Density and temperature diagnostics of solar emission lines from NeV/MgV and SiVII/MgVII Ions     

Anita Mohan  B. N. Dwivedi  P. K. Raju 《Journal of Astrophysics and Astronomy》1999,20(1-2):51-65

We present NeV/MgV and SiVII/MgVII theoretical line intensity ratios as a function of electron densityN _e and temperatureT _e . These are shown in the form of ratio-ratio diagrams, which should in principle allow bothN _e andT _e to be deduced for the emitting region of the solar plasma. We apply these diagnostics in the solar atmosphere, and discuss the available observations made from space. In most cases, however, we deduceN _e andT _e from the computed absolute line intensities in a spherically symmetric model atmosphere of the Sun. Possible future applications of this investigation to spectral data from the Coronal Diagnostic Spectrometer (CDS) on the Solar and Heliospheric Observatory (SOHO) are briefly discussed.  相似文献   

Do Skeletal Networks Derived from Water Bodies Follow Horton's Laws?     

B. S. Daya Sagar  M. Venu  K. S. R. Murthy 《Mathematical Geology》1999,31(2):143-154

The aim of this short note is to test whether the morphological skeletal network (MSN) of water bodies that resembles a river network follows Horton's laws. A fractal relationship of MSN of a water body is also shown. This investigation shows that the MSN of the Nizamsagar reservoir follows Horton's laws. Furthermore, this reservoir has a fractal dimension (D _m) of 1.92 which was computed by using two morphometric quantities and the fractal dimension of the main skeletal length (d). This value tallies exactly with the fractal dimension (D _f) of the whole MSN computed through box-counting method.  相似文献   

Do Skeletal Networks Derived from Water Bodies Follow Horton's Laws?     

Sagar  B. S. Daya  Venu  M.  Murthy  K. S. R. 《Mathematical Geosciences》1999,31(2):143-154

The aim of this short note is to test whether the morphological skeletal network (MSN) of water bodies that resembles a river network follows Horton's laws. A fractal relationship of MSN of a water body is also shown. This investigation shows that the MSN of the Nizamsagar reservoir follows Horton's laws. Furthermore, this reservoir has a fractal dimension (D _m) of 1.92 which was computed by using two morphometric quantities and the fractal dimension of the main skeletal length (d). This value tallies exactly with the fractal dimension (D _f) of the whole MSN computed through box-counting method.  相似文献   

Erratum to: Internal waves over the shelf in the western Bay of Bengal: a case study     

Madhu Joshi  Ambarukhana Devendra Rao  Sachiko Mohanty  Himansu Kesari Pradhan  Vadlamani S. N. Murty  Koneru Venkata Siva Rama Prasad 《Ocean Dynamics》2017,67(1):163-164

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Detection of ionospheric scintillation effects using LMD–DFA     

Raghavendra Vishnu Tadivaka  Bhanu Priyanka Paruchuri  Sridhar Miriyala  Padma Raju Koppireddi  Venkata Ratnam Devanaboyina 《Acta Geophysica》2017,65(4):777-784

The performance and measurement accuracy of global navigation satellite system (GNSS) receivers is greatly affected by ionospheric scintillations. Rapid amplitude and phase variations in the received GPS signal, known as ionospheric scintillation, affects the tracking of signals by GNSS receivers. Hence, there is a need to investigate the monitoring of various activities of the ionosphere and to develop a novel approach for mitigation of ionospheric scintillation effects. A method based on Local Mean Decomposition (LMD)–Detrended Fluctuation Analysis (DFA) has been proposed. The GNSS data recorded at Koneru Lakshmaiah (K L) University, Guntur, India were considered for analysis. The carrier to noise ratio (C/N₀) of GNSS satellite vehicles were decomposed into several product functions (PF) using LMD to extract the intrinsic features in the signal. Scintillation noise was removed by the DFA algorithm by selecting a suitable threshold. It was observed that the performance of the proposed LMD–DFA was better than that of empirical mode decomposition (EMD)–DFA.  相似文献   

Observed oceanic response to tropical cyclone Jal from a moored buoy in the south-western Bay of Bengal   总被引：1，自引：1，他引：0  

M. S. Girishkumar  K. Suprit  Jayaram Chiranjivi  T. V. S. Udaya Bhaskar  M. Ravichandran  R. Venkat Shesu  E. Pattabhi Rama Rao 《Ocean Dynamics》2014,64(3):325-335

Upper oceanographic and surface meteorological time-series observations from a moored buoy located at 9.98°N, 88°E in the south-western Bay of Bengal (BoB) were used to quantify variability in upper ocean, forced by a tropical cyclone (TC) Jal during November 2010. Before the passage of TC Jal, salinity and temperature profiles showed a typical BoB post-monsoon structure with relatively warm (30 °C) and low-saline (32.8 psu) waters in the upper 30- to 40-m layer, and relatively cooler and higher salinity (35 psu) waters below. After the passage of cyclone, an abrupt increase of 1 psu (decrease of 1 °C) in salinity (temperature) in the near-surface layers (up to 40-m depth) was observed from buoy measurements, which persisted up to 10–12 days during the relaxation stage of cyclone. Mixed layer heat budget analysis showed that vertical processes are the dominant contributors towards the observed cooling. The net surface heat flux and horizontal advection together contributed approximately 33 % of observed cooling, during TC Jal forced stage. Analysis showed the existence of strong inertial oscillation in the thermocline region and currents with periodicity of ～2.8 days. During the relaxation stage of the cyclone, upward movement of thermocline in near-inertial frequencies played significant role in mixed layer temperature and salinity variability, by much freer turbulent exchange between the mixed layer and thermocline.  相似文献   

UV/Peroxyacetic Acid Mediated Chlorophenol Congener Degradation          下载免费PDF全文

Swati Sharma  Zagabathuni Venkata Panchakshari Murthy 《洁净——土壤、空气、水》2014,42(3):276-283

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Coral Reef Bleaching at Agatti Island of Lakshadweep Atolls,India     

Ramar Vinoth  Mohan Gopi  Thipramalai Thankappanpillai  Ajith Kumar  Thirunavukarassu Thangaradjou  Thangavel Balasubramanian 《青岛海洋大学学报(英文版)》2012,(1):105-110

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Observed year-to-year sea surface salinity variability in the Bay of Bengal during the 2009–2014 period     

Akurathi Venkata Sai Chaitanya  Fabien Durand  Simi Mathew  Vissa Venkata Gopalakrishna  Fabrice Papa  Matthieu Lengaigne  Jerome Vialard  Chanda Kranthikumar  R. Venkatesan 《Ocean Dynamics》2015,65(2):173-186

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Erratum to: Observed year-to-year sea surface salinity variability in the Bay of Bengal during the 2009–2014 period     

Akurathi Venkata Sai Chaitanya  Fabien Durand  Simi Mathew  Vissa Venkata Gopalakrishna  Fabrice Papa  Matthieu Lengaigne  Jerome Vialard  Chanda Kranthikumar  R. Venkatesan 《Ocean Dynamics》2015,65(3):467-467

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