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• W2001766256 abstract "view Abstract Citations (1) References Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Thermocouple measurements during the partial solar eclipse of February 25, 1952. Abbott, W. Abstract During the eclipse of the sun of February 25, 1952, which was partial in Greece, observations of solar radiation were made at the Observatory of Athens by the Meteorological Institute. The measurements were made by means of a Knoll thermocouple pyrheliometer, directed on the sun and having a field of 30 diameter, and a Grozynski thermocouple solarimeter registering integrated sun and sky radiation. The pyrheliometer measurements were made both without filter and with the following filters: red, RG I, transmitting from 2.8 ~ to o.6 i ; blue, BG 8, transmitting from 2.8 ~ to 1.2 ~ and from 0.65 ~ to 0.35 i ; yellow, GG 5, transmitting from 2.8 ~ to 0.45 ~. Control measurements were made during the two days preceding the eclipse. These days were meteorologically identical with eclipse day. On all three days the atmosphere was very pure, so that the curves obtained on the three days are comparable. The comparisons show that the intensity of the radiation began to fall off not at first contact, but 1h ~~m earlier. The effect is not equally marked on all color curves. Particularly convincing is a pre-first-contact effect, which occurred 12 minutes before first contact, and amounted to a falling off by 2.5 per cent of the solar constant. According to our measurements the normal intensity of radiation was reached 1h 27m after last contact. Hence the return to normal radiation is symmetrical in time with the falling-off before first contact, though the intensity curves show distinct deviations from symmetry. The observed effects are probably due to the influence of the penumbra on the diffused radiation in the atmosphere as a whole and to the entrance within the field of the pyrheliometer of the point of intersection of the penumbra with the high atmosphere, a short time before first contact and its presence there for a few minutes after last contact. It is possible to calculate from the observed data the height of the level in the atmosphere at which such optical effects become appreciable. A formula applicable to the present case was developed. It is suggested that similar observations be carried out at high altitude observatories. Observations outside eclipses, but at close appulses, will also be of interest. It is essential that meteorological conditions on consecutive days permit obtaining reliable comparison data. Observatory of Athens, Athens, Greece Publication: The Astronomical Journal Pub Date: 1953 DOI: 10.1086/106882 Bibcode: 1953AJ.....58Q..33A full text sources ADS |" @default.
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• W2001766256 date "1953-01-01" @default.
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• W2001766256 title "Thermocouple measurements during the partial solar eclipse of February 25, 1952." @default.
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