Velocities of auroral coherent echoes at 12 and 144 MHz
Two Doppler coherent radar systems are currently working at Hankasalmi, Finland, the STARE and CUTLASS radars operating at ~144 MHz and ~12 MHz, respectively. The STARE beam 3 is nearly co-located with the CUTLASS beam 5, providing an opportunity for echo velocity comparison along the same direction...
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ftleicesterunfig:oai:figshare.com:article/10163153 2023-05-15T16:04:37+02:00 Velocities of auroral coherent echoes at 12 and 144 MHz A. V. Koustov D. W. Danskin M. V. Uspensky T. Ogawa P. Janhunen N. Nishitani S. Nozawa M. Lester S. Milan 2002-10-31T00:00:00Z https://figshare.com/articles/journal_contribution/Velocities_of_auroral_coherent_echoes_at_12_and_144_MHz/10163153 unknown 2381/39277 https://figshare.com/articles/journal_contribution/Velocities_of_auroral_coherent_echoes_at_12_and_144_MHz/10163153 All Rights Reserved Uncategorized Science & Technology Physical Sciences Astronomy & Astrophysics Geosciences Multidisciplinary Meteorology & Atmospheric Sciences Geology ionosphere ionospheric irregularities plasma waves and instabilities auroral ionosphere ELECTRON-DRIFT VELOCITY F-REGION IRREGULARITIES ASPECT ANGLE DEPENDENCE IONOSPHERIC E-REGION KINETIC-THEORY PLASMA-WAVES RADAR INSTABILITY BACKSCATTER EISCAT Text Journal contribution 2002 ftleicesterunfig 2021-11-11T19:36:46Z Two Doppler coherent radar systems are currently working at Hankasalmi, Finland, the STARE and CUTLASS radars operating at ~144 MHz and ~12 MHz, respectively. The STARE beam 3 is nearly co-located with the CUTLASS beam 5, providing an opportunity for echo velocity comparison along the same direction but at significantly different radar frequencies. In this study we consider an event when STARE radar echoes are detected at the same ranges as CUT-LASS radar echoes. The observations are complemented by EISCAT measurements of the ionospheric electric field and electron density behaviour at one range of 900 km. Two separate situations are studied; for the first one, CUTLASS observed F-region echoes (including the range of the EIS-CAT measurements), while for the second one CUTLASS observed E-region echoes. In both cases STARE E-region measurements were available. We show that F-region CUT-LASS velocities agree well with the convection component along the CUTLASS radar beam, while STARE velocities are typically smaller by a factor of 2–3. For the second case, STARE velocities are found to be either smaller or larger than CUTLASS velocities, depending on the range. Plasma physics of E-and F-region irregularities is discussed in attempt to explain the inferred relationship between various velocities. Special attention is paid to ionospheric refraction that is important for the detection of 12-MHz echoes. Other Non-Article Part of Journal/Newspaper EISCAT University of Leicester: Figshare |
institution |
Open Polar |
collection |
University of Leicester: Figshare |
op_collection_id |
ftleicesterunfig |
language |
unknown |
topic |
Uncategorized Science & Technology Physical Sciences Astronomy & Astrophysics Geosciences Multidisciplinary Meteorology & Atmospheric Sciences Geology ionosphere ionospheric irregularities plasma waves and instabilities auroral ionosphere ELECTRON-DRIFT VELOCITY F-REGION IRREGULARITIES ASPECT ANGLE DEPENDENCE IONOSPHERIC E-REGION KINETIC-THEORY PLASMA-WAVES RADAR INSTABILITY BACKSCATTER EISCAT |
spellingShingle |
Uncategorized Science & Technology Physical Sciences Astronomy & Astrophysics Geosciences Multidisciplinary Meteorology & Atmospheric Sciences Geology ionosphere ionospheric irregularities plasma waves and instabilities auroral ionosphere ELECTRON-DRIFT VELOCITY F-REGION IRREGULARITIES ASPECT ANGLE DEPENDENCE IONOSPHERIC E-REGION KINETIC-THEORY PLASMA-WAVES RADAR INSTABILITY BACKSCATTER EISCAT A. V. Koustov D. W. Danskin M. V. Uspensky T. Ogawa P. Janhunen N. Nishitani S. Nozawa M. Lester S. Milan Velocities of auroral coherent echoes at 12 and 144 MHz |
topic_facet |
Uncategorized Science & Technology Physical Sciences Astronomy & Astrophysics Geosciences Multidisciplinary Meteorology & Atmospheric Sciences Geology ionosphere ionospheric irregularities plasma waves and instabilities auroral ionosphere ELECTRON-DRIFT VELOCITY F-REGION IRREGULARITIES ASPECT ANGLE DEPENDENCE IONOSPHERIC E-REGION KINETIC-THEORY PLASMA-WAVES RADAR INSTABILITY BACKSCATTER EISCAT |
description |
Two Doppler coherent radar systems are currently working at Hankasalmi, Finland, the STARE and CUTLASS radars operating at ~144 MHz and ~12 MHz, respectively. The STARE beam 3 is nearly co-located with the CUTLASS beam 5, providing an opportunity for echo velocity comparison along the same direction but at significantly different radar frequencies. In this study we consider an event when STARE radar echoes are detected at the same ranges as CUT-LASS radar echoes. The observations are complemented by EISCAT measurements of the ionospheric electric field and electron density behaviour at one range of 900 km. Two separate situations are studied; for the first one, CUTLASS observed F-region echoes (including the range of the EIS-CAT measurements), while for the second one CUTLASS observed E-region echoes. In both cases STARE E-region measurements were available. We show that F-region CUT-LASS velocities agree well with the convection component along the CUTLASS radar beam, while STARE velocities are typically smaller by a factor of 2–3. For the second case, STARE velocities are found to be either smaller or larger than CUTLASS velocities, depending on the range. Plasma physics of E-and F-region irregularities is discussed in attempt to explain the inferred relationship between various velocities. Special attention is paid to ionospheric refraction that is important for the detection of 12-MHz echoes. |
format |
Other Non-Article Part of Journal/Newspaper |
author |
A. V. Koustov D. W. Danskin M. V. Uspensky T. Ogawa P. Janhunen N. Nishitani S. Nozawa M. Lester S. Milan |
author_facet |
A. V. Koustov D. W. Danskin M. V. Uspensky T. Ogawa P. Janhunen N. Nishitani S. Nozawa M. Lester S. Milan |
author_sort |
A. V. Koustov |
title |
Velocities of auroral coherent echoes at 12 and 144 MHz |
title_short |
Velocities of auroral coherent echoes at 12 and 144 MHz |
title_full |
Velocities of auroral coherent echoes at 12 and 144 MHz |
title_fullStr |
Velocities of auroral coherent echoes at 12 and 144 MHz |
title_full_unstemmed |
Velocities of auroral coherent echoes at 12 and 144 MHz |
title_sort |
velocities of auroral coherent echoes at 12 and 144 mhz |
publishDate |
2002 |
url |
https://figshare.com/articles/journal_contribution/Velocities_of_auroral_coherent_echoes_at_12_and_144_MHz/10163153 |
genre |
EISCAT |
genre_facet |
EISCAT |
op_relation |
2381/39277 https://figshare.com/articles/journal_contribution/Velocities_of_auroral_coherent_echoes_at_12_and_144_MHz/10163153 |
op_rights |
All Rights Reserved |
_version_ |
1766400228366221312 |