Statistical Analysis on Weather Conditions at Chungbuk National University Observatory in Jincheon, Korea

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  • ABSTRACT

    Astronomical Observations at Chungbuk National University Observatory (CBNUO) with an 1 m telescope have begun since April 2008, and Near-Earth Space Survey observations also have been started since November 2010, with a 0.6 m wide field telescope developed by Korea Astronomy and Space Science Institute. To improve observational efficiency, we developed a weather monitoring system enabling automatic monitoring for the weather conditions and checking the status of the observational circumstances, such as dome status. We hope this weather monitoring system can be helpful to more than 100 Korean domestic observatories, including public outreach facilities. In this paper, we present the statistic analysis of the weather conditions collected at CBNUO for 3 years (2009- 2011) and comparisons were made for clear nights between using only humidity data and both humidity and cloud data.


  • KEYWORD

    instrumentation , observation , weather monitoring , sky condition

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  • [Fig. 1.] A charge-coupled device image taken by the cloud monitoring system. Polaris is seen at the lo-wer left part. The field of view covers very wide sky with about 60° × 82° reaching to the declination of about +24° in south direction.
    A charge-coupled device image taken by the cloud monitoring system. Polaris is seen at the lo-wer left part. The field of view covers very wide sky with about 60° × 82° reaching to the declination of about +24° in south direction.
  • [Table 1.] Properties of characteristics of the cloud monitoring system.
    Properties of characteristics of the cloud monitoring system.
  • [Fig. 2.] The structure of the developed weather monitoring system. The automatic weather monitoring system (AWS) data logger measures all of weather information through and transfers them to the server. The cloud monitoring system measures the night skies near Polaris every fifty seconds and transfers the number of stars measured as well as their images to the server.
    The structure of the developed weather monitoring system. The automatic weather monitoring system (AWS) data logger measures all of weather information through and transfers them to the server. The cloud monitoring system measures the night skies near Polaris every fifty seconds and transfers the number of stars measured as well as their images to the server.
  • [Fig. 3.] A sample webpage of the weather monitoring system operated by the CBNUO. The panel in the left top shows the humidity values measured by five humidity sensors. Left middle, the median humidity value. Left bottom, the median temperature value measured with five temperature sensors. From right top to right bottom, the pressure, wind speed, and wind direction valuses , respectively. CBNUO: Chungbuk National University Observatory.
    A sample webpage of the weather monitoring system operated by the CBNUO. The panel in the left top shows the humidity values measured by five humidity sensors. Left middle, the median humidity value. Left bottom, the median temperature value measured with five temperature sensors. From right top to right bottom, the pressure, wind speed, and wind direction valuses , respectively. CBNUO: Chungbuk National University Observatory.
  • [Fig. 4.] A sample webpage showing the star counts measured with the cloud monitoring system. The top shows the time variation of star counts while the bottom indicates the time variation of the standard deviations of the measured sky images. The increase of the standard deviation after 14 UT is due to the influence of the Moon.
    A sample webpage showing the star counts measured with the cloud monitoring system. The top shows the time variation of star counts while the bottom indicates the time variation of the standard deviations of the measured sky images. The increase of the standard deviation after 14 UT is due to the influence of the Moon.
  • [Fig. 5.] The variations of humidity and temperature measured during day time from 2009 to 2011. The diagrams show higher humidity during July and August while lo-wer humidity from October to May. The lowest temperature was about -25°. The area of Munbaekmyon, Jincheon which include the CBNUO shows to be relatively cold, when compared with near large cities. CBNUO: Chungbuk National University Observatory.
    The variations of humidity and temperature measured during day time from 2009 to 2011. The diagrams show higher humidity during July and August while lo-wer humidity from October to May. The lowest temperature was about -25°. The area of Munbaekmyon, Jincheon which include the CBNUO shows to be relatively cold, when compared with near large cities. CBNUO: Chungbuk National University Observatory.
  • [Fig. 6.] The variations of humidity and temperature measured during night time from 2009 to 2011. In contrast to the trend measured in day time, as shown in Fig. 5, most of the mean humidity approach to nearly 90%, which may be partly influenced by a rivulet near the CBNUO and may be a common characteristic of most domestic countryside. CBNUO: Chungbuk National University Observatory.
    The variations of humidity and temperature measured during night time from 2009 to 2011. In contrast to the trend measured in day time, as shown in Fig. 5, most of the mean humidity approach to nearly 90%, which may be partly influenced by a rivulet near the CBNUO and may be a common characteristic of most domestic countryside. CBNUO: Chungbuk National University Observatory.
  • [Fig. 7.] The yearly statistics of the observable times during 2009-2011. Left top shows the distributions of mean and maximum observable times. Left bottom: the percentages of monthly observable times. Right top: the distributions of monthly mean and maximum observable times. Right bottom: the percentages of monthly observable times.
    The yearly statistics of the observable times during 2009-2011. Left top shows the distributions of mean and maximum observable times. Left bottom: the percentages of monthly observable times. Right top: the distributions of monthly mean and maximum observable times. Right bottom: the percentages of monthly observable times.
  • [Fig. 8.] The monthly distribution of the observable days. As expected, the observable nights. for the rainy season from June to August are small.
    The monthly distribution of the observable days. As expected, the observable nights. for the rainy season from June to August are small.
  • [Fig. 9.] The yearly statistics for total observing nights. with the 1 m reflector of the CBNUO. Left shows the statistics for the total observed nights. while the left the yearly mean observed nights. CBNUO: Chungbuk National University Observatory.
    The yearly statistics for total observing nights. with the 1 m reflector of the CBNUO. Left shows the statistics for the total observed nights. while the left the yearly mean observed nights. CBNUO: Chungbuk National University Observatory.
  • [Fig. 10.] The distribution of observing times with the 1 m reflector of the CBNUO from March 2009 to June 2011. The gaps during September 2009 and September 2011 were due to the break-down of the telescope. CBNUO: Chungbuk National University Observatory.
    The distribution of observing times with the 1 m reflector of the CBNUO from March 2009 to June 2011. The gaps during September 2009 and September 2011 were due to the break-down of the telescope. CBNUO: Chungbuk National University Observatory.
  • [Fig. 11.] The program stars observed with the 1 m reflector of the CBNUO. Both of UU Cam and V1130 Tau have been observed for nearly 60 days. CBNUO: Chungbuk National University Observatory.
    The program stars observed with the 1 m reflector of the CBNUO. Both of UU Cam and V1130 Tau have been observed for nearly 60 days. CBNUO: Chungbuk National University Observatory.
  • [Fig. 12.] The yearly statistics of observations with the 0.6 m wide view reflector. The left and right panels show the observed nights and mean hours, respectively. The 0.6 m telescope has been stably operated since its installation in November 2010. CBNUO: Chungbuk National University Observatory.
    The yearly statistics of observations with the 0.6 m wide view reflector. The left and right panels show the observed nights and mean hours, respectively. The 0.6 m telescope has been stably operated since its installation in November 2010. CBNUO: Chungbuk National University Observatory.
  • [Fig. 13.] The distribution of the observation times with the 0.6 m telescope from November 2010 to December 2011. Most observations were made during the autumn and winter seasons.
    The distribution of the observation times with the 0.6 m telescope from November 2010 to December 2011. Most observations were made during the autumn and winter seasons.
  • [Fig. 14.] The program stars observed with the 0.6 m reflector. Most of program stars are variable stars with some exception such as a comet (147P/Kushida-Muramatsu) and a minor planet (1906ua).
    The program stars observed with the 0.6 m reflector. Most of program stars are variable stars with some exception such as a comet (147P/Kushida-Muramatsu) and a minor planet (1906ua).