February 4, 2008 1235 UT ( 5:25 am MST )
The sky was cloudy with snow most of the night but this fireball happily
passed through a thinner patch of clouds and into view.
Interesting to note that this specimen made a relatively small radio reflection
compared to its size as seen on the
spectrograph above during the 1235 UT minute. There seems to be a pattern
fireballs making small or even neglible forward scatter reflections.
1.6 MB 29 seconds
( full duration
of forward scatter reflection )
Listen with headphones or good stereo speakers to the sonic detail if
Note : Top half of spectrograph above is 61.250 MHz reception, below the
white line is 83.250 MHz reception.
Radio Fireball Observatory
35.50 N 105.89 W
Here are a few movies and a full archive is coming in the near future.
Note movies are primarily in .mp4 format which requires Quicktime 7.
A free Quicktime 7 player is available at: http://www.apple.com/quicktime/download/
Headphones highly recommended for fine detail of sound and doppler effects.
Method and Equipment
Briefly, here is my fireball observation and capture method as developed
thus far. It is a work in progress.
VIDEO: I am visually recording the whole sky from dusk to dawn at 30 frames
per second with a video camera (a HiCam HB-710E, Rainbow L163VDC4P fisheye
lens ) into an iMac.
The video stream comes from the camera and passes through a Canopus ADVC110
which converts the video signal to DV and then enters the Mac via firewire.
RADIO: I am recording audio in stereo to two separate forward scatter
channels using video carriers from tv channel 3 ( 61.250 MHz ) and tv channel
6 ( 83.250 MHz).
Radios are ICOM PCR-1000 operating in CW mode with separate antennas.
CHARTING: I am splitting the two forward scatter signals into SpectrumLab
which serves as the audio chart recorder 24 hours a day.
METHOD: I go through the night's SpectrumLab charts and look for
any prominent meteor scatter reflections and then go to that time point on
the night's video capture to
check to see if there is a local fireball capture. If there is
an interesting fireball I extract the movie clip from the time of the head
echo to the end of the reflection.
More information on the forward scatter radio method here:
Foe access to Heliotown click button below: