Consolidated Amateur Radio Signal Reports as Indicators of Intense Sporadic E Layers

Deacon, Chris; Mitchell, Cathryn N.; Watson, Robert J.

doi:10.20944/preprints202204.0267.v1

Cited by 3 publications

(1 citation statement)

References 17 publications

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“…Recently, Yamazaki et al (2022) presented convincing evidence linking sporadic-E to zonal wind shears using ICON/MIGHTI interferometer wind profile data and COSMIC-2/RO retrieved electron density profiles. Deacon et al (2022) have linked sporadic-E to long-distance amateur radio propagation reports on frequencies up to 70 MHz, while amateur groups themselves routinely map sporadic-E (e.g. Sampol, retrieved 2022).…”

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Long Distance Propagation of 162-MHz Shipping Information Links Associated with Sporadic-E

Chartier

Hanley²,

Emmons³

2022

Preprint

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Abstract. Anomalous long distance reports of Automatic Identification System (AIS) shipping transmissions were received by a United States Coast Guard terrestrial monitoring network in the eastern United States and Puerto Rico. 6677 signals were identified from ships located over 1000-km from the ground stations between 13 and 14 July 2021, with almost no long-distance links received at night or at any time on 15 July. The cause appears to be sporadic-E layers identified by Digisonde and satellite radio occultation data. The density of these layers cannot be accurately determined, but might exceed 27 MHz, or 9x1012 el. m3. AIS transmissions potentially provide an excellent means of identifying dense sporadic-E layers globally.

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confidence: 99%

Long Distance Propagation of 162-MHz Shipping Information Links Associated with Sporadic-E

Chartier

Hanley²,

Emmons³

2022

Preprint

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Consolidated Amateur Radio Signal Reports as Indicators of Intense Sporadic E Layers

2022

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A case study is presented which demonstrates the value and validity of a novel approach to the use of consolidated amateur (‘ham’) radio reception reports as indicators of the presence of intense ionospheric sporadic E (Es). It is shown that the use of amateur data can provide an important supplement to other techniques, allowing the detection and tracking of Es where no suitable ionosonde or other measurements are available. The effectiveness of the approach is demonstrated by reference to ionosonde data, and the advantages and limitations of the technique are discussed.

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Evidence for the Magnetoionic Nature of Oblique VHF Reflections from Midlatitude Sporadic-E Layers

et al. 2022

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Mid-latitude sporadic-E (Es) is an intermittent phenomenon of the lower E region of the ionosphere. Es clouds are thin, transient, and patchy layers of intense ionization, with ionization densities which can be much higher than in the background ionosphere. Oblique reflection of radio signals in the very high frequency (VHF) range is regularly supported, but the mechanism for it has never been clearly established—specular reflection, scattering, and magnetoionic double refraction have all been suggested. This article proposes using the polarization behaviour of signals reflected from intense midlatitude sporadic-E clouds as an indicator of the true reflection mechanism. Results are presented from a measurement campaign in the summer of 2018, which gathered a large amount of data at a receiving station in the UK using 50 MHz amateur radio beacons as signal sources. In all cases the signals received were elliptically polarized, despite being transmitted with linear polarization; there were also indications that polarization behaviour varied systematically with the orientation of the path to the geomagnetic field. This represents, for all the examples recorded, clear evidence that signals were reflected from midlatitude Es by magnetoionic double refraction.

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Consolidated Amateur Radio Signal Reports as Indicators of Intense Sporadic E Layers

Cited by 3 publications

References 17 publications

Long Distance Propagation of 162-MHz Shipping Information Links Associated with Sporadic-E

Long Distance Propagation of 162-MHz Shipping Information Links Associated with Sporadic-E

Consolidated Amateur Radio Signal Reports as Indicators of Intense Sporadic E Layers

Evidence for the Magnetoionic Nature of Oblique VHF Reflections from Midlatitude Sporadic-E Layers

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