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| Titel |
Relative O- and X-mode transmitted power from SuperDARN as it relates to the RRI instrument on ePOP |
| VerfasserIn |
R. G. Gillies, G. C. Hussey, G. J. Sofko, H. G. James |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 28, no. 3 ; Nr. 28, no. 3 (2010-03-24), S.861-871 |
| Datensatznummer |
250016809
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| Publikation (Nr.) |
 copernicus.org/angeo-28-861-2010.pdf |
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| Zusammenfassung |
| The Cascade Demonstrator Small-Sat and Ionospheric Polar Explorer (CASSIOPE)
satellite is scheduled to be launched in 2010. On board this satellite will
be a suite of eight scientific instruments comprising the enhanced Polar
Outflow Probe (ePOP). One instrument is the Radio Receiver Instrument (RRI)
which will be used to receive HF transmissions from various ground
transmitters such as the Super Dual Auroral Radar Network (SuperDARN) array.
Magnetoionic polarization and propagation theory have been used to model the
relative power that SuperDARN delivers to the Ordinary (O) and Extraordinary
(X) modes of propagation. These calculations have been performed for various
frequencies in the SuperDARN transmitting band and for all five Canadian
based SuperDARN radars. The geometry of the radars with respect to the
background magnetic field results in the X-mode dominating the transmitted
signal when the modelled wave propagates northward and is nearly
perpendicular to the magnetic field lines. Other propagation directions
(i.e., above or southwards of the radar) results in propagation which is
anti-parallel to the magnetic field lines and an equal splitting of
transmitted power between the O- and X-modes occurs. The modelling analysis
shows that for either high transmitting frequencies or low ionospheric
electron densities, the range of latitudes that signal will be received is
quite large (up to ~90° of latitude). Also for these conditions,
the range of elevations where the X-mode signal strongly dominates the O-mode
signal will be apparent in the received signal. Conversely, for lower
transmitting frequencies or higher ionospheric electron densities, the
latitudinal range that signal will be received over is smaller. Here the
X-mode-only band is not apparent in the received signal as both modes will be
received with roughly equal power. These relative mode power calculations can
be used to characterize the average electron density content in the
ionosphere or provide a measure of relative absorption in the D- and
E-regions when the satellite passes through the field-of-view of a SuperDARN
radar. |
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