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Sharma, A. K.

Development of Fast Image Analysis Technique for All-Sky Images

Abstract Views :247 | PDF Views:92

Authors

A. K. Sharma ¹, D. P. Nade ¹, S. S. Nikte ¹, R. N. Ghodpage ², P. T. Patil ², M. V. Rokade ¹, R. S. Vhatkar ¹, S. Gurubaran ³

Affiliations
1 Earth and Space Science Laboratory, Department of Physics, Shivaji University, Kolhapur 416 004, IN
2 Medium Frequency Radar, Indian Institute of Geomagnetism, Shivaji University Campus, Kolhapur 416 004, IN
3 Indian Institute of Geomagnetism, New Panvel, Navi Mumbai 410 218, IN

Source

Current Science, Vol 106, No 8 (2014), Pagination: 1085-1093

Abstract

This article describes the possibility of using the fast image analysis technique for qualitative and quantitative analysis of equatorial plasma bubble obtained using All-Sky imager (ASI) data. Automated image processing (generally) is useful for identification of equatorial plasma bubbles (EPBs) and its parameters. We have developed a fast (and efficient) analysis technique essential to study the data of images. The present work reports the results of a statistical study of the zonal plasma bubble velocities using nightglow OI 630.0 nm emission data, acquired by ASI (FOV 140°) at the low-latitude station Kolhapur (16.42°N, 74.2°E and 10.6°N dip lat.). Based on the observations of 15 nights made in January 2012, we have determined the velocity of EPB using our new method. The daily mean values of the EPB velocity match well with those of the earlier studies made at Kolhapur. We have found that, generally, the mean zonal drift velocities of the plasma bubbles tend to decrease with local time (after midnight). The most significant finding from this work is that the calculated velocities of plasma bubble using fast and scanning methods are nearly equal.

Keywords

All-Sky Imager, Equatorial Plasma Bubble, Nightglow Emissions, Zonal Drift Velocity.

Full Text

On the Vertical Wavelength Estimates Using the Krassovsky Parameters of OH Airglow Monitoring

Abstract Views :235 | PDF Views:81

Authors

R. N. Ghodpage ¹, A. Taori ², P. T. Patil ¹, Devendraa Siingh ³, S. Gurubaran ⁴, A. K. Sharma ⁵

Affiliations
1 Medium Frequency Radar, Indian Institute of Geomagnetism, Shivaji University Campus, Kolhapur 416 004, IN
2 Atmospheric Research Laboratory, Gadanki 517 112, IN
3 Indian Institute of Tropical Meteorology, Pune 411 008, IN
4 Indian Institute of Geomagnetism, Navi Mumbai 410 218, IN
5 Department of Physics, Shivaji University, Kolhapur 416 004, IN

Source

Current Science, Vol 108, No 7 (2015), Pagination: 1362-1369

Abstract

The photometric measurements of mesospheric OH and O(¹S) emission, carried out from Kolhapur (16.8°N, 74.2°E), Maharashtra during January-April 2005 are used to study the wave characteristics. The nocturnal variability reveals the dominant long-period wave signatures with significant amplitudes of embedded short-period waves. We carry out a sensitivity study on the vertical wavelength (VW) derived with the help of Krassovsky parameters (η = |η|e^iΦ) of the OH data, which reveals VW to vary from 38.9 to 110.2 km. This was compared with the VW estimates using the phase difference of the simultaneously observed waves in both OH and O(¹S) emission intensities. Results reveal that in the absence of attitudinally resolved measurements, the VW estimated using Krassovsky method can be used.

Keywords

Airglow, Atmospheric Gravity Waves, Lower Thermosphere, Mesosphere, Vertical Wavelength.

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Incessant Erosion of High Tidal Mudflats in the Northern Gulf of Khambhat

Abstract Views :193 | PDF Views:90

Authors

Hiren Bhatti ¹, Ratheesh Ramakrishnan ¹, A. K. Sharma ¹, A. S. Rajawat ¹

Affiliations
1 Space Applications Centre, Jodhpur Tekra, Ahmedabad 380 015, IN

Source

Current Science, Vol 114, No 12 (2018), Pagination: 2554-2558

Abstract

Extensive erosion of high tidal mudflat along the northern parts of Gulf of Khambhat (GoK) was observed from the analysis of time series satellite images during the time period from March 2014 to September 2017. Around 28.66 sq. km area of high tidal mudflat eroded within this time period. Maximum erosion rates estimated have even peaked to about 4 km/year showing the severity of erosion. The mudflats under erosion are along the outer boundary of a meandering tidal channel connecting the Gulf with Mahi river. A possible cause of the incessant erosion of mudflats is the strong tidal currents along the outer boundary of the meandering tidal channel, that have carved the mudflats and pushed the tidal channel further landward. A subtle seasonal pattern of erosion was observed with decrease in erosion rates during the summer monsoon period when the high tidal currents are weak due to the river influx. Rapid erosion of the tidal mudflats has not only destroyed the vital habitat, but has also eventually exposed the inhabited land area to tidal flooding, making it vulnerable to erosion. The study shows the importance of assessing the stability of mudflats along the GoK, where large development activities are proposed.

Keywords

DSAS, Erosion, High Tidal Mudflat, Satellite Data, Tidal Channel.

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References

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Efficacy of Ascorbic Acid Treatments in the Production of Green Raisins

Abstract Views :276 | PDF Views:87

Authors

Prerna Nath ¹, S. J. Kale ¹, A. K. Sharma ²

Affiliations
1 HCP Division, ICAR-Central Institute of Post-Harvest Engineering and Technology, Abohar 152 116, IN
2 ICAR-National Research Centre for Grapes, Pune 412 307, IN

Source

Current Science, Vol 116, No 6 (2019), Pagination: 943-951

Abstract

The quality of raisins is mainly perceived by their colour. Green-coloured raisins are considered as the best quality raisins whereas brown/dark-coloured raisins possess poor quality. Raisin colour is affected by different factors like grape variety, pre-treatments to grape berries, drying method, drying conditions, etc. The present study was conducted to produce greencoloured raisins through two different treatments of ascorbic acid – dipping and spraying. These treatments were applied to Thompson Seedless grapes independently with different doses (100–500 ppm) of ascorbic acid. Results indicated that lesser darkening of raisins was observed when ascorbic acid was sprayed on bunches during drying than the dipping treatment. In all the samples, polyphenol oxidase (PPO) activity decreased with drying duration. Lower PPO content was noted in dipped and sprayed grapes than control. However, application of ascorbic acid influenced the other parameters. The present study revealed that ascorbic acid spray is suitable for retaining green colour in raisins with faster drying. Overall, 200 ppm ascorbic acid spray was found appropriate in the production of green raisins.

Keywords

Ascorbic Acid, Dipping and Spraying, Green Raisins, Polyphenol Oxidase.

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References

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Adsule, P. G., Sharma, A. K., Banerjee, K. and Karibasappa, G. S., Raisin industry in India: adoption of good drying practices for safe raisins, Bulletin de 1’OIV 85 (n°974-975-976), 2012, 209– 216.

Sharma, A. K., Rajguru, Y. R., Adsule, P. G. and Goswami, A. K., Pre-treatments of Tas-A-Ganesh grape bunches and subsequent effect on their drying. Indian J. Hortic., 2013, 70(1), 107–111.

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Sikora, M. and Swieca, M., Effect of ascorbic acid postharvest treatment on enzymatic browning, phenolics and antioxidant capacity of stored mung bean sprouts. Food Chem., 2018, 239, 1160–1166.

Aguayo, E., Requejo-Jackman, C., Stanley, R. and Woolf, A., Hot water treatment in combination with calcium ascorbate dips increases bioactive compounds and helps to maintain fresh-cut apple quality. Postharvest Biol. Technol., 2015, 110, 158–165.

Hussain, P. R., Omeera, A., Suradkar, P. P. and Dar, M. A., Effect of combination treatment of gamma irradiation and ascorbic acid on physicochemical and microbial quality of minimally processed eggplant (Solanum melongena L.). Radiat. Phys. Chem., 2014, 103, 131–141.

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Potential of Airborne Hyperspectral Data for Geo-Exploration over Parts of Different Geological/Metallogenic Provinces in India based on AVIRIS-NG Observations

Abstract Views :208 | PDF Views:112

Authors

Satadru Bhattacharya ¹, Hrishikesh Kumar ¹, Arindam Guha ², Aditya K. Dagar ¹, Sumit Pathak ¹, Komal Rani (Pasricha) ², S. Mondal ³, K. Vinod Kumar ², William Farrand ⁴, Snehamoy Chatterjee ⁵, S. Ravi ⁶, A. K. Sharma ¹, A. S. Rajawat ¹

Affiliations
1 Space Applications Centre, Indian Space Research Organisation, Ahmedabad 380 015, IN
2 National Remote Sensing Centre, Indian Space Research Organisation, Hyderabad 500 042, IN
3 Department of Geophysics, Indian Institute of Technology (ISM), Dhanbad 826 004, IN
4 Space Science Institute, Boulder, Colorado 80301, US
5 Department of Geological and Mining Engineering and Sciences, Michigan Technological University, Houghton, Michigan 49931, US
6 Geological Survey of India Training Institute, Bandlaguda, Hyderabad 500 068, US

Source

Current Science, Vol 116, No 7 (2019), Pagination: 1143-1156

Abstract

In this article, we discuss the potential of airborne hyperspectral data in mapping host rocks of mineral deposits and surface signatures of mineralization using AVIRIS-NG data of a few important geological provinces in India. We present the initial results from the study sites covering parts of northwest India, as well as the Sittampundi Layered Complex (SLC) of Tamil Nadu and the Wajrakarur Kimberlite Field (WKF) of Andhra Pradesh from southern India. Modified spectral summary parameters, originally designed for MRO-CRISM data analysis, have been implemented on AVIRIS-NG mosaic of Jahazpur, Rajasthan for the automatic detection of phyllosilicates, carbonates and Fe–Mg-silicates. Spectral analysis over Ambaji and the surrounding areas indicates the presence of calcite across much of the study area with kaolinite occurring as well in the north and east of the study area. The deepest absorption features at around 2.20 and 2.32 μm and integrated band depth were used to identify and map the spatial distribution of phyllosilicates and carbonates. Suitable thresholds of band depths were applied to map prospective zones for marble exploration. The data over SLC showed potential of AVIRIS-NG hyperspectral data in detecting mafic cumulates and chromitites. We also have demonstrated the potential of AVIRIS-NG data in detecting kimberlite pipe exposures in parts of WKF.

Keywords

Data, Geological Provinces, Host Rocks, Hyperspectral, Mineral Deposits.

Full Text

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