Meteoroid Streams at Earth Detected by the Canadian Meteor Orbit Radar

Details Meteoroid Streams at Earth Detected by the Canadian Meteor Orbit Radar Meteoroid Streams at Earth Detected by the Canadian Meteor Orbit Radar

Oct 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007dps....39.5905b&link_type=abstract

American Astronomical Society, DPS meeting #39, #59.05; Bulletin of the American Astronomical Society, Vol. 39, p.535

Astronomy and Astrophysics

Astronomy

Scientific paper

The Canadian Meteor Orbit Radar (CMOR) is a multi-frequency backscatter meteor radar which has been in routine operation since 1999, with an orbit measurement capability since 2002. In total, CMOR has measured over 5 million orbits of meteoroids with masses greater than 10 micrograms, while recording more than 20 million meteor echoes in total to mid-2007. We have applied a two stage comparative technique for identifying meteor showers in CMOR data. In the first stage, showers are delineated using single station echo directions to compute apparent radiant activity per degree of solar longitude. A second stage employs quasi 3D wavelet transforms to examine clustering of individually measured geocentric radiants and velocities based on measured orbits detected per degree of solar longitude. From this analysis we have identified 44 annual minor and major meteor showers with high reliability. A dozen of these showers are previously unreported in the literature. We find that several streams reported as distinct in the literature are in fact continuously active over long time periods. Most prominent among these are the Iota Aquariid /Piscid / Taurid showers of August - November all of which are part of one stream linked to the broad 2P/Encke meteoroid complex. Several of our newly reported streams occur in regions of aei space with few or no obvious parent bodies. In particular, many streams have i 90 degs and a 1 AU with e > 0.6. These showers are rich in faint meteors and suggestive of evolutionary processes driven by Poynting-Robertson drag separating meteoroids from original parent body orbits. We also report details from our radar survey of a number of newly recognized cometary dust trails which intersect the Earth defining orbital elements of unrecognized potentially hazardous comets or extinct cometary nuclei.

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