Abstract
FROM visual analyses of the dynamic (frequency–time) spectra and recordings of the integrated intensity of chorus, a very-low frequency electromagnetic radiation which occurs naturally in the Earth's magnetosphere, it has been ascertained1–3 that chorus exhibits periodic or quasi-periodic characteristics arising from (1) periodic spacing of individual or groups of emissions (rising tones) or (2) amplitude modulation of the emissions or (3) both. These investigations have, however, been more qualitative than quantitative.
This is a preview of subscription content, access via your institution
Access options
Subscribe to this journal
Receive 51 print issues and online access
$199.00 per year
only $3.90 per issue
Buy this article
- Purchase on Springer Link
- Instant access to full article PDF
Prices may be subject to local taxes which are calculated during checkout
Similar content being viewed by others
References
Helliwell, R. A., Whistlers and Related Ionospheric Phenomena (Stanford University Press, Stanford, 1965).
Brice, N. M., Discrete Very Low frequency emissions from the Upper Atmosphere. Report No. SEL 64–088 (Stanford University Press, Stanford 1964).
Oliven, M. N., and Gurnett, D. A., J. geophys. Res., 73, 2355 (1968).
Blackman, R. B., and Tukey, J. W., The Measurement of Power Spectra (Dover New York, 1958).
Jenkins, G. M., and Watts, D. G., Spectral Analysis and its applications (Holden-Day, London, 1968).
Coriniti, F. V., and Kennel, C. F., J. geophys. Res., 75, 1279 (1970).
Orr, D., and Matthew, J. A. D., Planet. Space Sci., 19, 897 (1971).
Kennel, C. F., and Petschek, H. E., J. geophys. Res., 71, 1 (1966).
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
ADJEPONG, S. Evolution of periodicities exhibited by fluctuations in the intensity of chorus. Nature 259, 645–648 (1976). https://doi.org/10.1038/259645a0
Received:
Accepted:
Issue Date:
DOI: https://doi.org/10.1038/259645a0
Comments
By submitting a comment you agree to abide by our Terms and Community Guidelines. If you find something abusive or that does not comply with our terms or guidelines please flag it as inappropriate.
