Solar activity and MF skywave propagation

Wang, J.C.H.

doi:10.1109/11.30836

Cited by 6 publications

(4 citation statements)

References 8 publications

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“…When other factors are nearly the same, the signal of a lower-frequency (e.g., 700 kHz) station varies more widely than that of a higher frequency (e.g., 1530 kHz). The difference is typically 5 or 6 dB [Wang, 1989b]. At 6 hours after sunset this phenomenon is virtually diminished.…”

Section: Effect Of Solar Activitymentioning

confidence: 98%

“…This effect is more pronounced in some parts of the world (e.g., the United States and Canada) than in other parts. The reduction of field strength due to solar activity, Lr, is a function of sunspot number, latitude, distance, and frequency [Wang, 1989b].…”

Section: Effect Of Solar Activitymentioning

confidence: 99%

“…and that for the second hour after sunset decreased by 16.9 dB. For a more detailed discussion on this topic, see a paper by Wang [1989b]. Magnetic storms also have a strong impact on MF propagation at high latitudes.…”

Section: Effect Of Solar Activitymentioning

confidence: 99%

“…According to the Wang method the annual median sky-wave field strength at 6 hours after sunset, E (in decibels above 1 Knight, 1975]; Lr loss of field strength due to solar activity in decibels [see Wang, 1989b].…”

Section: Annual Median Field Strengthmentioning

confidence: 99%

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An objective evaluation of available LF/MF sky‐wave propagation models

Wang¹

1999

Radio Science

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Abstract. This paper presents results of an extensive comparative study in which all four major field-strength prediction methods are compared with measured data. The most recent data bank has been used. These methods are analyzed in detail. Factors affecting sky-wave propagation are discussed. Some historical background is also presented. IntroductionThe purpose of this paper is to evaluate the currently used LF/MF sky-wave propagation models. A brief historical background, including some major worldwide field-strength measurement campaigns, is presented in section 2. The most up-to-date and largest data bank has been organized and studied and used in this study. Factors affecting sky-wave propagation and some observed phenomena are discussed in section 3. Currently used methods for predicting field strengths are qualitatively discussed in section 4 and quantitatively compared in section 5. Historical Background: Six Decades of Concerted EffortsIn this section a brief historical background behind the currently used field-strength prediction models is given. This is important for two reasons: to document some valuable historical facts and, more importantly, to help the users to select the right propagation models for their particular applications. The two curves were formally adopted at the 1938 Early International Efforts and the Cairo

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Section: Effect Of Solar Activitymentioning

confidence: 98%

Section: Effect Of Solar Activitymentioning

confidence: 99%

Section: Effect Of Solar Activitymentioning

confidence: 99%

Section: Annual Median Field Strengthmentioning

confidence: 99%

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An objective evaluation of available LF/MF sky‐wave propagation models

Wang¹

1999

Radio Science

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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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Solar activity and MF skywave propagation

Cited by 6 publications

References 8 publications

An objective evaluation of available LF/MF sky‐wave propagation models

An objective evaluation of available LF/MF sky‐wave propagation models

Radio Propagation at LF , MF , and HF

Propagation of Broadcast Transmissions

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