop used for RA stuff running 24/7 for 3 months or so – the secret is using something like “Stop Updates 10”; it does what it says!
With regard to the antennas, two are show in my picture, shown against a pink sunrise. They are, to give them their full title, cross polarisation 3 element LFA (Loop Fed Array) Yagis (Red and Green systems). The antennas are completely separate electrically. They point vertically and the elements point 45 degrees either side of GRAVES bearing. They are very much an experimental arrangement and the idea is that because the patterns in this orientation are ( I believe) akin to a dipole (exact modelling or measurement is a problem ) there is some direction discrimination. The other antenna is a 2 element LFA in traditional horizontal polarization configuration (Blue system). I am fairly sure GRAVES transmits vertical – certainly their recieving array are verticals so that would account for the better performance.
Mike
These are all interesting measurements Tracey and Bill. Also interesting the individual approaches we take to capture and display our data.
Here are counts from my three experimental antenna systems. On the 13th the highest count is in the hour starting 21:00 UT and on the 14th the peaks are in the hour from 23:00. (NB total counts without allowance for sporadics)
I note from the BAA Handbook the predicted maximum was 13th at 20:00 which I calculate as corresponding to a solar longitude of 261.995 which compares withe IMO listing of the 14th with solar longitude 262.2. (sorry, I can’t work back to UT) At my location the maximum radiant elevation was at around 02:00 UT on both days
Mike
Hayfield, High Peak
I have written a note this on event for my own records. It compares the video data with radio data. The results are useful but no firm conclusions can be drawn, so I won’t copy it here. However, if you are interested in the note and give me your email I will send it (I have shared it with a couple of observers already.)
Regards
Mike G
Interesting shots – keep them coming. Unfortunately radio meteor monitoring was alas off line at that time.
Mike
John,
As others have said, great idea. Will raise inerest in radio meteor observations. Great advestising for BAA-RAG – perhaps links to that website for practical how-to-do advice. BTW I even saw your water pump leap into action!
A banner running across the screen every so often with BAA-RAG link 🙂
