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Observation of the Solar-Wind Turbulence Near the Sun


Callahan, Philip Sidney (1974) Observation of the Solar-Wind Turbulence Near the Sun. Dissertation (Ph.D.), California Institute of Technology. doi:10.7907/9ZFM-K287.


NOTE: Text or symbols not renderable in plain ASCII are indicated by [...]. Abstract is included in .pdf document. The solar-wind turbulence near the sun is investigated with data obtained near the superior conjunctions of Mariners 6, 7, and 9. The data are time histories of the change in the electron columnar content between the earth and spacecraft. The data were obtained with a group-phase technique which is sensitive only to the change in the columnar content. The measurement technique is discussed. The theory of power spectra is outlined. The relationship between the temporal power spectrum of the columnar content data and the comoving wave-number spectrum of the solar wind is derived. It is found that comoving spectrum is well represented by a power-law [...] of index [...]= 3.9 [...] 0.2. Comparison of the overall average spectral amplitude near the sun [...] to that near 1 a.u. shows that the turbulence declines with heliocentric distance as [...], ignoring time variations. In the region near the sun (0.07 [...] r [...] 0.22 a.u.) [...] declines more slowly. It is suggested that there is a region of enhanced turbulence near the sun. The Mariner 9 spectral amplitudes correlate with Zurich sunspot number. The data are used to investigate the relationship between McMath calcium plage regions and density enhancements intersecting the line of sight. The relationship of the present observations to theories of solar wind heating and to interplanetary scintillation observations is discussed.

Item Type:Thesis (Dissertation (Ph.D.))
Subject Keywords:(Physics and Astronomy)
Degree Grantor:California Institute of Technology
Division:Physics, Mathematics and Astronomy
Major Option:Physics
Minor Option:Astronomy
Thesis Availability:Public (worldwide access)
Research Advisor(s):
  • Jokipii, J. Randolph
Group:Astronomy Department
Thesis Committee:
  • Unknown, Unknown
Defense Date:1 February 1974
Record Number:CaltechETD:etd-10282005-130203
Persistent URL:
Default Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:4281
Deposited By: Imported from ETD-db
Deposited On:01 Nov 2005
Last Modified:19 Jul 2024 17:56

Thesis Files

PDF (Callahan_ps_1974.pdf) - Final Version
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