Teamleader : Tomislav Jurkic

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Teamleader Tomislav Jurkic
M E T E O R S
Members Izidor Pelajic Tamara Maric Anita
Stjepanovic
VSA 2004.
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GOALS

• Detecting and recording meteors using video,
  visual, radio, VLF and ULF method
• Photometry and light curve determination
• Video, radio and visual ZHR (zenithal hourly
  rate) determination
• Comparing data from ULF, VLF and video recording

VSA 2004.
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The elements of visual observing
Swift-Tuttle comet
Perseid meteor stream
Activity period 17.7-24.8.

• Maximum
• 11. 8. 21h UT (predicted by Lytinnen)
• 12. 8. 11h UT (regular)

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Video
RADIO
ULF
VLF
ELECTRO METER
CAMERA
YAGI ANTENNA
ANTENNA
CONDUCTING BALL
AMPLIFIER
RECEIVER
GRAPHIC CARD
FFT ANALYSIS
FFT ANALYSIS
VOLTAGE FOLLOWER
FILTER
OSCILOSCOPE
C O M P U T E R
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VIDEO OBSERVATION
½ CCD Camera WATEC minimum ilumination 0.0003
lux limiting magnitude 3,5
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RADIO OBSERVATION
Forward scattering method

• radio signal from distant emitter below horizon
  is not received normally
• when meteor passes, it forms plasma trail and
  radio signal is reflected and detected in receiver

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RADIO EQUIPMENT
Frequency 62,1888 MHz Emitter Flensburg (1300
km)
PCR1000 receiver USB mode, 3 kHz bandwidth
Yagi antenna
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ULF observation (below 50 Hz)
ELECTROMETER
VOLTAGE FOLLOWER
FILTER
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VLF observation
VLF RECEIVER Frequency 1 kHz
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FFT ANALYSIS
FFT fast Fourier transform
AMPLITUDE
FREQUENCY
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PHOTOMETRY

• 32 processed meteors
• 196 recorded meteors in 5 nights
• Photometry using Astro Image 2.0
• Measurement was done using 3x3 pixel aparture
  and mean pixel value

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ZHR - total
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ZHR - maximum
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PHOTOMETRIC TYPES
pixel value
pixel value
t (ms)
t (ms)
Type 2
Type 1
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pixel value
t (ms)
Type 3
Distribution of meteor curves type
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Type 1
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Type 2
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Type 3
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FIREBALL video
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FIREBALL LIGHT CURVE
pixel value
t (ms)
t (ms)
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FIREBALL radio and ULF
ULF signal Duration 930 min
Radio signal and spectar Duration 330 min
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CONCLUSION

• We recorded 196 meteors and processed 32 of them
• Radio, visual, and video ZHR measurements
  correspond very well with IMO measurements
• We found first predicted maximum at 139.45 solar
  longitude and at 139.9 solar longitude (regular
  maximum)
• We found out that the most meteors are type 2
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• We found possible ULF signal from bright
  fireball with video and radio record