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Repercussions of solar high energy protons on ozone layer during super storms

Research in Astronomy and Astrophysics 2019年第1期19卷 21-28页

作者： asheesh bhargawa Mohd Yakub Ashok Kumar Singh Department of Physics University of Lucknow

We are very aware of the importance of the ozone layer, without which life on the Earth would not have evolved in the way it has. Solar storms carry energetic protons into the Earth's upper atmosphere,where they boost production of nitrogen oxides which are known as ozone killers and which ultimately increase ultraviolet(UV) radiations. In the present study, we estimate the effects of solar energetic protons during super storms(Dst index <-300 nT) over the total ozone column for the last 32 yr. We select a total of seven super storm events that occurred during solar cycles 22–24(for the last 32 yr) having Dst index <-300 nT. To that end, we apply superposed epoch analysis(SEA) to verify the impact of storm events on the quantitative variation of total ozone column and on UV radiations during super storm *** completing the empirical analysis, we conclude that the ozone column gets depleted significantly(22±6.8%) as proton density increases during super storm events and this decrement in the ozone level is further responsible for a substantial increase(26±11.2%) in peak UV radiation intensities.

关键词： Sun:particle emission Sun:solar terrestrial relations Sun:astroparticle physics Sun:Physical Data and Processes

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Perceiving the Trend of Terrestrial Climate Change during the Past 40 year(1978-2018)

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Journal of Atmospheric Science Research 2021年第1期4卷 1-15页

作者： asheesh bhargawa A.K.Singh Physics Department University of LucknowLucknow-226007India

In past few decades,climate has manifested numerous shifts in its *** natural and anthropogenic factors have influenced the dynamics and the trends of climate change at longer time *** understand the long term climate fluctuations,we have analyzed forty years(1978-2018)data of ten climatic parameters that are responsible to influence the climate *** parameters involved in the present study are total solar irradiance(TSI),ultra violet(UV)index,cloud cover,carbon dioxide(CO2)abundances,multivariate(ENSO)index,volcanic explosivity index(VEI),global surface temperature(GST)anomaly,global sea ice extent,global mean sea level and global precipitation *** the above mentioned climate entities;we have constructed a proxy index to study the quantitative measure of the climate *** this process these indicators were aggregated to a single proxy index as global climate index(GCI)that has measured the strength of present climate change in semblance with the past natural *** construct GCI,the principal component analysis(PCA)has been used on yearly based data for the period *** PCA is a statistical tool with which we can reduce the dimensionality of the data and it retains most of the variation in the new data ***,we have confined our study to natural climate drivers and anthropogenic climate *** result has indicated that the strongest climate change has been occurred globally by the end of the year 2018 in comparison to late 1970’s natural variability.

关键词： Principal component analysis Total solar irradiance(TSI) Cloud cover CO2 abundance Global surface temperature(GST)anomaly Global climate index(GCI)

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