Papers

Cosmic ray neutron monitor data of Haleakala station are used for an extensive study of cosmic ray diurnal and semi-diurnal variation for the period of 1995 to 2006. We have derived an average characteristics of first two harmonics of cosmic ray daily variation. The amplitude of the diurnal/semi diurnal variation has an eleven year cycle. Time of maxima exhibits a 22 year cycle for diurnal anisotropy

This paper present the importance of remote sensing data for identification of geomorphic features pertaining to Ratlam region located in Madhya Pradesh. Geologically, Ratlam area constitutes a part of Malwa Plateau belonging to the Deccan Volcanic Province ranging in age from Upper Cretaceous to Eocene.

Based on the visual interpretation of the satellite data four geomorphic units have been recognized. These are alluvial plain, lava plain, buried lava plain, and lava plateau. The characteristic features of various geomorphic units are of valuable aid in delineation of favourable water yielding bodies in the Ratlam area.

Different types of whistlers and VLF emissions recorded during day and night times are reported at our newly set-up ground station Srinagar (geomag. lat. 24^o 10^/ N). Dispersion analysis of whistlers recorded during March- June 2009 shows that the dispersion of the whistlers recorded during daytime is higher than those recorded during nighttime. Daytime whistlers are found to appear during very restricted hours in the late afternoon. On the other hand, nighttime whistlers are observed over a wide time interval but generally peak in the early morning, and their dispersion is widely distributed. Further our data analysis shows the occurrence of different types of VLF emissions during day and night times.

Hydrogeomorphic landforms always bear direct or indirect relationship among the various parameters controlling occurrence and movement of groundwater. So, for better planning and management of groundwater resources, study of hydrogeomorphic environment is proven essential and helpful to delineate the groundwater prospect zones. The present study is aimed to delineate groundwater potential zones evaluating hydrogeomorphic environment for future development and management in the area. The satellite image of IRS-1D (LISS III+PAN of October 2002) has been used to delineate the hydrogeomorphic units integrating ground truth data with field checks. The different hydrogeomorphic units identified using remote sensing data are dissected plateau, denudational hill, pediplain, alluvial plain and bazada. Pediplain, Alluvial plain and Bazada show good to excellent groundwater while remaining units represent very poor to moderate groundwater prospect.

Dielectric constant, dielectric loss, electrical conductivity and resistivity of Mimosoideae family trees wood samples were measured at their different physiological conditions such as fresh and oven dried. A significant variation in dielectric parameters is observed with respect to species as well as physiological conditions. This attributes to macro-structure variation in wood of Mimosoideae family trees.

Magnetospheric substorms play an important role in determining the physical state of the geomagnetotail plasma sheet. Degree of energy transactions from the magnetosphere to the ionosphere during substorms is anlaysed against changes in the conducting properties of the sheet. The diversion of cross-tail current through the auroral ionosphere is addressed in the context of conductivity variations.

This work presents the hydrochemical characterization of groundwater occurring in Balaghat town, M.P., lying between 21⁰48' and 21⁰50' N latitude and 80⁰09' and 80⁰13' E longitude. The study is based on the hydrochemical analysis and interpretation of samples collected from representative localities. The results are presented in terms of their specific use for drinking and agricultural purposes. Based on analysis certain parameters like electrical conductivity, salinity hazard, sodium percentage, sodium adsorption ratio, residual sodium carbonate, chloro-alkaline indices have been calculated. The results of hydrochemical analysis of the water samples show that all the physico-chemical constituents are within permissible limit for drinking purpose as well as irrigation purposes in the study area

Mixed-ligand organometallic complexes of Rhodium (1) and Iridium (1) with triphenyl phosphine and 2-mercapto -3-butyl - quinazoline - 4 - one have been prepared and characterised using various physico - chemical techniques. Square planar configuration for rhodium (I) and square Pyramidal structure for Iridium (I) complexes have been tentatively assigned using IR, UV - vis and PMR Spectral data.

The unsteady state flow of a visco elastic fluid of second order type over an inclined porous plate is examined, taking into account of a uniform tangential force in terms of Heaviside's unit step function which acts on the free surface for a finite interval of time with different angles of inclination of the plate and gravitational pull into consideration. The decrease in the fluid velocity during the initial length of the plate is in accordance with the natural law of absorption. When the void space is fully saturated, due to the presence of the gravitational force and partly due to the inclination of the plate the fluid velocity increases at a rapid rate only in the later part of the plate.

Varanasi (25⁰18' N and 83⁰1' E) is an ancient city situated on the left bank of river Ganga. Various physico-chemical characteristics of river Ganga flowing inVaranasi were studied in the summer, winter and rainy seasons. Ecological parameters like Dissolved Oxygen (D.O.), pH, Nitrate, Phosphate, Biochemical Oxygen Demand (B.O.D.) and Temperature were analyzed and compared with standard permissible limits to assess the best designated use of the river water for various purposes. The important sources of pollution in the river Ganges include discharge of raw sewage at different Ghats, the disposal of dead animals and human bodies, the garbage coming from household activities, discharge of faecal matters etc. Raj Ghat is the main sewage disposal point of the Varanasi city.

The physico-chemical analysis shows higher value of B.O.D. and lower value of D.O. at Raj Ghat and Assi Ghat. Ganges water was found to be rich in Nitrate and Phosphate contents, Dissolved Oxygen and Biochemical Oxygen Demand were found to be two important parameters, which showed strong correlation with several other parameters and hence can serve as good indices of river water quality.