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| Titel |
The small amplitude of density turbulence in the inner solar wind |
| VerfasserIn |
S. R. Spangler |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1023-5809
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| Digitales Dokument |
URL |
| Erschienen |
In: Nonlinear Processes in Geophysics ; 10, no. 1/2 ; Nr. 10, no. 1/2, S.113-120 |
| Datensatznummer |
250007826
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| Publikation (Nr.) |
 copernicus.org/npg-10-113-2003.pdf |
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| Zusammenfassung |
| Very Long Baseline
Interferometer (VLBI) observations were made of radio sources close to the
Sun, whose lines of sight pass through the inner solar wind (impact
parameters 16-26 RE). Power spectra were analyzed of the
interferometer phase fluctuations due to the solar wind plasma. These
power spectra provide information on the level of plasma density
fluctuations on spatial scales of roughly one hundred to several thousand
kilometers. By specifying an outer scale to the turbulence spectrum, we
can estimate the root-mean-square (rms) amplitude of the density
fluctuations. The data indicate that the rms fluctuation in density is
only about 10% of the mean density. This value is low, and consistent with
extrapolated estimates from more distant parts of the solar wind. Physical
speculations based on this result are presented. |
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