48. The radial brightness distribution of the sun at 9·4 cm.

The Naval Research Laboratory has supported four eclipse expeditions (in the years 1947, 1950, 1952 and 1954) under the direction of Dr J. P. Hagen. The principal purpose was to find the variation of the solar microwave radiation during a total optical eclipse of the sun. During the last two eclipses the sun was sufficiently inactive to enable us to derive the centre-to-limb brightness distribution at a wave-length of 9·4 cm., on the assumption that the distribution was circularly symmetrical. Since these two eclipses were of the same optical magnitude (within 0·12 %) and were measured with the same equipment located at each eclipse near the centre-line of mid-totality, it is of interest to compare their results. The 1954 eclipse observation was described in the last paper by Mayer, Sloanaker and Hagen. The 1952 observation has already been described [1].

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47. Observation of the solar eclipse of 30 June 1954 at 9·4 cm. wave-length

Symposium - International Astronomical Union ◽

10.1017/s0074180900049226 ◽

1957 ◽

Vol 4 ◽

pp. 269-272

Author(s):

C. H. Mayer ◽

R. M. Sloanaker ◽

J. P. Hagen

Keyword(s):

Solar Eclipse ◽

Research Laboratory ◽

Wave Length ◽

Total Solar Eclipse ◽

Naval Research Laboratory ◽

Naval Research ◽

Centre Line ◽

Set Up ◽

The City

The observation of the total solar eclipse of 30 June 1954 at 9·4 cm. wavelength was one of the experiments carried out by the Naval Research Laboratory eclipse expedition to Sweden. The apparatus was set up in the city of Oskarshamn at a point about 5 km. north of the centre-line of totality. At this location the eclipse was total, with magnitude 1·035, at 12h 48m u.t.

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Measurement of solar X-Ray spectrum between 13 and 26 Å

Symposium - International Astronomical Union ◽

10.1017/s0074180900179409 ◽

1965 ◽

Vol 23 ◽

pp. 53-55

Author(s):

R. L. Blake ◽

T. A. Chubb ◽

H. Friedman ◽

A. E. Unzicker

Keyword(s):

Solar Disk ◽

Research Laboratory ◽

Naval Research Laboratory ◽

Naval Research ◽

The Sun ◽

Crystal Spectrometer ◽

X Ray ◽

Plage Region ◽

To Come ◽

Pointing Control

In July 1963, the U. S. Naval Research Laboratory flew an Aerobee rocket equipped with a Bragg Crystal Spectrometer in an attempt to record an x-ray spectrum of solar emission. A pointing control was used to keep the device accurately pointed at the Sun. A spectrum of about 12 lines between 12 and 25 Å was recorded, made up mainly of lines from O VII, O VIII, N VII and Fe X VII. The O VII and N VII lines appeared to come from the entire solar disk. The Fe XVII lines originated almost entirely in a single plage region.

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