Imaging radar observations of Farley Buneman waves during the JOULE II experiment
Vector electric fields and associated <I><B>E</B></I>×<I><B>B</B></I> drifts measured by a sounding rocket in the auroral zone during the NASA JOULE II experiment in January 2007, are compared with coherent scatter spectra measured by a 30...
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Series: | Annales Geophysicae |
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doaj-6b06e539fbe14e6595eb859c54954d852020-11-24T23:59:03ZengCopernicus PublicationsAnnales Geophysicae0992-76891432-05762008-07-01261837185010.5194/angeo-26-1837-2008Imaging radar observations of Farley Buneman waves during the JOULE II experimentD. L. Hysell0G. Michhue1M. F. Larsen2R. Pfaff3M. Nicolls4C. Heinselman5H. Bahcivan6Earth and Atmospheric Sciences, Cornell University, Ithaca, NY, USAEarth and Atmospheric Sciences, Cornell University, Ithaca, NY, USADepartment of Physics, Clemson University, Clemson, SC, USANASA Goddard Space Flight Center, Greenbelt, MD, USASRI International, Menlo Park, CA, USASRI International, Menlo Park, CA, USASRI International, Menlo Park, CA, USAVector electric fields and associated <I><B>E</B></I>×<I><B>B</B></I> drifts measured by a sounding rocket in the auroral zone during the NASA JOULE II experiment in January 2007, are compared with coherent scatter spectra measured by a 30 MHz radar imager in a common volume. Radar imaging permits precise collocation of the spectra with the background electric field. The Doppler shifts and spectral widths appear to be governed by the cosine and sine of the convection flow angle, respectively, and also proportional to the presumptive ion acoustic speed. The neutral wind also contributes to the Doppler shifts. These findings are consistent with those from the JOULE I experiment and also with recent numerical simulations of Farley Buneman waves and instabilities carried out by Oppenheim et al. (2008). Simple linear analysis of the waves offers some insights into the spectral moments. A formula relating the spectral width to the flow angle, ion acoustic speed, and other ionospheric parameters is derived.https://www.ann-geophys.net/26/1837/2008/angeo-26-1837-2008.pdf |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
D. L. Hysell G. Michhue M. F. Larsen R. Pfaff M. Nicolls C. Heinselman H. Bahcivan |
spellingShingle |
D. L. Hysell G. Michhue M. F. Larsen R. Pfaff M. Nicolls C. Heinselman H. Bahcivan Imaging radar observations of Farley Buneman waves during the JOULE II experiment Annales Geophysicae |
author_facet |
D. L. Hysell G. Michhue M. F. Larsen R. Pfaff M. Nicolls C. Heinselman H. Bahcivan |
author_sort |
D. L. Hysell |
title |
Imaging radar observations of Farley Buneman waves during the JOULE II experiment |
title_short |
Imaging radar observations of Farley Buneman waves during the JOULE II experiment |
title_full |
Imaging radar observations of Farley Buneman waves during the JOULE II experiment |
title_fullStr |
Imaging radar observations of Farley Buneman waves during the JOULE II experiment |
title_full_unstemmed |
Imaging radar observations of Farley Buneman waves during the JOULE II experiment |
title_sort |
imaging radar observations of farley buneman waves during the joule ii experiment |
publisher |
Copernicus Publications |
series |
Annales Geophysicae |
issn |
0992-7689 1432-0576 |
publishDate |
2008-07-01 |
description |
Vector electric fields and associated <I><B>E</B></I>×<I><B>B</B></I> drifts
measured by a sounding rocket in the auroral zone during the NASA
JOULE II experiment in January 2007, are compared with coherent
scatter spectra measured by a 30 MHz radar imager in a common
volume. Radar imaging permits precise collocation of the spectra with
the background electric field. The Doppler shifts and spectral widths
appear to be governed by the cosine and sine of the convection flow
angle, respectively, and also proportional to the presumptive ion
acoustic speed. The neutral wind also contributes to the Doppler
shifts. These findings are consistent with those from the JOULE I
experiment and also with recent numerical simulations of Farley
Buneman waves and instabilities carried out by
Oppenheim et al. (2008). Simple linear analysis of the waves
offers some insights into the spectral moments. A formula relating the
spectral width to the flow angle, ion acoustic speed, and other
ionospheric parameters is derived. |
url |
https://www.ann-geophys.net/26/1837/2008/angeo-26-1837-2008.pdf |
work_keys_str_mv |
AT dlhysell imagingradarobservationsoffarleybunemanwavesduringthejouleiiexperiment AT gmichhue imagingradarobservationsoffarleybunemanwavesduringthejouleiiexperiment AT mflarsen imagingradarobservationsoffarleybunemanwavesduringthejouleiiexperiment AT rpfaff imagingradarobservationsoffarleybunemanwavesduringthejouleiiexperiment AT mnicolls imagingradarobservationsoffarleybunemanwavesduringthejouleiiexperiment AT cheinselman imagingradarobservationsoffarleybunemanwavesduringthejouleiiexperiment AT hbahcivan imagingradarobservationsoffarleybunemanwavesduringthejouleiiexperiment |
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