 | Richard Anthony Proctor - 1876 - 586 pages
...greater or less magnitude, either slowly sinking or suspended in equilibrium in a gaseous medium. 3. A spot including both umbra and penumbra is a phenomenon which takes places beneath the level of the Sun's photosphere. As respects the sequent series of researches by... | |
 | Alexander Ramsay - 1884 - 538 pages
...less magnitude, either slowly sinking or suspended in equilibrium in a gaseous medium ;" (3) " that a spot including both umbra and penumbra is a phenomenon which takes place beneath the level of the sun's photosphere."1 It is also found that the luminous flakes called "Nasmyth's willow leaves " (or " Huggins's... | |
 | 1884 - 472 pages
...less magnitude, either slowly sinking or suspended in equilibrium in a gaseous medium ;" (3) " that a spot including both umbra and penumbra is a phenomenon which takes place beneath the level of the sun's photosphere."1 It is also found that the luminous flakes called " Naemyth's willow leaves " (or " Huggins's... | |
 | 1867 - 900 pages
...a spot without producing any permanent alteration. We are on these accounts disposed to think that a spot including both umbra and penumbra is a phenomenon which takes place beneath the level of the brighter part of the sun's photosphere. 28. Let us here recapitulate the answers we have given to our... | |
 | 1866 - 452 pages
...or is it of the nature either of a gas or cloud ? 3. Is a spot (including both umbra and penumbra) a phenomenon which takes place beneath the level of the sun's photosphere, or above it ?" An account of the method of investigation in each case is given in the paper. The first... | |
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A spot including both umbra and penumbra is a phenomenon which takes place beneath the level of the Sun's photosphere. 
