Medium-frequency skywave propagation at high latitudes: results of a five-year study

Hunsucker, R. D.; Delana, B. S.; Wang, J.C.H.

doi:10.1109/11.30838

Cited by 7 publications

(3 citation statements)

References 5 publications

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“…Signal levels increase by about 40 dB at nighttime, with auroral absorption greater after midnight than before midnight, in qualitative agreement with previous observations (e.g. Hunsucker et al, 1989;Greenberg and LaBelle, 2002) and models (e.g. Foppianno and Bradley, 1983).…”

Section: Terminator Effects On Radio-wave Propagationsupporting

confidence: 91%

“…These recovery times are typical of those reported for many previous PCA's (e.g. May 1986 storm analyzed by Hunsucker et al, 1989).…”

Section: Magnetic Storm and Substorm Effectssupporting

confidence: 78%

“…Hunsucker and Bates (1969) reviews the copious early literature on this LF/MF/HF propagation phenomenon. More recent examples include: observations on MF by Hunsucker et al (1989) showing ionospheric paths Kotzebue-Fairbanks and San Francisco-Fairbanks that were wiped out for 3 and 8-9 days, respectively, during a May 1986 magnetic storm; and storm-associated decreases in received HF signals quantitatively analyzed by Milan et al (1998). In addition to these well-documented decreases in LF/MF/HF ionospheric propagation during storms, superposed-epoch analysis of IGYera observations provides evidence of an increase in amplitude of received ionospheric propagating HF signals at 20-25 MHz during approximately 12 h prior to magnetic storm sudden commencements (Ondoh et al, 1964;Ondoh and Obu, 1965).…”

Section: Magnetic Storm and Substorm Effectsmentioning

confidence: 99%

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High-latitude propagation studies using a meridional chain of LF/MF/HF receivers

LaBelle

2004

Ann. Geophys.

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Abstract. For over a decade, Dartmouth College has operated programmable radio receivers at multiple high-latitude sites covering the frequency range 100-5000 kHz with about a 1-s resolution. Besides detecting radio emissions of auroral origin, these receivers record characteristics of the ionospheric propagation of natural and man-made signals, documenting well-known effects, such as the diurnal variation in the propagation characteristics of short and long waves, and also revealing more subtle effects. For example, at auroral zone sites in equinoctial conditions, the amplitudes of distant transmissions on MF/HF frequencies are often enhanced by a few dB just before they fade away at dawn. The polarization and/or direction of the arrival of ionospherically propagating signals in the lower HF range (3-5 MHz) show a consistent variation between pre-midnight, post-midnight, and pre-dawn conditions. As is well known, magnetic storms and substorms dramatically affect ionospheric propagation; data from multiple stations spanning the invariant latitude range 67-79 • reveal spatial patterns of propagation characteristics associated with magnetic storms and substorms. For example, in the hours preceding many isolated substorms, favorable propagation conditions occur at progressively lower latitudes as a function of time preceding the substorm onset. For some of these effects, explanations follow readily from elementary ionospheric physics, but understanding others requires further investigation.

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Section: Terminator Effects On Radio-wave Propagationsupporting

confidence: 91%

“…These recovery times are typical of those reported for many previous PCA's (e.g. May 1986 storm analyzed by Hunsucker et al, 1989).…”

Section: Magnetic Storm and Substorm Effectssupporting

confidence: 78%

Section: Magnetic Storm and Substorm Effectsmentioning

confidence: 99%

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High-latitude propagation studies using a meridional chain of LF/MF/HF receivers

LaBelle

2004

Ann. Geophys.

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Radio Propagation at LF , MF , and HF

Wang

2003

Wiley Encyclopedia of Telecommunications

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In this article, different modes of propagation are presented first. Factors affecting ground‐wave propagation are discussed. Propagation models and available software are presented and compared. The solar–terrestrial system, which forms the sky‐wave propagation environment, is described. Factors affecting sky‐wave propagation are discussed in detail. Different propagation models are discussed qualitatively and compared quantitatively. Definitions of the most important terms relating to propagation are given in Section 6.

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Propagation of Broadcast Transmissions

Wang

1999

Wiley Encyclopedia of Electrical and Electronics Engineering

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The sections in this article are Ground‐Wave Propagation The Sky‐Wave Propagation Environment Sky‐Wave Propagation at LF and MF Sky‐Wave Propagation at High Frequency Space‐Wave Propagation at VHF and UHF Acknowledgments and Closing Remarks Glossary

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Medium-frequency skywave propagation at high latitudes: results of a five-year study

Cited by 7 publications

References 5 publications

High-latitude propagation studies using a meridional chain of LF/MF/HF receivers

High-latitude propagation studies using a meridional chain of LF/MF/HF receivers

Radio Propagation at LF , MF , and HF

Propagation of Broadcast Transmissions

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