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This page was last modified on August 13, 1997 by Peter Bus and Casper ter Kuile |
Perseids 1997: radio results
Peter Bus, Groningen
Forward-scatter observations of "sporadic" meteors in July-August 1997. Observer : Eisse Pieter Bus Location : Groningen, Netherlands (6 degr 33' E, 53 degr 13' N) Frequency : 72.11 MHz Transmitter Location : Wroclaw, Poland, 130 kW, Distance 740 km Antenna : Yagi, 3 elements, geographical azimuth 106 deg (ESE), elevation 13 degrees. Receiver : Bearcat UBC 177XLT Scanning Radio, sensitivity: 0.5 uV Observation method : Listening and counting in 5-minute intervals. Mean "sporadic" activity of long-duration reflections > 1 sec between 1997 July 6 and 1997 August 3. Between brackets the statistical error of one sigma (n-1). Hour rates starting at UTC: 6h00m 6h30m 7h00m 7h30m 8h00m 8h30m 9h00m 9h30m 20(4) 18(2) 17(2) 15(2) 14(3) 13(3) 13(3) 13(1) Mean "sporadic" activity between 1997 July 5 and 1997 August 2 1997. Between brackets the statistical error of one sigma (n-1). Hour rates starting at UTC: 16h00m 16h30m 17h00m 17h30m 18h00m 18h30m 19h00m 19h30m 74(15) 73(7) 73(12) 72(11) 73(12) 83(11) 91(7) 98(16) ============================================================================ Forward-scatter observations of Perseids on August 11 Observerver: Eisse Pieter Bus Location : Groningen, Netherlands (6 degr 33' E, 53 degr 13' N) Frequency : 72.11 MHz Transmitter Location : Wroclaw, Poland, 130 kW, Distance 740 km Antenna : Yagi, 3 elements, geographical azimuth 106 deg (ESE), elevation 13 degrees. Receiver : Bearcat UBC 177XLT Scanning Radio, sensitivity: 0.5 uV Observation method : Listening and counting in 5-minute intervals. Preliminary results Perseid activity of long-duration reflections > 1 sec (visual bright Meteors). Between brackets one-sigma errors with the errors of sporadic activity taken into account. Hour rates starting at UTC: 6h00m 6h30m 7h00m 7h30m 8h00m 8h30m 9h00m 9h30m 26(6) 26(5) 33(6) 33(6) 40(7) no data 36(7) 40(7) ========================================================================= Forward-scatter observations of Perseids on August 12 Observerver: Eisse Pieter Bus Location : Groningen, Netherlands (6 degr 33' E, 53 degr 13' N) Frequency : 72.11 MHz Transmitter Location : Wroclaw, Poland, 130 kW, Distance 740 km Antenna : Yagi, 3 elements, geographical azimuth 106 deg (ESE), elevation 13 degrees. Receiver : Bearcat UBC 177XLT Scanning Radio, sensitivity: 0.5 uV Observation method : Listening and counting in 5-minute intervals. Preliminary results Maximum of the "New" peak of the Perseids observed at Solar Longitude 139.69. Perseid activity of long-duration reflections > 1 sec (visual bright meteors). Only corrected for 'dead-time' *) and 'sporadics'. Between brackets one-sigma errors with the errors of sporadic activity taken into account. Perseid Hour rates starting at UTC: 6h00m 6h30m 7h00m 7h30m 8h00m 8h30m 9h00m 9h30m 13(5) 38(6) 42(7) 72(9) 106(11) 43(7) 29(6) 24(5) Maximum is observed at Solar Longitude 139.69. In 1995 the Radio maximum was at 139.65 and in 1996 at 139.67 (2000.0). *) Dead-time marks the period in which a signal of certain amplitude may mask other signals of lesser amplitude. The dead-time corrections were applied according to the "Geiger-counter method" ====================================================================== Forward-scatter observations of Perseids on August 12 Observer : Eisse Pieter Bus Location : Groningen, Netherlands (6 degr 33' E, 53 degr 13' N) Frequency : 72.11 MHz Transmitter Location : Wroclaw, Poland, 130 kW, Distance 740 km Antenna : Yagi, 3 elements, geographical azimuth 106 deg (ESE), elevation 13 degrees. Receiver : Bearcat UBC 177XLT Scanning Radio, sensitivity: 0.5 uV Observation method : Listening and counting in 5-minute intervals. Preliminary results Radio maximum of the "Traditional" peak of the Perseids observed at Solar Longitude 140.10 degrees (2000.0) Perseid activity of all reflections. Only corrected for 'dead-time' *) and 'sporadics'. Between brackets one-sigma errors with the errors of sporadic activity taken into account. Perseid Hour rates starting at UTC: 16h00m 16h30m 17h00m 17h30m 18h00m 18h30m 19h00m 19h30m 68(17) 63(11) 61(14) 78(14) 113(16) 71(14) 61(10) 38(17) Maximum is observed at Solar Longitude 140.10 degrees. Radio maximum in 1996 observed at Solar Longitude 140.09 degrees. *) Dead-time marks the period in which a signal of certain amplitude may mask other signals of lesser amplitude. The dead-time corrections were applied according to the "Geiger-counter method" ====================================================================== Forward-scatter observations of Perseids on August 13 Observer : Eisse Pieter Bus Location : Groningen, Netherlands (6 degr 33' E, 53 degr 13' N) Frequency : 72.11 MHz Transmitter Location : Wroclaw, Poland, 130 kW, Distance 740 km Antenna : Yagi, 3 elements, geographical azimuth 106 deg (ESE), elevation 13 degrees. Receiver : Bearcat UBC 177XLT Scanning Radio, sensitivity: 0.5 uV Observation method : Listening and counting in 5-minute intervals. Preliminary results Perseid activity of long-duration-reflections >1 second. Only corrected for 'dead-time' *) and 'sporadics'. Between brackets one-sigma errors with the errors of sporadic activity taken into account. Perseid Hour rates starting at UTC: 6h00m 6h30m 7h00m 7h30m 8h00m 8h30m 9h00m 9h30m 26(6) 20(5) 19(5) 21(5) 12(5) 13(5) 15(5) 28(5) Unfavourable antenna-geometry for Perseids untill 8h30m UT. The increasing activity of the Perseids after 9h UT is probably artifical caused by increasing favourable antenna-geometry. *) Dead-time marks the period in which a signal of certain amplitude may mask other signals of lesser amplitude. The dead-time corrections were applied according to the "Geiger-counter method"
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This page was last modified on August 13, 1997 by Peter Bus and Casper ter Kuile |