Positive and negative discharges electric and magnetic field

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

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

Vantage Pro 2 Lemi-417 Step changes in Field magnitude indicate lightning Lightning Detector (Boltek) Boltek EFM-100 Outside 3 &1 cm plastic scintillator detectors

The Geographical locations of The Aragats Cameras Mount Ararat Yeravan All Sky Cam 180° Geovision gvbx 1500 LINKSYS The Lake of Aragats The Top Of Mount Aragats The count of the cameras: 3 Framerate: Up to 30 fps The installed height: 3200 m. LCAD 03 VLNOD 1080 p 3 MP

Joint measurements on May 23

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

Positive and Negative discharges

Some Interesting Pictures At Byurakan During 2015. 05. 23

Some Interesting Pictures At Byurakan During 2015. 05. 23

Some Interesting Pictures At Byurakan During 2015. 05. 23

Some Interesting Pictures At Byurakan During 2015. 05. 23

Some Interesting Pictures At Byurakan During 2015. 05. 23

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

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

For Electric field (E):

Slope and Constant distribution histograms for 139 negative discharges.

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

Correlation between discharge amplitude and Speed of decay (for first 60 data) with R = 0. 87

Magnetic field

Magnetic field’s jumps

By Aragats measurements Date/Time B_x B_y B_z By components Electric field type 13: 42: 49 -16. 3 -3. 69 2. 1 16. 84 -32 + 13: 41: 20 -3. 7 -0. 94 2 4. 31 -41 + 14: 00: 02 -0. 61 1. 2 1. 47 -3. 3 + 15: 20: 47 -0. 4 -0. 12 0. 4 0. 58 15. 8 - 15: 45: 03 0. 4 -2. 03 2. 7 3. 40 46. 6 - 16: 17: 26 0. 69 0. 4 1. 00 4 - 15: 35: 27 0. 6 -0. 83 0. 9 1. 36 37 - 16: 41: 18 0. 8 1. 72 -1. 1 2. 19 2. 85 - 14: 13: 26 1. 7 2. 61 -1. 9 3. 65 13. 8 - 14: 05: 14 1. 8 -6. 61 6 9. 11 -51. 2 + 13: 46: 19 2. 2 -1. 81 1. 6 3. 27 -33. 7 + 13: 45: 12 2. 3 0. 41 -0. 8 2. 47 -23. 7 + 13: 46: 05 3 1. 6 -0. 7 3. 47 -4. 1 + 17: 29: 36 6 13. 65 8. 8 17. 31 -6. 4 + 17: 22: 33 13 -3. 76 -3. 2 13. 91 -10. 5 + 17: 05: 00 14. 2 11. 7 -8 20. 06 -5. 45 + 17: 11: 30 15. 9 10. 83 -6. 7 20. 37 -14. 25 + 17: 37: 53 18 6. 34 -8. 7 20. 97 -18. 2 +

By Nor Amberd measurements Date/Time B_x B_y B_z By components Electric field type 17: 11: 30 -5. 4 16. 59 -7. 9 19. 15 31. 7 + 15: 20: 47 -2. 7 -0. 18 -0. 2 2. 71 56. 2 - 15: 11: 18 -2. 5 -3. 07 -1. 2 4. 14 19. 5 -(cg) 17: 05: 00 -2 13. 72 -4. 7 14. 64 86 - 16: 14: 34 -1. 9 -5. 01 1. 8 5. 65 22. 7 -(cg) 16: 49: 17 -1. 8 0. 78 1. 5 2. 47 64. 6 - 16: 25: 52 -1. 1 -0. 73 0. 3 1. 35 28. 45 -(ic) 16: 54: 00 -1 -6. 17 -0. 7 6. 29 61 - 16: 17: 26 -0. 9 2. 82 -0. 9 3. 09 4. 4 - 15: 17: 36 -0. 3 -0. 29 0 0. 42 13. 4 - 16: 30: 26 0. 3 -0. 08 0. 2 0. 37 52. 3 - 15: 35: 27 0. 6 -1. 02 0. 8 1. 43 57. 6 - 16: 33: 50 1. 2 -0. 59 -0. 4 1. 40 26. 3 - 17: 29: 36 5. 5 17. 08 -16. 6 24. 44 47. 05 + 17: 46: 10 8. 1 15. 12 15. 9 23. 39 54. 2 + 17: 22: 33 13. 3 -0. 65 5. 2 14. 30 50. 8 + 17: 37: 53 29. 4 22. 96 -6. 4 37. 85 44. 35 +

1. 73*0. 0001

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

Thank you for questions and comments