Meteor fluxes and visual magnitudes from EISCAT radar event rates: a comparison with cross-section based magnitude estimates and optical data
International audience Incoherent scatter radars (ISR) are versatile instruments for continuous monitoring of ionisation processes in the Earth's atmosphere. EISCAT, The European Incoherent Scatter facility has proven effective also in meteor studies. The time resolution of the radar can be red...
Main Authors: | , , , |
---|---|
Other Authors: | , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
HAL CCSD
1998
|
Subjects: | |
Online Access: | https://hal.science/hal-00316473 https://hal.science/hal-00316473/document https://hal.science/hal-00316473/file/angeo-16-1475-1998.pdf |
id |
ftinsu:oai:HAL:hal-00316473v1 |
---|---|
record_format |
openpolar |
spelling |
ftinsu:oai:HAL:hal-00316473v1 2023-11-12T04:16:35+01:00 Meteor fluxes and visual magnitudes from EISCAT radar event rates: a comparison with cross-section based magnitude estimates and optical data Pellinen-Wannberg, A. Westman, A. Wannberg, G. Kaila, K. Swedish Institute of Space Physics Kiruna (IRF) EISCAT Scientific Association University of Oulu 1998 https://hal.science/hal-00316473 https://hal.science/hal-00316473/document https://hal.science/hal-00316473/file/angeo-16-1475-1998.pdf en eng HAL CCSD European Geosciences Union hal-00316473 https://hal.science/hal-00316473 https://hal.science/hal-00316473/document https://hal.science/hal-00316473/file/angeo-16-1475-1998.pdf info:eu-repo/semantics/OpenAccess ISSN: 0992-7689 EISSN: 1432-0576 Annales Geophysicae https://hal.science/hal-00316473 Annales Geophysicae, 1998, 16 (11), pp.1475-1485 [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences info:eu-repo/semantics/article Journal articles 1998 ftinsu 2023-10-25T16:25:36Z International audience Incoherent scatter radars (ISR) are versatile instruments for continuous monitoring of ionisation processes in the Earth's atmosphere. EISCAT, The European Incoherent Scatter facility has proven effective also in meteor studies. The time resolution of the radar can be reduced to a few milliseconds, sufficient to resolve the passage of individual meteors through the narrow ISR beam. Methods for group and phase velocity determination of the meteoroids and the discrepancy between the results related to the target behaviour are presented. The radar cross sections of echoes associated with moving meteoroids ("meteor head echoes") are very small and increase with decreasing wavelength. The parent meteoroids are found to have visual magnitudes far below the detection limit of most optical observations. The equivalent visual magnitude limit of the smallest objects observed by EISCAT in the current experiments has been estimated by two different methods, both from the cross-section measurements and from the measured event rates. Both methods give a limit value of +10 for the smallest objects while the upper limit is +4. The lower limit of the visual magnitude for the collocated optical measurement system is +4. Thus the two detection systems observe two different meteor size ranges, with the radar almost reaching micrometeorite population. Meteor fluxes estimated from the event rates and the radar system parameters agree well with previous extrapolated values for this size range. Article in Journal/Newspaper EISCAT Institut national des sciences de l'Univers: HAL-INSU |
institution |
Open Polar |
collection |
Institut national des sciences de l'Univers: HAL-INSU |
op_collection_id |
ftinsu |
language |
English |
topic |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
spellingShingle |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences Pellinen-Wannberg, A. Westman, A. Wannberg, G. Kaila, K. Meteor fluxes and visual magnitudes from EISCAT radar event rates: a comparison with cross-section based magnitude estimates and optical data |
topic_facet |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
description |
International audience Incoherent scatter radars (ISR) are versatile instruments for continuous monitoring of ionisation processes in the Earth's atmosphere. EISCAT, The European Incoherent Scatter facility has proven effective also in meteor studies. The time resolution of the radar can be reduced to a few milliseconds, sufficient to resolve the passage of individual meteors through the narrow ISR beam. Methods for group and phase velocity determination of the meteoroids and the discrepancy between the results related to the target behaviour are presented. The radar cross sections of echoes associated with moving meteoroids ("meteor head echoes") are very small and increase with decreasing wavelength. The parent meteoroids are found to have visual magnitudes far below the detection limit of most optical observations. The equivalent visual magnitude limit of the smallest objects observed by EISCAT in the current experiments has been estimated by two different methods, both from the cross-section measurements and from the measured event rates. Both methods give a limit value of +10 for the smallest objects while the upper limit is +4. The lower limit of the visual magnitude for the collocated optical measurement system is +4. Thus the two detection systems observe two different meteor size ranges, with the radar almost reaching micrometeorite population. Meteor fluxes estimated from the event rates and the radar system parameters agree well with previous extrapolated values for this size range. |
author2 |
Swedish Institute of Space Physics Kiruna (IRF) EISCAT Scientific Association University of Oulu |
format |
Article in Journal/Newspaper |
author |
Pellinen-Wannberg, A. Westman, A. Wannberg, G. Kaila, K. |
author_facet |
Pellinen-Wannberg, A. Westman, A. Wannberg, G. Kaila, K. |
author_sort |
Pellinen-Wannberg, A. |
title |
Meteor fluxes and visual magnitudes from EISCAT radar event rates: a comparison with cross-section based magnitude estimates and optical data |
title_short |
Meteor fluxes and visual magnitudes from EISCAT radar event rates: a comparison with cross-section based magnitude estimates and optical data |
title_full |
Meteor fluxes and visual magnitudes from EISCAT radar event rates: a comparison with cross-section based magnitude estimates and optical data |
title_fullStr |
Meteor fluxes and visual magnitudes from EISCAT radar event rates: a comparison with cross-section based magnitude estimates and optical data |
title_full_unstemmed |
Meteor fluxes and visual magnitudes from EISCAT radar event rates: a comparison with cross-section based magnitude estimates and optical data |
title_sort |
meteor fluxes and visual magnitudes from eiscat radar event rates: a comparison with cross-section based magnitude estimates and optical data |
publisher |
HAL CCSD |
publishDate |
1998 |
url |
https://hal.science/hal-00316473 https://hal.science/hal-00316473/document https://hal.science/hal-00316473/file/angeo-16-1475-1998.pdf |
genre |
EISCAT |
genre_facet |
EISCAT |
op_source |
ISSN: 0992-7689 EISSN: 1432-0576 Annales Geophysicae https://hal.science/hal-00316473 Annales Geophysicae, 1998, 16 (11), pp.1475-1485 |
op_relation |
hal-00316473 https://hal.science/hal-00316473 https://hal.science/hal-00316473/document https://hal.science/hal-00316473/file/angeo-16-1475-1998.pdf |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1782333642693935104 |