how is it done ? Meteor camera array - a wood box bolted to the Cave Astrola mount with six cameras - 2 on top, 2 at left, and 2 at right. The blade rotates at 13 revolutions per second giving 26 breaks per second in the meteor trails. The images are measured to compute the beginning and ending altitudes of the meteor trail. Click above to read 1 page on how it is done.
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Leonid meteor photographed with a 35mm camera in the array at left. Photo taken morning of 11/17/1998 from 3:50 to 4:00am MST. Pentax 135mm focal length lens at F/2.8 on Kodak Gold Max color film ASA 800. Measurements of 9 different Leonid trails on this date give a beginning altitude of 108 km, and ending altitude of 87 km; with a std. dev. of 4 km for both. The green color at top is due to atmospheric oxygen emission at 5577 Angstroms, and the red color at lower altitudes is from nitrogen emissions and the meteor itself. |
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29 days of radiometeor counts at 92.9 MHz for 11/03/2002 to 12/01/2002. The graph shows the large rise in Leonid meteors detected (by their reflection of FM radio waves) on Nov. 19th. The maximum was about 275 radio counts per hour. | |
24 hours of radiometeor counts for 11/19/2002 at 2 different FM frequencies (96.1 & 92.9 MHz). The 2 graphs show the Leonid meteor shower begins and ends at the same times, but the individual counts (and peaks) are different because the radio stations are at different azimuths. |
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