Propagation of Audio-Frequency Radio Waves to Great Distances

Chapman, F. W.; Macario, R.C.V.

doi:10.1038/177930a0

Cited by 90 publications

(24 citation statements)

References 6 publications

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“…, Aug. 17-20, 1964. This model pe rmits a close re produ c tion of th e nois e spectra meas ure me nts in th e reso nan ce region, and it also provides an agree me nt with measured ELF attenuation rates [Chapman and Macario, 1956; J ean e t a1., 1961).…”

Section: Introductionmentioning

confidence: 99%

Schumann resonances

Galejs¹

1965

J. RES. NATL. BUR. STAN. SECT. D. RAD. SCI.

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This paper re vi e ws the c urre nt work in the fi eld of Sc humann resonances and di sc usses the topi cs of waveforms and frequ e ncy es tim a tes , reso nance fre quen cies and Q fa ctors, sourc e dI strIbutIOn s and nois e spectra. diurnal and seaso nal c hanges of power spectra, and .variati ons of resonance frequ e ncIes . Obse rvation s of th e a bove ph e nome na a re co rre lat ed WIth th eore tI ca l co ns Id e ratIon s.

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Section: Introductionmentioning

confidence: 99%

Schumann resonances

Galejs¹

1965

J. RES. NATL. BUR. STAN. SECT. D. RAD. SCI.

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“…We have been concerned with the extension of the experimental values of the attenuation constant of long radio waves obtained by Chapman and Macario [1956] in the frequency range 100 cis to 10 kcls to lower frequencies . It was not possible to employ the method of Chapman and Macario at lower frequencies due to certain theoretical objections [Wait, 1960a].…”

Section: Introductionmentioning

confidence: 99%

Observations of earth-ionosphere cavity resonances and their interpretation in terms of a two-layer ionosphere model

Chapman¹,

Jones²

1964

J. RES. NATL. BUR. STAN. SECT. D. RAD. SCI.

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A(j) 1(t)PThe frequ encies of t he resonance modes of t he earth-ionosphere cavity have been dete rmined by means of a direct recording integrating sp ectrom eter over a p eriod of one year a nd diurn al and seasona l changes ha ve been observed. The exp erimenta l data on the frequencies of t he first few reso na n t modes a re interpreted in terms of a mo del ionosp here consisting of two d iscr ete homoge neo us r egions. A model which accounts for t he observations is d eri ved a nd t he propagation constant of extremely low fr equ ency electromagnetic waves, appropriate to wo rldwide propagation has been d eterm ined for t he deri ved model. The r es ults are comp a red wi t h t hose obtained by other wo rke rs us ing a differen t a pp roac h. List of SymbolsSource term l (t ) l1)

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“…Only the waveform signatures of large amplitude lightning discharges are apt to be received above background noise at a large distance from the source, and the current moment of Galejs (1967) is not of sufficient amplitude to explain the waveforms presented here (private communication, Janis Galejs). The current moment of Galejs had to be increased approximately 40 dB over the frequency range from 100c/s to 1kc/s to reasonably predict the measured field strengths using the attenuation rates of Chapman and Macario (1956). At a frequency of 10c/s the calculated current moment of Galejs is approximately 20dB lower than the mean current moment determined by Rycroft (1965) from electric field measurements of the earth-ionosphere cavity resonances.…”

Section: Discussionmentioning

confidence: 95%

Current Moments at ELF of Lightning Discharges Associated with a Mature Tropical Hurricane

Hughes

1967

J. geomagn. geoelec

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The mean spectrum of negative polarity slow tail ELF atmospherics received during daytime from the area of a distant mature tropical storm (Hurricane Blanca, August 1966) is presented. The mean amplitude spectrum is used with established attenuation rates to calculate from zero-order mode theory the mean current moment associated with the waveform sources. It is suggested that the waveforms may be greatly controlled by intracloud lightning discharges associated with the degree of vertical development of the hurricane.

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Propagation of Audio-Frequency Radio Waves to Great Distances

Cited by 90 publications

References 6 publications

Schumann resonances

Schumann resonances

Observations of earth-ionosphere cavity resonances and their interpretation in terms of a two-layer ionosphere model

Current Moments at ELF of Lightning Discharges Associated with a Mature Tropical Hurricane

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