1. Positive and negative discharges: electric and magnetic field variation Presenter: Hripsime Mkrtchyan Supervisor: Ashot Chilingarian

2. Instrumentation, their locations Instrumentation, their locations Joint measurements Joint measurements Negative and positive discharges, their differences Negative and positive discharges, their differences Magnetic field during discharges Magnetic field during discharges Overview

3. Vantage Pro2 Boltek EFM-100 Lightning Detector (Boltek) Outside 3 &1 cm plastic scintillator detectors Step changes in Field magnitude indicate lightning Lemi-417

4. Locations of Boltek EFM-100 electric field mills

5. The Top Of Mount Aragats Yeravan The Lake of Aragats Geovision gv- bx1500 All Sky Cam 180° Mount Ararat The Geographical locations of The Aragats Cameras The count of the cameras: 3 Framerate: Up to 30fps The installed height: 3200m. LINKSYS LCAD03VLNOD 1080p 3MP

8. Joint measurements on May 23

11. More then 486 discharge events were registered during this day from which 321 were positive and 165 negative discharges.

12. Positive and Negative discharges

13. Some Interesting Pictures At Byurakan During 2015.05.23

18. positive once 0.05 to 0.55 second, and for negative ones 0.1-0.99 Histogram of the time from the start of the electric-field sharp decrease (enhancement ) till its minimum (maximum) positive once 0.05 to 0.55 second, and for negative ones 0.1-0.99

19. Histogram of the Amplitude of the electric-field sharp changes: a) for positive and b) for negative

21. For Electric field (E):

22. Slope and Constant distribution histograms for 139 negative discharges.

23. Correlation between slope and constant of power fit function for selected 25 events.

25. Correlation between discharge amplitude and Speed of decay (for first 60 data) with R = 0.87

26. Magnetic field

27. Magnetic field’s jumps

28. By Aragats measurements Date/TimeB_xB_yB_z By components Electric field 13:42:49-16.3-3.692.116.84-32 13:41:20-3.7-0.9424.31-41 14:00:02-0.6-0.611.21.47-3.3 15:20:47-0.4-0.120.40.5815.8 15:45:030.4-2.032.73.4046.6 16:17:260.60.690.41.004 15:35:270.6-0.830.91.3637 16:41:180.81.72-1.12.192.85 14:13:261.72.61-1.93.6513.8 14:05:141.8-6.6169.11-51.2 13:46:192.2-1.811.63.27-33.7 13:45:122.30.41-0.82.47-23.7 13:46:0531.6-0.73.47-4.1 17:29:36613.658.817.31-6.4 17:22:3313-3.76-3.213.91-10.5 17:05:0014.211.7-820.06-5.45 17:11:3015.910.83-6.720.37-14.25 17:37:53186.34-8.720.97-18.2 type + + + - - - - - - + + + + + + + + + Date/TimeB_xB_yB_z By components Electric field 13:42:49-16.3-3.692.116.84-32 13:41:20-3.7-0.9424.31-41 14:00:02-0.6-0.611.21.47-3.3 15:20:47-0.4-0.120.40.5815.8 15:45:030.4-2.032.73.4046.6 16:17:260.60.690.41.004 15:35:270.6-0.830.91.3637 16:41:180.81.72-1.12.192.85 14:13:261.72.61-1.93.6513.8 14:05:141.8-6.6169.11-51.2 13:46:192.2-1.811.63.27-33.7 13:45:122.30.41-0.82.47-23.7 13:46:0531.6-0.73.47-4.1 17:29:36613.658.817.31-6.4 17:22:3313-3.76-3.213.91-10.5 17:05:0014.211.7-820.06-5.45 17:11:3015.910.83-6.720.37-14.25 17:37:53186.34-8.720.97-18.2

29. By Nor Amberd measurements Date/TimeB_xB_yB_z By components Electric field type 17:11:30-5.416.59-7.919.1531.7+ 15:20:47-2.7-0.18-0.22.7156.2- 15:11:18-2.5-3.07-1.24.1419.5-(cg) 17:05:00-213.72-4.714.6486- 16:14:34-1.9-5.011.85.6522.7-(cg) 16:49:17-1.80.781.52.4764.6- 16:25:52-1.1-0.730.31.3528.45-(ic) 16:54:00-6.17-0.76.2961- 16:17:26-0.92.82-0.93.094.4- 15:17:36-0.3-0.2900.4213.4- 16:30:260.3-0.080.20.3752.3- 15:35:270.6-1.020.81.4357.6- 16:33:501.2-0.59-0.41.4026.3- 17:29:365.517.08-16.624.4447.05+ 17:46:108.115.1215.923.3954.2+ 17:22:3313.3-0.655.214.3050.8+ 17:37:5329.422.96-6.437.8544.35+ Date/TimeB_xB_yB_z By components Electric field type 17:11:30-5.416.59-7.919.1531.7+ 15:20:47-2.7-0.18-0.22.7156.2- 15:11:18-2.5-3.07-1.24.1419.5-(cg) 17:05:00-213.72-4.714.6486- 16:14:34-1.9-5.011.85.6522.7-(cg) 16:49:17-1.80.781.52.4764.6- 16:25:52-1.1-0.730.31.3528.45-(ic) 16:54:00-6.17-0.76.2961- 16:17:26-0.92.82-0.93.094.4- 15:17:36-0.3-0.2900.4213.4- 16:30:260.3-0.080.20.3752.3- 15:35:270.6-1.020.81.4357.6- 16:33:501.2-0.59-0.41.4026.3- 17:29:365.517.08-16.624.4447.05+ 17:46:108.115.1215.923.3954.2+ 17:22:3313.3-0.655.214.3050.8+ 17:37:5329.422.96-6.437.8544.35+

31. 1.73*0.0001

32. Aim of my work 1.Lower positive charge region (LPCR) and its initiation. 2.Nature of electric discharges during Thunderstorm Ground Enhancements (TGEs) 3.Data comparison between Boltek stations and WWLLN 4.Meteorological parameters behavior during TGEs 5.Thunderclouds investigation using RADAR from Ashtarak

33. Summary Negative discharges are longer then positive one. Positives’ amplitudes are larger. Negative discharge generate smaller changes in magnetic field Positive lightning generate strong magnetic field variation then negative one

39. Thank you for forquestionsandcomments