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Geminids

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About Geminids

  • Rank
    Nebula

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  • Location
    Hayfield, Derbyshire
  1. They look like good data. According to IMO information there are two showers that are at a maximum on 29 th July - Southern Delta Aquariids and Alpha Capricornids. (these have negative declinations - does that mean they are below the horizon and we don't see them?) They have Zenith Hourly Rates of 25 and 5 respectively . There is also the Perseids which were starting to become active on July 17th and going through to 12 August with ZHR of 100. Those results suprise me (nicely) for such Northerly monitoring; your background noise and interfence are probably good in such a remote(? ) place. Do you have a good line of sight over the sea?
  2. Hi Storm Chaser You've been running for a while now and I am wondering what kind of hourly count rates you've been getting in Stornaway?
  3. Do you have a balun on the antenna down lead? This can significantly reduce cable pick up. I use commerically available ferrite baluns from the company that supplied the antennas. I have found monitor screens are still picked up by antennas.
  4. It is nice to see the streaming data. I think I saw dim moon scatter at 1075 Hz. Where is 143.050 (zero Doppler for your RTL? Oh I can see on your clip it is at around 1065Hz. Your background noise looks quite steady with no nasty sproggies.
  5. Welsome back! That is a really strong one. Keep on with the study - all valuable information. ISS is one of the biggest targets we see but unfortunately I think, from memory, its orbit is limited to something like 51 deg N. I did start to think about other large satellites that come further N - and hence help map out the side lobes - but I was sidetacked on another project.
  6. According to the link below sporadic E contacts were highest 16:00 to 18:00 but still plenty of them between 18:00 and 20:00 UTC. https://www.mmmonvhf.de/es.php?year=2020&month=05&day=29 I learnt that mid-latitude sporadic E occurs between 100 and 120 km altitude (the altitudes we look for radio meteors) and is possibly casued by wind shear sweeping up long-lived metal ions from meteor disintegration. I haven't been able to ascertain whether VHF is refracted back or forward scattered? It seems a possible mode for GRAVES signals of the type and duration but I can't say (yet) if it is probable. It appears to be a different manifestation to that of tropo scatter. Any thoughts Mike
  7. That is very interesting - I was looking for some kind of ionospheric effect. I will have to think and take advice on how trhat may allow signals like that. Thanks
  8. A number of us who regularly monitor for meteors on the GRAVES radar frequency noticed an event at 29/05/2020 18:09:02 lasting here at Hayfield for almost four minutes, and with particularly high signal strength. Other than the long event there is no evidence on my records to identify it as a meteor. There is no head echo. The GRAVES pulses can be readily seen but apart from that there does not appear to be any general fading. Does this suggest high altitude with slow dispersion/recomination of the ionised cloud? How far wide spread was this seen? How strong (compared to avearge meteors) was the signal? Were there any space junk ionising the atmosphere.
  9. I had noticed these effect on a few days now and happened to be watching the radio waterfall rather than spectrum lab when it happened today again. The streaks turn out to be a source of wandering frequency local QRM I first noticed several years ago and had hoped it had gone away. As for the bright spots from what you say they are not the more distant QRM from Starlink! I will investigate further. Thanks for the information.
  10. Amongst my monitoring of daytime Arietids along came a herd of starlink satellites (I think). Two questions - has anyone seen the streaks that seem to be associated with the times of the bright events and how long before the herd are dispersed?
  11. Jeremy - thanks for the announcement - much appreciated
  12. Hallo Ian Out of interest do you know whether they were in the mainbeam or side/rear lobes of GRAVES? Mike Hayfield
  13. I think that the wavy signal you see is interference from electrical equipment as it warms up or the load changes. I was about to add "faulty" equipment but with the sensitive receivers we have nowadays and the "relaxed" view by the RFI enforcers it could be a RFI approved. If this is the first time you have seen it you are lucky. It would be nice to know something of your radio set up there, but it almost definitely wouldn't help (me at least) with identification. It could be sproggies (spurious signals from broadcast transmitters), emissions from computer monitor or TV or even the ever present "wall warts"
  14. This looks as if it might do the job. I need to get used to the jargon of TLEs and to convert ISS Azm and Elv to ground Lat and Long. I am checking a GRAVES recorded scatter from 20160729 that was verified at the time with ISS Tracker. At that time I had Time Lat Long 01:38:00 46.84 0.37 I have set the location to this Lat and Long and running the predictor (sat elevation >0 and min flare mag of 5.0) and using the current TLE (Keplers) the prediction is way, way off at 22.5N ~62E . For a LEO would I be right to assume this to be expected for that far back.
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