scholarly journals VIII. Total eclipse of the sun, May 28, 1900. Account of the observations made by the solar physics observatory eclipse expedition and the officers and men of H. M. S. “Theseus” at Santa Pola, Spain

1902 ◽  
Vol 198 (300-311) ◽  
pp. 375-415
Keyword(s):  
Solar Physics ◽  
The Sun ◽  
Total Eclipse

The discussion of the series of photographs taken with the prismatic cameras employed in the last three eclipses indicated that continued work with this form of spectroscope should be undertaken, with the view (1) of obtaining data strictly comparable with the previous photographs, and (2) of extending the inquiry into the comparative lengths of the various arcs. For the first purpose it seemed desirable to repeat the Indian work with the 6-inch camera having two prisms; while for the second an instrument of longer focus was necessary.

scholarly journals The total eclipse of the sun, April 16, 1893. Report and discussion of the observations relating to solar physics

1897 ◽  
Vol 60 (359-367) ◽  
pp. 17-19
Keyword(s):  
West Africa ◽  
Solar Physics ◽  
The Sun ◽  
Total Eclipse

The memoir first gives reports by Mr. Fowler and Mr. Shackleton as to the circumstances under which photographs of the spectra of the eclipsed sun were taken with prismatic cameras in West Africa and Brazil respectively on April 16, 1893.

scholarly journals Total eclipse of the Sun, May 28, 1900.—Account of the observations made by the Solar Physics Observatory Eclipse expedition and the officers and men of H. M. S. 'Theseus' at Santa Pola, Spain

1901 ◽  
Vol 68 (442-450) ◽  
pp. 404-405
Keyword(s):  
Preliminary Report ◽  
Solar Physics ◽  
The Sun ◽  
Total Eclipse

The Report gives details as to the erection of coronagraphs, prismatic cameras, and other instruments, and of the results obtained by their use during the eclipse, which was observed under very favourable circumstances. Some of the more obvious results have already been stated in a Preliminary Report, and the following remarks may now be added. A comparison of the photographs taken with the coronagraph of 16 feet focus with those taken about two hours earlier in America indicates that while some of the prominences changed greatly in appearance in the interval, no changes were detected in the details of the corona.

scholarly journals III. Total eclipse of the sun observed at Caroline Island, on 6th May, 1883

1889 ◽  
Vol 180 ◽  
pp. 119-135 ◽  
Keyword(s):  
Royal Society ◽  
Solar Physics ◽  
The Sun ◽  
The Moon ◽  
Solar Image ◽  
Total Eclipse ◽  
Previous Communication

Owing to the representations of the Committee on Solar Physics, who communicated with the Royal Society the desirability of observing this eclipse, an expedition was organised under the auspices of the latter body. The Council of the Royal Society having requested me to draw up a report on the Total Eclipse observed at Caroline Island, I undertook the task so far as relates to the results which were obtained with the same instruments which were employed in the observations of the Total Eclipse in Egypt in 1882. Two observers, Mr. H. Lawrance and Mr. C. R. Woods, who had both taken part in the Eclipse Expedition to Egypt as assistants to Professors Lockyer and Schuster, were entrusted with the arduous duty of making the observations. The expedition was devoted entirely to photographic work, the main object being to continue the photographic observations which had been carried on in Egypt, consisting of photographs of the corona taken on very rapid plates with varying exposure, photographs of the corona taken with a slitless spectroscope (the prismatic camera), and a photograph of the corona spectrum, the image of the moon and the corona being thrown on the slit cutting the diameter of the former. There is no occasion to describe the instruments which were employed for the first two classes of observations, as they have been fully described in the previous communication to the Royal Society by Professor Schuster and myself which appears in the ‘Philosophical Transactions’ for 1884. The photographic spectroscope which was employed on this occasion differed in one detail, and in one detail only, in that the dispersion was doubled, two medium dense flint prisms of 62½° being employed instead of one prism of the same angle. The experience gained in Egypt seemed to show that, if the coronal light was equally bright in the two eclipses, the rapid plates used on both occasions would be amply adequate to secure photographs with the larger dispersion. Besides these observations several others were made, but did not meet with the success it was hoped they would have done. A photoheliograph, giving a 4-inch solar image, was attached to an equatorial mount, in addition to the wooden camera carrying a lens of 5 ft. 6 in. focus, with which the smaller-sized pictures of the corona were taken in Egypt. The pictures taken with the former though sufficiently exposed, showed that a large image could be utilised.

scholarly journals II. Preliminary report on the results obtained with the prismatic camera during the total eclipse of the Sun, April 16, 1893

1894 ◽  
Vol 56 (336-339) ◽  
pp. 7-8
Keyword(s):  
Preliminary Report ◽  
Solar Physics ◽  
The Sun ◽  
Total Eclipse

Daring the total eclipse of 1871 observations were made by Respighi and the author with a spectroscope deprived of its collimator, and a series of rings was seen corresponding to the different rays emitted by the corona and prominences. A similar instrument, arranged for photography, was employed during several succeeding eclipses, but the photographs were on so small a scale that none of the results came up to the expectations raised by the observations of 1871. As the Solar Physics Committee is now in possession of a prismatic camera of 6 inches aperture, the prism having a refracting angle of 45°, it was determined to employ it during the eclipse of 1893. The instrument was placed at the disposal of the Eclipse Committee by the Solar Physics Committee, and was entrusted to Mr. Fowler, who took the photographs at the African station.

scholarly journals XV. The total eclipse of the sun, April 16th, 1893 —Report and discussion of the observations relating to solar physics

1896 ◽  
Vol 187 ◽  
pp. 551-618 ◽  
Keyword(s):  
Continuous Spectrum ◽  
Solar Physics ◽  
Extreme Value ◽  
The Sun ◽  
Total Eclipse

The results obtained by Professor Respighi and myself during the eclipse of 1871 in India, in which part of the attack consisted in the employment of slitless spectro­scopes—a method of work at which we had arrived independently—indicated the extreme value of such observations. For my own observations in 1871 I had arranged a train of five prisms without either collimator or observing telescope. “I saw four rings with projections defining the prominences. In brightness, C came first, then F, then G, and last of all 1474k. Further, the rings were nearly all the same thickness, certainly not more than 2' high, and they were all enveloped in a band of continuous spectrum.

scholarly journals Total eclipse of the Sun, May 28, 1900. Preliminary account of the observations made by the solar physics observatory eclipse expedition and the officers and men of H. M. S. 'Theseus,’ at Santa Pola

1901 ◽  
Vol 67 (435-441) ◽  
pp. 337-346
Keyword(s):  
Solar Physics ◽  
Central Line ◽  
The Sun ◽  
Total Eclipse ◽  
Eclipse Observations ◽  
Preliminary Account

The observing station selected for my party was determined upon from information supplied by the Hydrographer, Rear-Admiral Sir W. J. L. Wharton, R. N., K. C. B., F. R. S. Santa Pola appeared likely to meet the requirements of a man-of-war, and without such assistance as a man-of-war can render, the manipulation of long focus prismatic cameras in eclipse observations in a strange country is impracticable. Santa Pola lies very near the central line of the eclipse, and good anchorage was available, protected from some winds.

The Total Eclipse of the Sun, 1893

1892 ◽  
Vol 34 (883supp) ◽  
pp. 14113-14114
Keyword(s):  
The Sun ◽  
Total Eclipse

scholarly journals The Solar and Heliospheric Observatory

1984 ◽  
Vol 86 ◽  
pp. 155-158 ◽  
Author(s):  
Giancarlo Noci
Keyword(s):  
Solar Physics ◽  
Grazing Incidence ◽  
Spectral Irradiance ◽  
The Sun ◽  
Solar Dynamics Observatory ◽  
Solar Constant ◽  
Heliospheric Observatory ◽  
Explorer Mission ◽  
Solar Dynamics ◽  
Euv Spectrum

In the past years several space missions have been proposed for the study of the Sun and of the Heliosphere. These missions were intended to clarify various different aspects of solar physics. For example, the GRIST (Grazing Incidence Solar Telescope) mission was intended as a means to improve our knowledge of the upper transition region and low corona through the detection of the solar EUV spectrum with a spatial resolution larger than in previous missions; the DISCO (Dual Spectral Irradiance and Solar Constant Orbiter) and SDO (Solar Dynamics Observatory) missions were proposed to gat observational data about the solar oscillations better than those obtained from ground based instruments; the SOHO (Solar and Heliospheric Observatory) mission was initially proposed to combine the properties of GRIST with the study of the extended corona (up to several radii of heliocentric distance) by observing the scattered Ly-alpha and OVI radiation, which was also the basis of the SCE (Solar Corona Explorer) mission proposal; the development of the interest about the variability of the Sun, both in itself and for its consequences in the history of the Earth, led to propose observations of the solar constant (included in DISCO).

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