|
Hard to explain meteor echo
开云体育We see a lot of strange echoes at but this one is particularly hard to explain.
The tail echo is? seen by NW H Vpol and the co-located test stream which beams vertically up and is in effect vertically polarised . So this tail echo appears to be linearly vertically polarised. With a Doppler shift of about -28Hz the reflection path length is extending at a constant rate of about? 167m/s or 540km/h. The tail echo which lasts for about 10 seconds is narrow ie is not spectrally spread. It is as if a rod like reflector is being carried in the wind and maintaining it's shape as it does so. Has anyone got a better explanation ? Brian |
|
Meteor echo of the day
开云体育A nice head echo seen by all 5 of the operational receivers but
with the tail echo only seen strongly by the receiver at the
Norman Lockyer observatory and weakly at Armagh. Note also the
different Doppler shifts observed from the different locations. The receiver marked "Test Stream"? is co-sited with the two NW
Hampshire receivers ( not as shown on the display ) and beams
vertically up. The other 2 receivers at NW Hampshire beam? into
the volume directly above the transmitter which is about 200km
away.? We are? still looking for I receiver site in Scotland to
provide coverage to the North of the beacon.? The receiver and
antenna will be provided free to Brian
|
|
Re: The new radio telescope and update at LRO
Hi, I've also purchased one of the solar cooker dishes for?RA application and I saw of course you had to spray paint the mirror surface. A suggestion had been made to apply more spray paint. So how many coats of paint did you finally wind up applying to the dish surface? Also are you contemplating attempting observations outside of the Hydrogen 1420 MHz frequency say possibly?for the?6.7 GHz methanol? masers and do you have any idea if this dish surface is adaptable for this higher frequency after the paint application.? Thanks -- Adrian "My God, it's full of stars!" |
|
Re: Postponed - RAZoom Fri. Nov. 8th 19:30
We received news last night that?Dr. Noel Castro-Segura was involved in a car accident.? He is OK but unable to present tonight.? We will reschedule this RAZOOM for next year.
We wish him a speedy recovery. --
???? Paul Hearn? ???? ?paul@...? ???? ?RA Section Director? ???
|
|
The new radio telescope and update at LRO
开云体育Hi All,
Here is the new addition at LRO (Lichfield Radio Obaervatory, www.astronomy.network) - this radio telescope is built using a 1.5m solar cooker dish. These cost around ?50 plus postage. The feed is my homemade hydrogen-tuned cantenna repurposed
but turning it around. Some hammering, sawing, screws and fence paint using ?5 worth of cheap off-cuts of wood from local hardware shop and I have a serviceable mount that allows elevation to be changed. The scope works by collecting drift scans so azimuth
does not need to be changed. A Nooelec SAWBird H1 LNA and RTL-SDR Blog SDR and cheap MINI PC from Ebay and Bob's your uncle = a fully functioning 1420MHz radio telescope.
After a bit of a competition using members of SARA and my local Rosliston Astronomy Group in Derbyshire, the telescope has been named Dishy McDishFace. For those of you who are aware of my other hydrogen line scope based on a 86cm ex-military
Ptarmigan 4x4 band 3 dipole array, that scope has been named The Signal Snatcher.
On another point, my laptop is now caught up completing a 3 day processing run on my hydrogen data over last 12 months using new settings in ezCon (part of ezRA - Easy Radio Astronomy suite by Ted Cline).
Andy
|
|
RAZoom Fri. Nov. 8th 19:30 GMTBinary Stars
BAA Radio Astronomy Section meeting.
?
Binary Stars and Stellar Cannibalism
Dr. Noel Castro-Segura University of Warwick Stars are the building blocks of the universe. The majority of the stars in our galaxy spend their lives associated with a stellar companion, bound by the gravitational pull between them. The population of so-called binary stars encompasses up to 80% of the stars in the galaxy, and approximately half of these systems have an orbital period short enough to induce mass transfer between the two celestial objects at some point in their evolution. This is a zoom meeting, the link will be sent out on Thursday 7th Nov. If you are not on our email distribution list please let me know.
?
Andrew Thomas is our host.
?
--
???? Paul Hearn? ???? ?paul@...? ???? ?RA Section Director? ???
|
|
Re: muon counts
开云体育Hello John Thanks for the info.? I have only just joined the BAA and cannot
yet log in ... that is being investigated.? Gamma rays, in
addition to producing Muons have an effect on the ionosphere. The
Live streams at are in
effect an instrument for looking at the state of the ionosphere at
6m wavelength. We see some echoes that are hard to explain as
meteor events. I have a library of screenshots of such events
taken by manual observation, I cannot spare the time for
systematic observations and automated capture is not yet available
on our system but the manually collected screenshots contain time
and date. So what I am looking for is a historical record of muon
detections to see if there is any correlation at all. I am still
fully occupied with the development of the meteor radar system so
cannot devote time to making my own muon detector system to
collect such data but was hoping that someone would have such
data. Here is an example of such an echo captured while typing this. Brian On 29/10/2024 08:29, John Cook wrote:
|
|
Meteor echo of the day
The attached screenshot? shows some interesting echoes of meteor events viewed from different directions and with different polarisations. Take a look for yourself .
The transmit beacon is due to be off for a time this week end, weather permitting, for it's planned move on the site of the new science centre at the Sherwood Observatory. See for it's operational status. Brian |
|
HAARP Transmission Notice for 15, 16 and 17 October 2024
HAARP will be operating UTC evenings through UTC midnight on 15, 16 and 17 October. A set of three fixed frequencies will be used, so they should be easy to spot in your spectrograms.
?
Please see the attached Notice of Transmission for details including how to send in your reception reports.
?
Good luck!
?
Whit
--
Whitham D. Reeve Anchorage, Alaska USA --- |
|
Meteor echo of the day
开云体育Hello Folks. While working on other things I have a second screen on my PC monitoring ? and if I see an interesting set of echoes I screen garb it using snipit and save it for later examination. Here is one captured this morning. Three of the receivers are
currently at the same NW Hampshire location including the test
stream which has an antenna pointing vertically up. We hope to
move one of the receivers to Scotland soon to add to the observed
reflection geometry.? Brian |
|
Re: X9 Flare 3/10/2024
开云体育The flare was also noted on the magnetometer here in Coventry. Very sharp onset in the magnetic field change. ? Davd Farn G4HRY ? |
|
Re: X9 Flare
I too saw the magnetic effect of this flare using a UKRAA MAgnetometer in Kent. I have been told that the sharp dip and recovery seen in the Inclination signal is called a magnetic crotchet due to its resenblance to the musical note. I have not seen an extended SID like dip as seen in the declination signal before.
Today the magnetometer is starting to move away from a quiet day profile. Aurora tonight?
|
A. C.
Tony Murphy
Paul Hearn
WReeve
