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Kumar, Prashant

Humidity Profile Retrieval from SAPHIR On-Board the Megha-Tropiques

Abstract Views :234 | PDF Views:93

Authors

A. K. Mathur ¹, R. K. Gangwar ¹, B. S. Gohil ¹, Sanjib K. Deb ¹, Prashant Kumar ¹, Munn V. Shukla ¹, B. Simon ¹, P. K. Pal ¹

Affiliations
1 Atmosphere and Oceanic Sciences Group (EPSA), Space Applications Centre (ISRO), Ahmedabad 380 015, IN

Source

Current Science, Vol 104, No 12 (2013), Pagination: 1650-1655

Abstract

The Megha-Tropiques (MT) satellite, a joint Indo- French mission, was launched by ISRO's PSLV-C18 on 12 October 2011 from Sriharikota, India. SAPHIR, a microwave humidity sounder on-board Megha Tropiques operates in six channels with frequencies around 183.31 GHz. A radiative transfer simulationbased operational algorithm has been developed to retrieve layer-averaged relative-humidity (LARH) for six atmospheric layers from the surface to nearly 12 km using SAPHIR observations over land and ocean under non-rainy conditions. SAPHIR-derived LARH for the period July to November 2012 has been validated with concurrent quality-controlled radiosonde observations as well as with ECMWF analysis data. Global validation with radiosonde and ECMWF data shows that ischolar_main mean square deviation in LARH for all the six layers is nearly 20% and 15% respectively, after bias correction.

Keywords

Atmospheric Layers, Humidity Sounder, Radiosonde Observations, Relative Humidity.

Full Text

Probing the Heliosphere Using in Situ Payloads On-Board Aditya-L1

Abstract Views :208 | PDF Views:80

Authors

P. Janardhan ¹, Santosh Vadawale ¹, Bhas Bapat ², K. P. Subramanian ¹, D. Chakrabarty ¹, Prashant Kumar ¹, Aveek Sarkar ¹, Nandita Srivastava ¹, R. Satheesh Thampi ³, Vipin K. Yadav ³, M. B. Dhanya ³, Govind G. Nampoothiri ³, J. K. Abhishek ³, Anil Bhardwaj ¹, K. Subhalakshmi ⁴

Affiliations
1 Physical Research Laboratory, Ahmedabad 380 009, IN
2 Indian Institute of Science Education and Research, Pashan, Pune 411 008, IN
3 Space Physics Laboratory, Vikram Sarabhai Space Centre, Thiruvananthapuram 695 022, IN
4 Laboratory for Electro-Optics Systems, ISRO, Bengaluru 560 058, IN

Source

Current Science, Vol 113, No 04 (2017), Pagination: 620-624

Abstract

Aditya-L1, the first ever Indian scientific space mission dedicated to probe the Sun, our nearest star, is slated for launch by the Indian Space Research Organisation (ISRO) most likely in 2020, the year coinciding with the expected start of the rising phase of solar cycle 25. Of the seven science payloads on-board Aditya-L1, three are in situ instruments, namely the Aditya Solar wind Particle Experiment, the Plasma Analyser Package for Aditya and a magnetometer package. These three payloads will sample heliospheric data from the L1 Lagrangian point of the Sun-Earth system, at a distance of ~1% of the distance to the Sun, along the Sun-Earth line. This is therefore a unique opportunity for the solar physics community to gain a better understanding of the inner heliosphere and predict space weather more accurately.

Keywords

Aditya-L1, Heliosphere, Payload, Solar Wind Plasma.

Full Text

References

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SCATSAT-1 Wind Products for Tropical Cyclone Monitoring, Prediction and Surface Wind Structure Analysis

Abstract Views :295 | PDF Views:70

Authors

Neeru Jaiswal ¹, Prashant Kumar ¹, C. M. Kishtawal ¹

Affiliations
1 Atmospheric Sciences Division, Atmospheric and Oceanic Sciences Group, Earth, Ocean, Atmosphere, Planetary Sciences and Applications Area, Space Applications Centre (ISRO), Ahmedabad 380 015, IN

Source

Current Science, Vol 117, No 6 (2019), Pagination: 983-992

Abstract

The present study discusses the application of near real-time ocean surface wind vectors retrieved from scatterometer instrument, on-board Indian polar satellite SCATSAT-1, for tropical cyclone (TC) analysis and prediction. The real-time tropical cyclogenesis prediction of cyclonic activities in the North Indian Ocean basin has been presented using SCATSAT-1 wind data. The study also demonstrates the utility of high-resolution surface wind products of the scatterometer in monitoring mesoscale-level features of TCs for centre determination, size estimation and analysis of asymmetric wind radii. Impact of SCATSAT-1 winds for TC prediction using numerical weather prediction model has also been discussed. The shortcomings of ocean surface wind observations from space-based scatterometers are addressed, in addition to the sensor requirements for future satellite missions.

Keywords

Cyclogenesis, Scatterometer, Tropical Cyclone, Wind Structure.

Full Text

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