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Shishir Priyadarshi
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Dr. Shishir Priyadarshi


Date of Birth      July 20, 1988

Nationality             Indian

Sex                       Male

Marital Status        Married

Phone: +8618263105927

Address: Center for Space Weather Science (CSW), Room no. 520, Institute of Space Sciences, Shandong University, Weihai 264209 China

Email: spriyadarshi@.sdu.edu.cn


EDUCATION


PhD (Physics  Spec. Geophysics)                                                                                                               Warsaw, Poland

Space Research Centre, Polish Academy of Science                                                                            September, 2014

Thesis Title: B-spline model of ionospheric scintillation

Academic Supervisor: Prof. Andrzej W. Wernik

Description: An empirical model for northern hemisphere -mid and -high latitude has been built. This model is based on in-situ satellite data and ground based measurements. Model uses weak scatter phase screen theory and is in good coherence with WAM (2007) model. Many embedded features of ionospheric scintillation during different geophysical condition and season have been investigated. Results are interesting and in appreciable deviation from the trend with reasonable physical explanation. Final model would be used for TRANSMIT Prototype.


Banaras Hindu University (BHU)                                                                                                      

Varanasi UP, India                                                                                                                                                      

Master of Science in Physics                                                       CGPA: 7.57/10                                            June, 2009

Specialization: Electronics and Radio Communication

Elective courses: Nano Science and Technology, Plasma Physics and Space Physics , Satellite Communication and remote Sensing, Analog Communication systems, Digital communication Systems.

Seminars: “GPS Based measurement of TEC and its variability over ground station Varanasi, India”.

 

RESEARCH EXPERIENCE


Postdoctoral Research Scientist                                                                                                  Weihai, China

Centre for Space Weather Studies (CSW), ISS, Shandong University                             June 2015 - Present   

Title: Observation and Modeling of Ionospheric Scintillation Associated with Polar Patches.

Description: We are focusing on relative GPS scintillation levels associated with the regions of enhanced plasma irregularities called auroral arcs, polar cap patches, and auroral blobs that frequently occur in the polar ionosphere. Polar cap patches are observed to exit the polar cap into the auroral oval, and were then termed auroral blobs. This may give us an unprecedented opportunity to compare the relative scintillation levels associated with these three phenomena. Using Madrigal database and South Pole Scintillation Receiver data an empirical model of ionospheric scintillation has been proposed for South Pole. Model has been validated and compared with the observations. We are investigating some interesting scintillation patterns associated with polar patches and structured flux of precipitated electrons.


Space Physicist (Postdoc)                                                                                                              Warsaw, Poland

Space Research Centre, Polish Academy of Science                                                          August 2014 – May 2015

Title: Application of the Wavelet Transform to investigate Space Plasma Turbulence

Description: The wavelet transform is used in various fields: mathematics, image compression, acoustics, fluid dynamics etc. We are using it in analyzing the space probe data, which usually are non-stationary and nonhomogeneous. These data sets often contain transient components, which are physically important. We

are working on different algorithms for the wavelet analysis of space plasma turbulence. Each algorithm will be illustrated with examples from the “real world” ionosphere.


Marie-Curie Fellow                                                                                                                                      Warsaw, Poland

Space Research Centre, Polish Academy of Science                                                                        Aug 2011-Jul 2014

Position: Early Stage Research (TRANSMIT PROJECT UNDER FP7 GRANT OF EUROPEAN COMMISSION)

Title: Physical and Empirical Model of Scintillation.

Description: Based on the available scintillation data an empirical model of scintillation has been constructed. This model is compared with other models obtained from the in-situ plasma density data, electron density profile, and utilising 1) the single phase screen model, 2) multiple phase screen model of radio propagation through the random media. The final model will be used for the prediction of scintillation with application to GNSS systems. Use of a network of GPS receivers currently recording ionospheric data in Europe and elsewhere (polar, Scandinavian and equatorial regions) for modelling of scintillations.

Webpage: http://www.nottingham.ac.uk/transmit/index.aspx



Research Internship                                                                                                                                         Banaras, India

Atmospheric Research Lab                                                                                                                   Aug 2009-Aug 2011

Position: Junior Research Fellow

Title: GPS based study of Space Weather, Seismo-Ionospheric Coupling, Ionospheric Scintillations and Plasma Bubbles.

Description: The total electron content (TEC) derived from the global positioning system (GPS) at Varanasi (latitude 25.380 N, longitude 82.9980 E), India has been measured during 2007 and 2010. We have chosen nine earthquakes (M>5) that occurred within 2000 km of Varanasi during 2007 and 2010 to study the changes in TEC associated with these earthquakes. A monthly median (MM) of the TEC and associated inter quartile range (IQR), upper bound (UB) and lower bound (LB) are utilized as a reference for identifying abnormal signals during all nine earthquakes. The results show anomalous reductions and enhancements in the TEC. These pre-earthquake ionospheric anomalies appear within 5 days prior to earthquakes. A possible mechanism responsible for ionospheric anomalies
associated with earthquakes is discussed.


Work Done:


  • ·GPS based Ionospheric Total Electron Content Measurement and its variability.
  • ·Study of Ionospheric Perturbation in Total Electron content associated with earthquakes.
  • ·Study of Ionospheric Scintillation and Plasma Bubbles using GPS data.


Master of Science Thesis                                                                                                                                Banaras, India

Banaras Hindu University                                                                                                                      Jan2008- May 2009

Title: Global Positioning System (GPS) based ionospheric Total electron content (TEC) measurement and its variability at low latitude

Description: This study describes the TEC behavior using GPS dual frequency measurement at Ground Station Varanasi (geomagnetic lat. 14 deg. 55min., long. 154 deg. E) which is situated near the equatorial ionospheric anomaly (EIA) region. We have analyzed the complete one year GPS derived TEC data from April, 2007 to March, 2008 to study the diurnal, seasonal and annual variation of TEC. We have also studied the effect solar activity as well as effect of geomagnetic activity on TEC variations. The effect of geomagnetic storm on the variation of TEC is also attempted.


Projects during Summer school in Astrophysics                                                                                             Pune, India


Inter-University Centre for Astronomy and Astrophysics                                                              May 2008- Jul 2008

Title: 1. Observation of 21cm line of Hydrogen from Our Galaxy.

Description: I did the challenging radio observations with a 3.5m radio telescope, analyzed the data myself and finally obtained the 21cm hydrogen line plots, showing the Doppler shift of the line center due to the rotation of the Milky Way spiral arms.

Title: 2. Simulation of Photon events in UVIT detectors.

Description: Here I had tried to simulate the photon events in one dimensional array for CCD’s to be used in ASTROSAT satellite.


SKILLS


Experimental

    • ·Installation and Handling of Trimble 5700 and GSV 4004V Receiver

    • ·Handling 3.5m Radio Telescope and data analysis to study Doppler Shift of HI in our Galaxy

    • ·Handling different microprocessors and their interfacing

Computer: MATLAB, FORTRAN, Lab View, Origin, Ms Office, IRAF, C/C++, LINUX and Windows OS.

Languages: English, Hindi.


ACHIEVEMENTS


  • ·CBK PAN Young Scientist Award 2014

  • ·Marie-Curie Fellow 2011-2014

  • ·Indian Association of Physics teachers (IAPT) award in 2006

  • ·Sadbhavana Club U.P. India Government Award in 2003


CONFERENCE, SEMINAR AND SUMMER SCHOOL


  • ·Oral presentation entitled “An improved physical and empirical modelling tool of ionospheric scintillation“in the 11th Edition of the European Space Weather Week during 17-21nd November 2014 in Liège, Belgium.
  • ·Oral Presentation entitled “Comparison of ionospheric scintillation models for high latitude” in the 40th  COSPAR Scientific Assembly held at Moscow Russia during 2-10 August 2014.

  • ·Oral Presentation entitled “Ionospheric Scintillation model for –high and –mid latitude Northern Hemisphere” 3rd TRANSMIT Workshop held at Torino, Italy During 18-21 February 2014.

  • ·Poster presentation entitled “Spline model of scintillation for high latitude using in situ satellite data” during AGU Fall Meeting 2013 held at San Francisco California, USA during 7-13 December 2013.

  • ·Oral presentation entitled” Spline Model for high- Latitude Ionospheric Scintillation using In Situ Data” during Tenth European Space Weather Week conference held at Anwerp Belgium during 17-22 November 2013. .

  • ·Poster presentation in Beacon Satellite Symposium between 7-13 July 2013, held at Bath, UK “Spline model of ionospheric scintillation for –mid and –high latitude”.

  • ·Participation in the TRANSMIT Summer School (1-5 July 2013, Rome, Italy).

  • ·Oral presentation entitled “Scintillation modeling and its dependence on geometry of propagation” on 9th May 2013 at Space Research Centre, Poland.

  • ·Oral presentation in 2nd TRANSMIT WORKSHOP between 12-14 February 2013, held at BATH, UK. “spline model of scintillation for –mid latitude and –high latitude”.

  • ·Attended TRANSMIT Mid Term Review meeting held at Nottingham University, UK during 13-14 December 2012.

  • ·Participation in TRANSMIT summer School entitled “Threats to different systems due to propagating ionization fronts and irregularities in the ionosphere” during 10-14 August 2012, held at Neustrelitz Germany.

  • ·Poster presentation entitled “Physical and empirical models of ionospheric scintillation” at Marie-Curie ESOF 2012 conference in Dublin, Ireland, during 10-15 July 2012.

  • ·Polish-Russian School for Young Scientists “Space Physics and Space Weather”, 14-16 May 2012, Warsaw, Poland.

  • ·6th GNSS Vulnerabilities and Solutions Conference, Baska, Croatia, 21-24 May 2012

  • ·“Summer School in Space Science and Technology”, SRC, Poland, 17-20 July, 2012.

  • ·Oral presentation entitled “Variation in scintillation index with zenith angle and azimuth” at the  6th GNSS Vulnerabilities and Solutions Conference”, Baska, Croatia, during 21-24 May 2012.

  • ·Seminar talk entitled “The Ionospheric Perturbations triggered due to earthquake” at SRC, Warsaw, Poland was presented on November 3, 2011.

  • ·Participation in the 1st TRANSMIT Summer School, “Underlying causes of iono-spheric effects on radio wave propagation”, 19 – 23 September 2011 Konstancin-Jeziorna by Warsaw,

  • ·Oral presentation entitled “Study of ionospheric scintillation using GPS data” at NSSS 2010 India.

  • ·Poster presentation entitled “Studies of Plasma bubbles and comparisons of TEC fluctuation with scintillation at Varanasi    using GPS data” at COSPAR 2010 Berman Germany.

  • ·Poster presentation at “The Variation of GPS derived TEC during low solar active period (May 2007- April 2009) in   Indian   region” at IAGA 2009 Hungary. 

  •  ·Oral presentation entitled “Ionospheric perturbation in Total Electron Content (TEC) associated with some major earthquakes” at PLASMA 2009 India.

  • ·Poster presentation entitled “GPS detection of ionospheric perturbations before some major earthquakes” at AOGS 2010 India.


PUBLICATIONS



  • ·Priyadarshi, S., (2015). Ionospheric Scintillation Modelling for –High and -Mid Latitude Using B-spline Technique, Astrophys Space Sci. 359:12, DOI 10.1007/s10509-015-2461-x.
  • ·Priyadarshi, S., (2015). A Review of Ionospheric Scintillation Models, Surveys in Geophysics: Volume 36, Issue 2, Page 295-324.

  • ·Priyadarshi, S., Wernik, A.W., (2014). B-spline model of ionospheric scintillation for –high latitude using in-situ satellite data, Book Chapter 10: Mitigation of Ionospheric Threats to GNSS: an Appraisal of the scientific and technological outputs of the TRANSMIT project, ISBN 978-953-51-1642-4, Published: July 17, 2014 under CC BY 3.0 license http://dx.doi.org/10.5772/58777.

  • ·Priyadarshi, S., Wernik, A.W., (2013). Variation of the Ionospheric Scintillation Index with Elevation Angle of the Transmitter. Acta Geophysica DOI: 10.2478/s11600-013-0123-3.
  • ·Priyadarshi, S., Wernik, A.W., (2013). Variation in the ionospheric scintillation index with elevation angle. 6th GNSS Vulnerabilities and Solutions Conference.  
  • ·Priyadarshi, S., (2012). Review of Existing Scintillation Models; TRANSMIT NEWSLETTER, November, Issue 1.

  • ·Kumar, S., Priyadarshi, S., Gopi Krishna, S., Singh, A. K. (2012). GPS-TEC variations during low solar activity period (2007–2009) at Indian low latitude stations. Astrophys Space Sci DOI 10.1007/s10509-011-0973-6.

     

  • ·Priyadarshi, S. Kumar, S.and Singh, A. K. (2011b), Ionospheric perturbations associated with two recent major earthquakes (M>5.0). PhysicaeScripta, 84, 045901, doi:10.1088/0031-8949/84/04/045901.

     

  • ·Priyadarshi, S., Kumar, S. and Singh, A. K. (2011a), Changes in total electron content associated with earthquakes (M > 5) observed from GPS station, Varanasi, India. Journal of Geomantic Natural Hazards and Risk, 2 (2), 123.


 
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