DTIC ADA1026821: Radio Studies of Coronal Holes.

	DTIC ADA1026821: Radio Studies of Coronal Holes.
	by Defense Technical Information Center
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	This report describes all the projects undertaken during
	the entire period of the above contract, the scope of
	which was to study coronal holes at radio wavelengths.
	Chapters 1, 2 and 3 summarize work that has already been
	described in our previous scientific reports and
	published papers. Chapters 4 and 5 and comprehensive
	descriptions of the more recent work that has not been
	previously published. Chapter 1 describes the
	determination of the radio spectrum (relative changes in
	the brightness temperatures at different radio
	wavelengths) of Coronal Hole 1 in the Stanford 9.1 cm
	synoptic charts during the same period, when clear X-ray
	data of coronal holes were available from Skylab. Chapter
	2 summarizes our efforts to identify individual high
	latitude. Chapter 3 describes our 1977 coronal hole
	observations with the Haystack (1.94 and 3.81 cm) and
	Arecibo (11.5 and 21.4 cm) radio telescopes. Chapter 4
	describes the international effort we organized in the
	summer of 1978 to obtain solar radio maps over a wide
	range of wavelengths. These radio maps were made on the
	same days at a number of radio observatories around the
	world. Chapter 5 describes the use of the observed radio
	spectra to produce models of the solor atmosphere inside
	coronal holes. The results of this analysis indicate that
	inside coronal holes the following changes occur: The
	chromosphere expands in height by about a factor of 2,
	while the temperatures and electron and neutral particle
	densities decrease to about 80% of their quiet sun
	values. The critical transition zone expands by a factor
	of about 5-6, while the temperatures decrease to about
	50% and the electron densities to about 20% of their
	quiet sun values.

	Date Published: 2020-02-14 00:04:40
	Identifier: DTIC_ADA1026821
	Item Size: 58494813
	Language: english
	Media Type: texts

	# Topics
	DTIC Archive; Papagiannis,Michael D ;...

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