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

Perry, G. W.; James, H. G.; Gillies, R. G.; Howarth, Andrew; Hussey, G. C.; McWilliams, K. A.; White, A.; Yau, A. W.

doi:10.1002/2016rs006142

Cited by 15 publications

(25 citation statements)

References 24 publications

(45 reference statements)

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“…Also at 22:29:30 UT a particularly strong transmission with repetitive side lobes of ∼5 kHz around 10.436 MHz was observed for ∼3 s across most of the band. Detailed analysis of this time period indicated that this period is consistent with the pulse pattern of a Super Dual Auroral Radar Network radar such as those discussed by Perry et al ().…”

Section: Resultssupporting

confidence: 83%

Polarization Characteristics Inferred From the Radio Receiver Instrument on the Enhanced Polar Outflow Probe

et al. 2018

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The Radio Receiver Instrument (RRI) on the CAScade, Smallsat, and Ionospheric Polar Explorer/enhanced Polar Outflow Probe (CASSIOPE/e‐POP) satellite was used to receive continuous wave and binary phase shift keyed transmissions from a high‐frequency transmitter located in Ottawa, ON, Canada during April 2016 to investigate how the ionosphere affects the polarization characteristics of transionospheric high‐frequency radio waves. The spacecraft orientation was continuously slewed to maintain the dipole orientation in a plane perpendicular to the direction toward the transmitter, enabling the first in situ planar polarization determination for continuous wave and binary phase shift keyed modulated radio waves from space at times when the wave frequency is at least 1.58 times the plasma frequency. The Stokes parameters and polarization characteristics were derived from the measured data and interpreted using an existing ray tracing model. For the southern part of the passes, the power was observed to oscillate between the two dipoles of RRI, which was attributed to Faraday rotation of the radio waves. For the first time, a reversal in the rate of change of orientation angle was observed where the minimum in modeled Faraday rotation occurred. The reversal point was poleward of the point of closest approach between the satellite and transmitter; this was explained by the variations of total electron content and component of magnetic field along the direction of propagation. The received signals show both quasi‐longitudinal (QL) and quasi‐transverse characteristics. South of the transmitter the QL regime is dominant. Around the reversal point, a combination of QL and quasi‐transverse nature was observed.

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Section: Resultssupporting

confidence: 83%

Polarization Characteristics Inferred From the Radio Receiver Instrument on the Enhanced Polar Outflow Probe

et al. 2018

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“…A diagram of the CAScade, Smallsat and Ionospheric Polar Explorer spacecraft showing enhanced Polar Outflow Probe's eight instruments, reproduced from Perry et al (). Shown are the Radio Receiver Instrument (RRI); the Global Position System Attitude, Positioning, and Profiling experiment (GAP); the Imaging and Rapid‐scanning ion Mass spectrometer (IRM); the Fast Auroral Imager (FAI); the MaGnetic Field instrument (MGF); the Neutral Mass Spectrometer (NMS); the Coherent Electromagnetic Radiation tomography experiment (CER); and the Suprathermal Electron Imager (SEI).…”

Section: The 2015 Enhanced Polar Outflow Probe Rri Field Day Experimentsmentioning

confidence: 99%

“…For example, RRI Input A may be tuned to 4 MHz while RRI Input B is tuned to 40 kHz. This flexibility allows RRI to study a wide variety of HF radio emissions, including those produced artificially by ionospheric heaters (James et al, , ) and over‐the‐horizon radar systems (Burrell et al, , ; Perry et al, ).…”

Section: The 2015 Enhanced Polar Outflow Probe Rri Field Day Experimentsmentioning

confidence: 99%

Citizen Radio Science: An Analysis of Amateur Radio Transmissions With e‐POP RRI

et al. 2018

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We report the results of a radio science experiment involving citizen scientists conducted on 28 June 2015, in which the Radio Receiver Instrument (RRI) on the Enhanced Polar Outflow Probe (e‐POP) tuned in to the 40‐ and 80‐m ham radio bands during the 2015 American Radio Relay League Field Day. We have aurally decoded the Morse coded call signs of 14 hams (amateur operators) from RRI's data to help ascertain their locations during the experiment. Through careful analysis of the hams' transmissions, and with the aid of ray tracing tools, we have identified two notable magnetoionic effects in the received signals: plasma cutoff and single‐mode fading. The signature of the former effect appeared approximately 30 s into the experiment, with the sudden cessation of signals received by RRI despite measurements from a network of ground‐based receivers showing that the hams' transmissions were unabated throughout the experiment. The latter effect, single‐mode fading, was detected as a double‐peak modulation on the individual dots and dashes of one of the ham's Morse coded transmissions. We show that the modulation in the ham's signal agrees with expected fading rate for single‐mode fading. The results of this experiment demonstrate that ham radio transmissions are a valuable tool for studying radio wave propagation and remotely sensing the ionosphere. The analysis and results provide a basis for future collaborations in radio science between traditional researchers in the academia and industry, and citizen scientists in which novel and compelling experiments can be performed.

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“…Since launch, e‐POP RRI has been used in international collaborations to detect artificially generated radio transmissions[ James et al , ; Burrell et al , ; Frissell et al , ]. However, Perry et al [] performed the first in‐depth e‐POP RRI study, presenting conjunctions with the HF Super Dual Auroral Radar Network (SuperDARN) [ Chisham et al , ]. Their study used observations of individual pulses to show evidence of mode splitting, multipath propagation, and fading.…”

Section: First Resultsmentioning

confidence: 99%

“…As predicted by James et al [], Perry et al [] also observed fluctuations in the power signatures, or fades, in received pulses. There are a variety of explanations for these fades, including Faraday rotation (which causes the signal to rotate and the receiver to pick up different phases of the signal) and single‐mode fades (which are caused by the destructive interference of wave fronts affected by multipath for either the O ‐mode or the X ‐mode).…”

Section: First Resultsmentioning

confidence: 99%

e‐POP RRI provides new opportunities for space‐based, high‐frequency radio science experiments

Burrell

2017

Radio Science

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Perry et al. (2016, https://doi.org/10.1002/2017JG003855) present the first results of the Radio Receiver Instrument (RRI), a part of the enhanced Polar Outflow Probe (e‐POP) that flies on board the CAScade, Smallsat and IOnospheric Polar Explorer satellite. Using a matched filter technique, e‐POP RRI was able to observe individual radio pulses transmitted by a ground‐based radar. These results were used to examine the temporal variations in the dispersion, polarization, and power of the pulses, demonstrating the capacity for e‐POP RRI to contribute to studies of radio propagation at high‐frequency (HF) ranges. Understanding radio propagation in the presence and absence of ionospheric irregularities is crucial for ionospheric physics, as well as commercial and military radio applications. Conjunctions between e‐POP RRI and ground‐ or space‐based HF transmitters offer a new opportunity for coherent scatter experiments.

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

Cited by 15 publications

References 24 publications

Polarization Characteristics Inferred From the Radio Receiver Instrument on the Enhanced Polar Outflow Probe

Polarization Characteristics Inferred From the Radio Receiver Instrument on the Enhanced Polar Outflow Probe

Citizen Radio Science: An Analysis of Amateur Radio Transmissions With e‐POP RRI

e‐POP RRI provides new opportunities for space‐based, high‐frequency radio science experiments

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