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Anoop Mishra R.M. Gairola A.K. Varma Abhijit Sarkar Vijay K. Agarwal 《Advances in Space Research (includes Cospar's Information Bulletin, Space Research Today)》2009,44(7):815-823
Present study focuses on the estimation of rainfall over Indian land and oceanic regions from the Special Sensor Microwave/Imager (SSM/I) on the Defense Meteorological Satellite Program (DMSP) F-13. Based on the measurements at 19.35, 22.235 and 85.5 GHz channels of SSM/I Satellite, scattering index (SI) has been developed for the Indian land and oceanic regions separately. These scattering indices were co-located against rainfall from Precipitation Radar (PR) onboard Tropical Rainfall Measuring Mission (TRMM) to develop a new regional relationship between the SI and the rain rate for the Indian land and oceanic regions. A non-linear fit between the rain rate and the SI is established for rain measurement. In order to have confidence in our method, we have also estimated rainfall using the global rainfall and scattering index relationship developed by Ferraro and Marks [Ferraro, R.R., Marks, G.F. The development of SSM/I rain rate retrieval algorithms using ground based radar measurements. J. Atmos. Ocean. Technol. 12, 755–770, 1995]. The validation with the rain-gauge shows that the present scheme is able to retrieve rainfall with better accuracy than that of Ferraro and Marks (1995). Further intercomparison with TRMM-2A12 and validation with rain-gauges rainfall showed that the present algorithm is able to retrieve the rainfall with reasonably good accuracy. 相似文献
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Apurba Saha Anirban Guha Barin Kumar De Rakesh Roy Abhijit Choudhury Trisanu Banik Pranab Dhar Monti Chakraborty 《Advances in Space Research (includes Cospar's Information Bulletin, Space Research Today)》2014
To investigate the precursory signature of earthquakes on low frequency (LF) signal propagation, six earthquakes, having magnitude greater than equal to 6.5 and depth less than equal to 30 km, are being studied. The base line level of 40 kHz signal, transmitted from JJY station, Japan, is analysed with respect to Vd statistical parameter. Results show that the Vd parameter values starts fluctuating from its ambient levels before and during the days of the earthquakes, with significant variation starting 1–3 days prior to the earthquake concerned. This present study is an approach for identifying the precursory signatures of earthquakes on LF signal propagation using a new methodology with Vd parameter. 相似文献
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H.C. Thejaswini Abhijit MajumdarTin Maung Tun Rainer Hippler 《Advances in Space Research (includes Cospar's Information Bulletin, Space Research Today)》2011
Plasma chemical reactions in C2H2/N2, C2H4/N2, and C2H6/N2 gas mixtures have been studied by means of mass spectrometry at a medium pressure of 300 mbar in a laboratory dielectric barrier discharge. A major reaction scheme is production of larger hydrocarbons like CnHm with n up to 12 including formation of functional CN groups. 相似文献
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