5:45 PM - 5:48 PM
[PEM06-P01] Observation of Ozone concentration relation to meteors echo duration distributions by a forward scattering radar
3-min talk in an oral session
Keywords:Ozone concentration, meteors, forward scattering, radar, mesosphere
At Kochi University of Technology (KUT) we attempted to observe the knee position in selected meteor showers. The 5 channel HRO interferometer radar developed at KUT utilizes forward scattering of 53.75 MHz continuous radio signals emitted from Sabae station, Fukui prefecture, Japan (Fukui National College of Technology: FNCT) at a distance of 340 km from Kochi prefecture. The software HROFFT (Ham-band Radio meteor Observation Fast Fourier Transform) generates spectrogram images for meteor echoes in 10 minute intervals. These images are used by the developed auto counting software Meteor echo counter through image processing to automatically count meteor echoes and their durations. The critical duration T at which the drop occurs in long echoes counts can be indicative about the Ozone concentration by the relation derived by McIntosh and Hajduk (1977): O_3=(αT)^(-1). As currently there is no developed mechanism for meteor height determination at KUT, the scope is focused on the analysis of meteor echoes duration, detection of the knee point and then finally comparing the ozone concentration measurements to the results of similar studies.
BAGGALEY, W.J. and CUMMACK, C.H., (1974): Meteor train ion chemistry. J. Atmos. Terr. Phys. 36, 1759
CEVOLANI, G and PUPILLO, G (2003): Ground-based radio observations to probe the ozone content in the meteor region, Annals of Geophysics, 46. 247-258
JONES, J.MCINTOSH, B.A & SIMEK, M. (1990): Ozone and the duration of overdense radio meteors. J. atmos. terr. Phys. 52, 253.
MCINTOSH, B.A. and A.HAJDUK (1977): Sunrise effect on persistent radar echoes from sporadic meteors, Bull. Astron. Inst.Czechosl., 28, 280-285.