A new method for calculating the clear day total ozone amount was obtained by the regression analysis of the observation data of ozone,solar UV radiation, and meteorological parameters.With this method the monthly mea...A new method for calculating the clear day total ozone amount was obtained by the regression analysis of the observation data of ozone,solar UV radiation, and meteorological parameters.With this method the monthly mean total ozone amounts for the year 1991 in Beijing were calculated. Generally, the calculated values agree well with the Dobson spectrophotometer measurements, the average relative deviation between them being less than 2. 2%. According to the F-test,the photochemical reactions in the atmosphere,the solar UV radiation,and the aerosols are three most important factors to affect the column total ozone amount.展开更多
Persistent outflows have recently been detected at the boundaries of some active regions. Although these outflows are suggested to be possible sources of the slow solar wind, the nature of these outflows is poorly und...Persistent outflows have recently been detected at the boundaries of some active regions. Although these outflows are suggested to be possible sources of the slow solar wind, the nature of these outflows is poorly understood. Through an analy- sis of an image sequence obtained by the X-Ray Telescope onboard the Hinode spacecraft, we found that quasi-periodic outflows are present in the boundary of an active region. The flows are observed to occur intermittently, often with a period of 5-10 min. The proj ected flow speed can reach more than 200 km s^-1, while its distribution peaks around 50 km s^-1. This sporadic high-speed outflow may play an important role in the mass loading process of the slow solar wind. Our results may imply that the outflow of the slow solar wind in the boundary of the active region is intermittent and quasiperiodic in nature.展开更多
文摘A new method for calculating the clear day total ozone amount was obtained by the regression analysis of the observation data of ozone,solar UV radiation, and meteorological parameters.With this method the monthly mean total ozone amounts for the year 1991 in Beijing were calculated. Generally, the calculated values agree well with the Dobson spectrophotometer measurements, the average relative deviation between them being less than 2. 2%. According to the F-test,the photochemical reactions in the atmosphere,the solar UV radiation,and the aerosols are three most important factors to affect the column total ozone amount.
基金supported by the National Natural Science Foundation of China (Grant Nos.40874090 and 40931055)
文摘Persistent outflows have recently been detected at the boundaries of some active regions. Although these outflows are suggested to be possible sources of the slow solar wind, the nature of these outflows is poorly understood. Through an analy- sis of an image sequence obtained by the X-Ray Telescope onboard the Hinode spacecraft, we found that quasi-periodic outflows are present in the boundary of an active region. The flows are observed to occur intermittently, often with a period of 5-10 min. The proj ected flow speed can reach more than 200 km s^-1, while its distribution peaks around 50 km s^-1. This sporadic high-speed outflow may play an important role in the mass loading process of the slow solar wind. Our results may imply that the outflow of the slow solar wind in the boundary of the active region is intermittent and quasiperiodic in nature.
