Effects on transionospheric HF propagation observed by ISIS at middle and auroral latitudes

James, H. G.

doi:10.1016/j.asr.2005.03.114

Cited by 16 publications

(32 citation statements)

References 7 publications

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“…The most probable reason for the lack of observable Faraday fading north of the transmitter was a disparity between the received power of the O-and X-modes. As presented by James (2006a) and James et al (2006), in several instances the Xmode was at least 10 dB stronger than the O-mode. This amplitude disparity was clearly not due to absorption in the E-region because the X-mode is absorbed more than the Omode.…”

Section: Isis II Transionospheric Analysismentioning

confidence: 94%

“…The program uses the International Geomagnetic Reference Field (IGRF) model (Maus et al, 2005) for determining the magnetic field and takes a user supplied one-or two-dimensional electron density profile. Using a Newton iteration method (James, 2006a), the ray trace converges to intersect with the location of the satellite within 10 m in typically a few iterations. It should be pointed out that the 10-m convergence criterion, in practice, applies to a line perpendicular to the propagation path at the satellite and corresponds to an error along the ray path of at most 10 cm.…”

Section: -D Ray Tracing Programmentioning

confidence: 99%

“…The main scientific goals of ePOP are to study ion outflows from the polar region, radio wave propagation, and ionospheric tomography (Yau et al, 2006). The main instruments used for the radio wave propagation experiment will be ground-based transmitters, such as Super Dual Auroral Radar Network (SuperDARN) HF radars (Greenwald et al, 1995) and Canadian Advanced Digital Ionosondes (CADI) (MacDougall et al, 1995), and the Radio Receiver Instrument (RRI) (James, 2003(James, , 2006aJames et al, 2006;Wang et al, 2004) on the ePOP payload.…”

Section: Introductionmentioning

confidence: 99%

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Modelling and observation of transionospheric propagation results from ISIS II in preparation for ePOP

et al. 2007

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Abstract. The enhanced Polar Outflow Probe (ePOP) is scheduled to be launched as part of the Cascade Demonstrator Small-Sat and Ionospheric Polar Explorer (CASSIOPE) satellite in early 2008. A Radio Receiver Instrument (RRI) on ePOP will receive HF transmissions from various groundbased transmitters. In preparation for the ePOP mission, data from a similar transionospheric experiment performed by the International Satellites for Ionospheric Studies (ISIS) II satellite has been studied. Prominent features in the received 9.303-MHz signal were periodic Faraday fading of signal intensity at rates up to 13 Hz and a time of arrival delay between the O-and X-modes of up to 0.8 ms. Both features occurred when the satellite was above or south of the Ottawa transmitter. Ionospheric models for ray tracing were constructed using both International Reference Ionosphere (IRI) profiles and local peak electron density values from ISIS ionograms. Values for fade rate and differential mode delay were computed and compared to the values observed in the ISIS II data. The computed values showed very good agreement to the observed values of both received signal parameters when the topside sounding foF2 values were used to scale IRI profiles, but not when strictly modelled IRI profiles were used. It was determined that the primary modifier of the received signal parameters was the foF2 density and not the shape of the profile. This dependence was due to refraction, at the 9.303-MHz signal frequency, causing the rays to travel larger distances near the peak density where essentially all the mode splitting occurred. This study should assist in interpretation of ePOP RRI data when they are available.

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Section: Isis II Transionospheric Analysismentioning

confidence: 94%

Section: -D Ray Tracing Programmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Modelling and observation of transionospheric propagation results from ISIS II in preparation for ePOP

et al. 2007

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“…For example, Wang et al (2003) studied the signature of ionospheric structures on the received power, signal delay, and direction of arrival. Thorough studies of data and modelling from a previous HF transionospheric experiment performed by the ISIS II satellite have also been performed by James (2006), James et al (2006), Gillies (2006), and Gillies et al (2007). In these studies, the experimentally measured Faraday rotation and differential signal delay of radio waves was compared to the same parameters as determined by computational models.…”

Section: Introductionmentioning

confidence: 99%

“…The scientific goals of ePOP are to study outflows of particles from the polar regions, radio wave propagation, and ionospheric tomography (Yau et al, 2006). Some radio experiments will use the Radio Receiver Instrument (RRI) on ePOP (James, 2003(James, , 2006James and Lunscher, 2006;. The RRI is a radio receiver that is fed by four 3-m dipole antennas.…”

Section: Introductionmentioning

confidence: 99%

Relative O- and X-mode transmitted power from SuperDARN as it relates to the RRI instrument on ePOP

et al. 2010

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Abstract. 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 Correspondence to: R. G. Gillies (rob.gillies@usask.ca) 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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First results of HF radio science with e‐POP RRI and SuperDARN

et al. 2017

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The first results from coordinated experiments between the Radio Receiver Instrument (RRI) on the Enhanced Polar Outflow Probe (e‐POP) and the Super Dual Auroral Radar Network (SuperDARN) Saskatoon high frequency (HF) radar are examined for a conjunction on 8 July 2014. e‐POP, a payload on the CAScade, Smallsat and IOnospheric Polar Explorer spacecraft, was located at 380 km altitude, approximately 10° north (geographic) and 2° west of Saskatoon, Canada, moving in a southeast direction. We use a matched filter technique to extract individual received SuperDARN pulses from the RRI data stream. The pulses show characteristics of propagation through the F region ionosphere: they are heavily dispersed, they show significant pulse‐to‐pulse variability in magnitude, and there is clear evidence that they experienced multipath propagation. We calculate the polarization parameters of the pulses and use them to identify magnetoionic phenomena such as mode‐splitting and single‐mode fading. These first RRI results provide compelling insight into HF radio wave propagation and show RRI's potential to significantly advance radio science.

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Effects on transionospheric HF propagation observed by ISIS at middle and auroral latitudes

Cited by 16 publications

References 7 publications

Modelling and observation of transionospheric propagation results from ISIS II in preparation for ePOP

Modelling and observation of transionospheric propagation results from ISIS II in preparation for ePOP

Relative O- and X-mode transmitted power from SuperDARN as it relates to the RRI instrument on ePOP

First results of HF radio science with e‐POP RRI and SuperDARN

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