On the VHF radar echoes in the region of midnight aurora: Signs of ground echoes modulated by the ionosphere
We present all-sky interferometric meteor radar (MR), VHF (36.9 MHz), observations from Sodankylä Geophysical Observatory and report on the unusual echoes, which were detected at low elevation on the northern horizon, typically during substorms. These echoes have a near-zero Doppler shift, relativel...
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ftleicesterunfig:oai:figshare.com:article/10180949 2023-05-15T16:04:42+02:00 On the VHF radar echoes in the region of midnight aurora: Signs of ground echoes modulated by the ionosphere A. Kozlovsky Mark Lester 2015-03-03T00:00:00Z https://figshare.com/articles/journal_contribution/On_the_VHF_radar_echoes_in_the_region_of_midnight_aurora_Signs_of_ground_echoes_modulated_by_the_ionosphere/10180949 unknown 2381/32823 https://figshare.com/articles/journal_contribution/On_the_VHF_radar_echoes_in_the_region_of_midnight_aurora_Signs_of_ground_echoes_modulated_by_the_ionosphere/10180949 All Rights Reserved Uncategorized Science & Technology Physical Sciences Astronomy & Astrophysics Meteor radar Radar ground scatter Pulsating aurora BACKSCATTER SUPERDARN WAVES EISCAT STARE Text Journal contribution 2015 ftleicesterunfig 2021-11-11T19:51:49Z We present all-sky interferometric meteor radar (MR), VHF (36.9 MHz), observations from Sodankylä Geophysical Observatory and report on the unusual echoes, which were detected at low elevation on the northern horizon, typically during substorms. These echoes have a near-zero Doppler shift, relatively low power, but with a sharp rise to the power peak, short lifetime (less than 2 s), and nonexponential decay (NED). We suggest that such auroral NED echoes are in fact ground backscatter of the MR waves which have been refracted in the ionosphere, passing through the ionosphere in the substorm region, where pulsating aurora (at a frequency higher than 1.7 Hz) occurs and causes quasiperiodic modulation of the wave propagation conditions, which leads to corresponding modulation of the amplitude of return. The MR treats such oscillating signal as meteor trails. Other Non-Article Part of Journal/Newspaper EISCAT Sodankylä University of Leicester: Figshare Sodankylä ENVELOPE(26.600,26.600,67.417,67.417) |
institution |
Open Polar |
collection |
University of Leicester: Figshare |
op_collection_id |
ftleicesterunfig |
language |
unknown |
topic |
Uncategorized Science & Technology Physical Sciences Astronomy & Astrophysics Meteor radar Radar ground scatter Pulsating aurora BACKSCATTER SUPERDARN WAVES EISCAT STARE |
spellingShingle |
Uncategorized Science & Technology Physical Sciences Astronomy & Astrophysics Meteor radar Radar ground scatter Pulsating aurora BACKSCATTER SUPERDARN WAVES EISCAT STARE A. Kozlovsky Mark Lester On the VHF radar echoes in the region of midnight aurora: Signs of ground echoes modulated by the ionosphere |
topic_facet |
Uncategorized Science & Technology Physical Sciences Astronomy & Astrophysics Meteor radar Radar ground scatter Pulsating aurora BACKSCATTER SUPERDARN WAVES EISCAT STARE |
description |
We present all-sky interferometric meteor radar (MR), VHF (36.9 MHz), observations from Sodankylä Geophysical Observatory and report on the unusual echoes, which were detected at low elevation on the northern horizon, typically during substorms. These echoes have a near-zero Doppler shift, relatively low power, but with a sharp rise to the power peak, short lifetime (less than 2 s), and nonexponential decay (NED). We suggest that such auroral NED echoes are in fact ground backscatter of the MR waves which have been refracted in the ionosphere, passing through the ionosphere in the substorm region, where pulsating aurora (at a frequency higher than 1.7 Hz) occurs and causes quasiperiodic modulation of the wave propagation conditions, which leads to corresponding modulation of the amplitude of return. The MR treats such oscillating signal as meteor trails. |
format |
Other Non-Article Part of Journal/Newspaper |
author |
A. Kozlovsky Mark Lester |
author_facet |
A. Kozlovsky Mark Lester |
author_sort |
A. Kozlovsky |
title |
On the VHF radar echoes in the region of midnight aurora: Signs of ground echoes modulated by the ionosphere |
title_short |
On the VHF radar echoes in the region of midnight aurora: Signs of ground echoes modulated by the ionosphere |
title_full |
On the VHF radar echoes in the region of midnight aurora: Signs of ground echoes modulated by the ionosphere |
title_fullStr |
On the VHF radar echoes in the region of midnight aurora: Signs of ground echoes modulated by the ionosphere |
title_full_unstemmed |
On the VHF radar echoes in the region of midnight aurora: Signs of ground echoes modulated by the ionosphere |
title_sort |
on the vhf radar echoes in the region of midnight aurora: signs of ground echoes modulated by the ionosphere |
publishDate |
2015 |
url |
https://figshare.com/articles/journal_contribution/On_the_VHF_radar_echoes_in_the_region_of_midnight_aurora_Signs_of_ground_echoes_modulated_by_the_ionosphere/10180949 |
long_lat |
ENVELOPE(26.600,26.600,67.417,67.417) |
geographic |
Sodankylä |
geographic_facet |
Sodankylä |
genre |
EISCAT Sodankylä |
genre_facet |
EISCAT Sodankylä |
op_relation |
2381/32823 https://figshare.com/articles/journal_contribution/On_the_VHF_radar_echoes_in_the_region_of_midnight_aurora_Signs_of_ground_echoes_modulated_by_the_ionosphere/10180949 |
op_rights |
All Rights Reserved |
_version_ |
1766400313440337920 |