On the veiled solar spots

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Abstract
It is now pretty well established that the visible surface of the sun is a gaseous envelope called the chromosphere ; mainly composed of incandescent hydrogen gas, with which are occasionally associated some metallic vapors usually occupying the lower strata. To all appearances, the granulations called rice grains,'7 the faculse and the protuberances, are phenomena belonging to the chromosphere ; in fact, they are the chromosphere itself seen under the particular forms and aspects peculiar to it. Ordinarily this envelope has a thickness of or 15n. This thickness, however, is by no means constant, varying from day to day within certain narrow limits. At no time since I have observed the sun, have I seen the chro mosphere so thin and shallow as during the present year, and especially between June 10 and August 18. I had before quite often observed local depressions and upheavals of the chromosphere, sometimes ex tending over large surfaces, but I had never before observed such a general subsidence. So thin was the chromosphere during this period, that it was some times very difficult to obtain its spectrum by placing the slit of the spectroscope tangent to the limb of the sun. This was especially the case on the afternoon of August 9. This unusual thinness of the chromosphere could be easily recognized without the assistance of the spectroscope. Indeed, the phenomenon was even more interesting seen through the telescope, as, with it, the structure of the photosphere, lying as it does under the envelope of the chromosphere, could be better seen through the thin veil formed by the greatly attenuated chromospheric gases. That the gases forming the chromosphere are sometimes thin enough to become transparent is a phenomenon which I have observed hun dreds of times ; as is abundantly proved by the numerous drawings of
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Authors L. Trouvelot
Journal american journal of science
Year 1876
DOI
10.2475/ajs.s3-11.63.169
URL
https://doi.org/10.2475/ajs.s3-11.63.169
Keywords Keywords not found

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