Re: [Utah-astronomy] Utah radio meteor obs report Jan 2010
Joe wrote:
[C]an you actually hear anything from the radio signals? That would be cool. Thanks, Joe
Joe, Under url - http://www.slas.us/gallery2/main.php?g2_itemId=2984 - there are three sample recorded meteor reflections. Press the "Download audio" to listen to the wave file on each item. http://www.slas.us/gallery2/main.php?g2_itemId=2988 http://www.slas.us/gallery2/main.php?g2_itemId=2791 http://www.slas.us/gallery2/main.php?g2_itemId=2984 Two of the three have been confirmed as meteor reflections by an RMOB network lead observer. The first one is relatively noise free, having been made in Jan 2010 after correcting a glitch in my antenna setup. The second and third recording were made in December and have more static. You can compare these to the standard Spaceweather-Air Force sample recording and live link to the Air Force Space Surveillance System antenna at Lake Kickapoo, Texas. http://spaceweatherradio.com/ (After click "Listen", click "Introduction: How to Get Started") About the Air Force Survelliance System http://en.wikipedia.org/wiki/Air_Force_Space_Surveillance_System The way counting and capturing is done, the counting-recording software (Spectrum Lab url: http://freenet-homepage.de/dl4yhf/spectra1.html ) is set to count and audio capture any signals that are more than a trigger value in decibals above the baseline static noise. In my case that is 18db for counting. Initially, I set the audio record capture between 18db to 25db and ended up capturing up to 700 or 800 meteor reflection sounds a week. That got boring pretty quickly, so now I have it set in "stand-down" mode at trigger capturing about 45db until the next major meteor in April. That captures above 10 audio files per week. If you have a five minute attention span on my receiver, you are guarenteed to one good reflection example about every 5 minutes during the daytime (as the apex-of-the-way transits Salt Lake City). At night, the 100% certainty detection period for a good reflection example is about 10 minutes. When the next major shower comes in April (the Lyrids), I'll flip the audio capture back to a lower setting and hopefully capture some shower associated meteor reflections sounds. I'll also be changing the spectral screen capture from 15 mins down to once a 1 second. That should get some spectral trace detail out of a Lyrid meteor trace - which happen on time scales of 0.2 seconds with 20 or 30 millisecond time resolution. Looking at the draft IMO calendar, there is a minor shower in Feb: alpha-Centaurids Active: January 28–February 21; Maximum: February 8, 05h30m UT (λo = 319 .2); zhr = 6.0 To correct my prior report: -------------- Date-UTHour Count Comments 20100103 20UT 145 Ursids peak 2010 6hr duration . . . Ursids peak readings: yyyymmddhh count 2010010316 90 -------------- - should have read - -------------- Date-UTHour Count Comments 20100103 20UT 145 Quadrantid peak 2010 6hr duration . . . Quadrantid peak readings: yyyymmddhh count 2010010316 90 -------------- Clear Skies - Kurt
I thought they would be cool and they are! Thank you. -- Joe ________________________________ From: Canopus56 <canopus56@yahoo.com> To: Utah Astronomy List Serv <utah-astronomy@mailman.xmission.com> Sent: Mon, February 1, 2010 1:18:22 PM Subject: Re: [Utah-astronomy] Utah radio meteor obs report Jan 2010 Joe wrote:
[C]an you actually hear anything from the radio signals? That would be cool. Thanks, Joe
Joe, Under url - http://www.slas.us/gallery2/main.php?g2_itemId=2984 - there are three sample recorded meteor reflections. Press the "Download audio" to listen to the wave file on each item. http://www.slas.us/gallery2/main.php?g2_itemId=2988 http://www.slas.us/gallery2/main.php?g2_itemId=2791 http://www.slas.us/gallery2/main.php?g2_itemId=2984 Two of the three have been confirmed as meteor reflections by an RMOB network lead observer. The first one is relatively noise free, having been made in Jan 2010 after correcting a glitch in my antenna setup. The second and third recording were made in December and have more static. You can compare these to the standard Spaceweather-Air Force sample recording and live link to the Air Force Space Surveillance System antenna at Lake Kickapoo, Texas. http://spaceweatherradio.com/ (After click "Listen", click "Introduction: How to Get Started") About the Air Force Survelliance System http://en.wikipedia.org/wiki/Air_Force_Space_Surveillance_System The way counting and capturing is done, the counting-recording software (Spectrum Lab url: http://freenet-homepage.de/dl4yhf/spectra1.html ) is set to count and audio capture any signals that are more than a trigger value in decibals above the baseline static noise. In my case that is 18db for counting. Initially, I set the audio record capture between 18db to 25db and ended up capturing up to 700 or 800 meteor reflection sounds a week. That got boring pretty quickly, so now I have it set in "stand-down" mode at trigger capturing about 45db until the next major meteor in April. That captures above 10 audio files per week. If you have a five minute attention span on my receiver, you are guarenteed to one good reflection example about every 5 minutes during the daytime (as the apex-of-the-way transits Salt Lake City). At night, the 100% certainty detection period for a good reflection example is about 10 minutes. When the next major shower comes in April (the Lyrids), I'll flip the audio capture back to a lower setting and hopefully capture some shower associated meteor reflections sounds. I'll also be changing the spectral screen capture from 15 mins down to once a 1 second. That should get some spectral trace detail out of a Lyrid meteor trace - which happen on time scales of 0.2 seconds with 20 or 30 millisecond time resolution. Looking at the draft IMO calendar, there is a minor shower in Feb: alpha-Centaurids Active: January 28–February 21; Maximum: February 8, 05h30m UT (λo = 319 .2); zhr = 6.0 To correct my prior report: -------------- Date-UTHour Count Comments 20100103 20UT 145 Ursids peak 2010 6hr duration . . . Ursids peak readings: yyyymmddhh count 2010010316 90 -------------- - should have read - -------------- Date-UTHour Count Comments 20100103 20UT 145 Quadrantid peak 2010 6hr duration . . . Quadrantid peak readings: yyyymmddhh count 2010010316 90 -------------- Clear Skies - Kurt _______________________________________________ Utah-Astronomy mailing list Utah-Astronomy@mailman.xmission.com http://mailman.xmission.com/cgi-bin/mailman/listinfo/utah-astronomy Visit the Photo Gallery: http://www.slas.us/gallery2/main.php Visit the Wiki: http://www.utahastronomy.com
participants (2)
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Canopus56 -
Joe Bauman