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The spectrum of small-scale density fluctuations in the solar wind

Readhead, A. C. S. and Kemp, M. C. and Hewish, A. (1978) The spectrum of small-scale density fluctuations in the solar wind. Monthly Notices of the Royal Astronomical Society, 185 (2). pp. 207-226. ISSN 0035-8711. https://resolver.caltech.edu/CaltechAUTHORS:20200601-143023790

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Abstract

Interplanetary scintillation observations at frequencies between 74 and 1400 MHz and solar elongations in the range 10–90° are combined to determine the form of the wavenumber spectrum of electron density fluctuations in the range 10⁻³ < k < 10⁻¹/km (where k = 2π/λ). The data are best explained by a spectrum in which there is a genuine scale-length; they are not consistent with a simple power-law spectrum. This suggests that turbulence may be less important than some kind of plasma instability in generating small-scale density fluctuations. The relevance of these conclusions to the use of IPS for determining radio source structure is discussed.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1093/mnras/185.2.207DOIArticle
https://ui.adsabs.harvard.edu/abs/1978MNRAS.185..207R/abstractADSArticle
ORCID:
AuthorORCID
Readhead, A. C. S.0000-0001-9152-961X
Additional Information:© 1978 Royal Astronomical Society. Provided by the NASA Astrophysics Data System. Received 1978 March 20; in original form 1977 November 9. We thank G. Bourgois, A. G. F. Brown and L. T. Little for providing data prior to publication, and the referee for helpful comments. ACSR is indebted to the Royal Society for a fellowship supported by the Weir Foundation, MCK gratefully acknowledges the support of an SRC studentship.
Funders:
Funding AgencyGrant Number
Royal SocietyUNSPECIFIED
Weir FoundationUNSPECIFIED
Science Research Council (SRC)UNSPECIFIED
Issue or Number:2
Record Number:CaltechAUTHORS:20200601-143023790
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20200601-143023790
Official Citation:A. C. S. Readhead, M. C. Kemp, A. Hewish, The spectrum of small-scale density fluctuations in the solar wind, Monthly Notices of the Royal Astronomical Society, Volume 185, Issue 2, November 1978, Pages 207–226, https://doi.org/10.1093/mnras/185.2.207
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:103607
Collection:CaltechAUTHORS
Deposited By: George Porter
Deposited On:02 Jun 2020 14:01
Last Modified:02 Jun 2020 14:01

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