• Solar Energy
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• v.14 no.2
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• pp.61-74
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• 1994

Since the atmospheric clearness index is main factor for evaluating atmosphere circumstance, it is necessary to estimate its characteristics all over the cities in Korea. We have began collecting clearness index data since 1982 at 16 different cities and considerable effort has been made for constructing a standard value from measured data at each city. The new clearness index data will be extensively used by evaluating atmospheric circumstance analysies as well as by solar application system designer or users. From the results, we can conclude that 1) Yearly mean 63% of the atmospheric clearness index was evaluated for clear day all veer 16 cities in Korea. 2) Atmospheric clearness index of spring and summer were 63% and 64% and for fall and winter their values wre 61% and 59% respectively. So, spring and summer were higher, and fall and winter were lower then the yearly value. 3) A significant difference of atomospheric clearness index is observed between $1982{\sim}1987$ and $1988{\sim}1993$ through 16 different cities in Korea.

• Bulletin of Korea Environmental Preservation Association
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• v.21 no.3_4
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• pp.17-18
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• 1999

• The Bulletin of The Korean Astronomical Society
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• v.42 no.2
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• pp.70.3-70.3
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• 2017

맑은 날에도 엷은 상층운이나 난류의 방해로 관측 품질이 저해되는 등 천문 분야는 대기환경에 민감하나, 하층 대기 상태에 비중을 두는 동네예보만으로는 천문 분야의 기상정보에 대한 수요를 충족하기에는 한계가 있다. 이에 천문 관측 환경에 보다 특화된 별밤예보를 개발하여 천체 관측 가능성과 천문 관측 자료의 품질을 좌우하는 대기상태를 UM 국지모델 생산자료를 바탕으로 예보하고자 한다. 예보 요소는 하늘상태(운량), 시상(seeing), 투명도, 암도(darkness) 및 대기청명지수, 풍속, 기온, 습도이다. 대기청명지수는 일반인이 관찰하기 좋은지 여부를 한 눈에 알 수 있게 운량과 투명도, 암도를 종합한 지수로 10~100까지 10단계로 제공할 계획이다. 하늘상태와 풍속, 기온, 습도는 $5{\times}5km$격자마다 제공되는 기상청 동네예보에서 천문대와 가장 가까운 격자의 예보치를 추출하였다. 시상은 대기의 난류 정도에 좌우된다. 그러나 충북의 고층기상 관측자료가 없어서, 시상 예보식을 만들기 위해 UM 국지모델에서 제공하는 각 등압면의 기온과 바람벡터로부터 정적 안정도(온위 경도)와 연직 바람시어를 유도한 뒤, 다중회귀분석으로 시상 예보식을 구하였다. 또한 대기청명지수는 청주기상지청에서 관측한 운량과 밤하늘 밝기 자료를 종속변수, 별의 개수를 독립변수로 하는 다중회귀예측식을 구하였다.

• 한국신재생에너지학회:학술대회논문집
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• 2009.06a
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• pp.239-242
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• 2009

Since the atmospheric clearness index is main factor for evaluating atmosphere environment, it is necessary to estimate its characteristics all over the major cities in Korea. We have begun collecting clearness index data since 1982 at 16 different cities and considerable effort has been made for constructing a standard value from measured data at each city. The new clearness data will be extensively used by evaluating atmospheric environment analysts as well as by solar application designers or users. From the results, yearly mean 63.6 % of the atmospheric clearness index was evaluated for clear day all over in Korea

• 한국신재생에너지학회:학술대회논문집
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• 2008.10a
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• pp.174-177
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• 2008

The amount of incident solar rays on inclined surfaces with various directions has Since the atmospheric clearness index is main factor for evaluating atmosphere environment, it is necessary to estimate its characteristics all over the major cities in Korea Peninsula. We have begun collecting clearness index data since 1982 at 16 different cities in South Korea and estimated using empirical forecasting models at 12 different stations over the North Korea from 1982 to 2006. This considerable effort has been made for constructing a standard value from measured data at each city. The new clearness data for global-dimming analysis will be extensively used by evaluating atmospheric environment as well as by solar application system designer or users.

• 한국신재생에너지학회:학술대회논문집
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• 2006.11a
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• pp.153-156
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• 2006

The domestic solar radial ion data have been measured at 16 different sites all over the country since the beginning of 1980. It is very important that the fundamental data for the estimation and assessment of local solar radiation can be secured this project. In order to estimate available energy resource from solar radiation, it is necessary to have enough data, more than 30 years In any country. However since we have collected solar radiation(global radial ion including direct normal radiation) data only for 10 years we still need to measure insolation to secure the reliability and standardization of measured local solar radial ion data. In brief, the major activities on this R&D include rout me maintenance of the national network for insolation data measurement, evaluation of the collected data, and reliability enhancement for assessing the quality of solar radiation data as well.

• Journal of the Korean Solar Energy Society
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• v.31 no.1
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• pp.87-92
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• 2011

Since the atmospheric clearness index is main factor for evaluating atmosphere environment, it is necessary to estimate its characteristics all over the major cities in Korea. We have begun collecting clearness index data since 1982 at 16 different cities and considerable effort has been made for constructing a standard value from measured data at each city. The new clearness data will be extensively used by evaluating atmospheric environment as well as by solar application system designer or users. Yearly mean 64% of the atmospheric clearness index was evaluated for clear day all over, and significant difference of horizontal global insolation is observed between 1982~1986 and 1987~1991, 1992~1996, 1997~2001, 2002~2009 through 16 different cities in Korea.

• 한국태양에너지학회:학술대회논문집
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• 2009.11a
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• pp.68-73
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• 2009

Since the atmospheric clearness index is main factor for evaluating atmosphere environment, it is necessary to estimate its characteristics all over the major cities in Korea Peninsula. We have begun collecting clearness index data since 1982 at 16 different cities in South Korea and estimated using empirical forecasting models at 21 different stations over the North Korea from 1982 to 2008. This considerable effort has been made for constructing a standard value from measured data at each city. The new clearness data for global-dimming analysis will be extensively used by evaluating atmospheric environment as well as by solar PV application system designer or users. From the results, we can conclude that. 1) Yearly mean 63.5 % of the atmospheric clearness index was evaluated for clear day all over the 37 cities in Korea Peninsula, 2) Clear day's atmospheric clearness index of spring and summer were 64.6% and 64.8%, and for fall and winter their values were 63.3% and 61.3% respectively in Korea Peninsula.

• Journal of the Korean Solar Energy Society
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• v.28 no.4
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• pp.25-34
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• 2008

Since the atmospheric clearness index is main factor for evaluating atmosphere environment, it is necessary to estimate its characteristics all over the major cities in Korea Peninsula. We have begun collecting clearness index data since 1982 at 16 different cities in South Korea and estimated using empirical forecasting models at 21 different stations over the North Korea from 1982 to 2006. This considerable effort has been made for constructing a standard value from measured data at each city. The new clearness data for global-dimming analysis will be extensively used by evaluating atmospheric environment as well as by solar PV application system designer or users. From the results, we can conclude that 1) Yearly mean 63.5 % of the atmospheric clearness index was evaluated for clear day all over the 37 cities in Korea Peninsula, 2) Clear day's atmospheric clearness index of spring and summer were 64.6 % and 64.8 %, and for fall and winter their values were 63.3 % and 61.3% respectively in Korea Peninsula.

• Journal of the Korean Solar Energy Society
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• v.27 no.2
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• pp.45-52
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• 2007

Since the atmospheric clearness index is main factor for evaluating global-dimming of atmosphere environment, it is necessary to estimate its characteristics all over the major cities in Korea. We have begun collecting clearness index data since 1982 at 16 different cities and considerable effort has been made for constructing a standard value from measured data at each city. The new clearness data for global-dimming analysis will be extensively used by evaluating atmospheric environment as well as by solar PV application system designer or users. From the results, we can conclude that 1) Yearly mean 61.9% of the atmospheric clearness index was evaluated for clear day all over 2) A significant difference of atmospheric clearness index is observed between 1982-1989 and 1990-1997, 1998-2005 through 16 different cities in Korea.