Journal of the Meteorological Society of Japan. Ser. II
Online ISSN : 2186-9057
Print ISSN : 0026-1165
ISSN-L : 0026-1165
Volume 27, Issue 2
Displaying 1-5 of 5 articles from this issue
  • Y. Kawabata, K. Otani
    1949 Volume 27 Issue 2 Pages 33-38
    Published: June 30, 1949
    Released on J-STAGE: February 05, 2009
    Leaving the summit, where we had done observations before whose result we have already reported, we removed the observation tent to the top of a cliff very near to the seashore. The cliff is about 40 m. in height, and faces the Pacific Ocean to southern direction.
    (a) When we observe the sea surface from such a low level, it seems that the light which comes to the observer from the sea is consisted of sky light reflected by wavelets of the sea surface. Therefore, the condition of its polarization depends mainly upon the nature of the sky light which is reflected by the sea surface. And consequently, in this case, the polarization phenomena can not sufficiently be explained merely by the theory of Rayleigh's scattering as in the former case, and so we have proposed that it is necessary to take into account the Brewster's law of reflection too to explain the polarization.
    (b) In the case of clear skies, degrees and planes of polarization of light reflected by the sea surface varies parallel to those of the sky light from the zone at an altitude of about 10° in the same direction. In the case of overcast skies, the planes of polarization are always vertical for all directions.
    The range of variation in degrees of polarization is 0.1_??_0.4 for the light from the sea, and 0.0_??_0.7 for that from the sky.
    (c) As to the relation to bearings, such conspicuous correlation as seen in the preceding chapter can not be found, except in the case of clear and calm weather.
    (d) The degree of polarization changes abruptly at the sea horizon. Thus the contrast between the sky and sea surface can be increa_??_ed by using the polarized light in most cases, except in the direction at right angles to the vertical plane passing through the sun. This seems to be an important fact concerning the contribution of the Polaroid to the improvement of visibility at sea.
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  • T. Okano, S. Homma
    1949 Volume 27 Issue 2 Pages 39-44
    Published: June 30, 1949
    Released on J-STAGE: February 05, 2009
    In Part 1, we showed that the time variation of the velocity of seismic wave was connected with Hayakawa's theory by our method. But in a few cases, this relation seems to be reversed, and in much more cases we cannot find any clear relation, probably owing to the complicated conditions in the earth's crust there. If the part of the path across the compression area a_??_d dilation area of the intermediate shocks has the same order of length, the condition becomes more difficult. Some examples of pattern in such cases are considered theoretically and compared with actual cases with fairly good agreement.
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  • M. Hanzawa
    1949 Volume 27 Issue 2 Pages 44-47
    Published: June 30, 1949
    Released on J-STAGE: February 05, 2009
    The structure and activity of the Siberian Pc air-mass of Winter season in the Far Eastern Asia were studied from the stand point of air-mass theory, especially by Wexler's method, using radiosonde data.
    The results obtained by the author are summarized as follows:-
    1) The exact height of the Siberian Pc air-mass was determined.
    2) A linear relation between height, and temperature of the Siberian Pc air-mass was found. Namely, the temperature of the Pc air-mass decreases as its _??_ight increases.
    2) Theoretical, value of the height of the Pc air-mass was also compared with the observed value.
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  • K. Yakame
    1949 Volume 27 Issue 2 Pages 47-52
    Published: June 30, 1949
    Released on J-STAGE: February 05, 2009
    This distant wind meter can be used wherever the transmitter and the receiving station are in an unobstructed view. The transmitter of the wind meter consists of a wind vane, a cup anemometer, a clock with electric contacts and a oscillator. The power of the oscillator is about 0.3 watt.
    The carrier wave of ultra short wave is modulated by a low frequency wave which is varied by the motion of the wind vane. The indicator of the wind direction of the vibrating reed frequency meter is directly connected with the receiver. The wind velocity is measured through the audio-signal that is generated every 100 meter range of wind course.
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  • G. Yamamoto, G. Onishi
    1949 Volume 27 Issue 2 Pages 52-64
    Published: June 30, 1949
    Released on J-STAGE: February 05, 2009
    In the present paper absorption coefficlent of water vapour in the far infra-red region beyond 5μ was calculated quantun-mechanically by the method of Elsasser. Main points introduced in the present papr are summarised as follows: i). intensity of an absorption line was calculated by the new method of King, Hainer and Cross instead of Randall, Dennison, Ginsburg and Weber's approximate calculation employed by Elsasser, ii). Van Vleck and Weisskopf's investigation on the line shape, and Becker and Autler's investigation on half-width of a line were referenced, iii) recent investigations of Van Vleck and King, Hainer and Cross were referenced, and several lines expected by their theory were employed in calculationg absorption coefficient. iv). absorption coefficient of ν2 band between 5μ and 8μ, which Elsasser did not calculated theoretically owing to the lack of available data at that time, was calculated by employing Nielsen's and other data.
    The comparison of our results with those of Elsasser shows that in band our values of generalized absorption coeffioient which is introduced by Elsasser are much larger than those of Elsasser. It must be remarked that Elsasser's values for ν2 band are those assumed from the measurements of Fowle and Hettner, and are not calculated theoretically. Also in the intermediate region between 8μ and 25μ, our values of absorption coefficient are to some degree larger than those of Elsasser. This may probably due to the fact that the line shape assumed by us are different from Elsasser's assumption. In the rotational band beyond 17μ both Elsasser's and our values of generalized absorption coefficient are practically came.
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