Positive and negative discharges: electric and magnetic field variation

Presenter: Hripsime MkrtchyanSupervisor: Ashot Chilingarian

• Instrumentation, their locationsInstrumentation, their locations• Joint measurementsJoint measurements• Negative and positive discharges , their differencesNegative and positive discharges , their differences• Magnetic field during dischargesMagnetic field during discharges

Overview

Vantage Pro2

Boltek EFM-100

Lightning Detector(Boltek)

Outside 3 &1 cm plastic scintillator detectors

Step changes in Field magnitude indicate lightning

Lemi-417

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: 3Framerate: Up to 30fpsThe installed height: 3200m.

LINKSYS LCAD03VLNOD 1080p

3MP

Joint measurements on May 23Joint measurements on May 23

More then 486 discharge events were registered More then 486 discharge events were registered during this day from which 321 were positive during this day from which 321 were positive

and 165 negative discharges.and 165 negative discharges.

Positive and Negative dischargesPositive 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 0.1-0.99positive 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):For Electric field (E):

Slope and Constant distribution Slope and Constant distribution histograms for 139 negative histograms for 139 negative

discharges. discharges.

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

Correlation between discharge amplitude and Speed of decay

(for first 60 data)  with  R = 0.87

Magnetic fieldMagnetic field

Magnetic field’s jumpsMagnetic field’s jumps

By Aragats measurementsBy Aragats measurements

Date/Time B_x B_y B_z By components Electric field

13:42:49 -16.3 -3.69 2.1 16.84 -3213:41:20 -3.7 -0.94 2 4.31 -41

14:00:02 -0.6 -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 46.616:17:26 0.6 0.69 0.4 1.00 415:35:27 0.6 -0.83 0.9 1.36 3716:41:18 0.8 1.72 -1.1 2.19 2.8514:13:26 1.7 2.61 -1.9 3.65 13.814:05:14 1.8 -6.61 6 9.11 -51.213:46:19 2.2 -1.81 1.6 3.27 -33.713:45:12 2.3 0.41 -0.8 2.47 -23.713:46:05 3 1.6 -0.7 3.47 -4.117:29:36 6 13.65 8.8 17.31 -6.417:22:33 13 -3.76 -3.2 13.91 -10.517:05:00 14.2 11.7 -8 20.06 -5.4517:11:30 15.9 10.83 -6.7 20.37 -14.25

17:37:53 18 6.34 -8.7 20.97 -18.2

type

++

+

-

-----++++++++

+

Date/Time B_x B_y B_z By components Electric field

13:42:49 -16.3 -3.69 2.1 16.84 -3213:41:20 -3.7 -0.94 2 4.31 -41

14:00:02 -0.6 -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 46.616:17:26 0.6 0.69 0.4 1.00 415:35:27 0.6 -0.83 0.9 1.36 3716:41:18 0.8 1.72 -1.1 2.19 2.8514:13:26 1.7 2.61 -1.9 3.65 13.814:05:14 1.8 -6.61 6 9.11 -51.213:46:19 2.2 -1.81 1.6 3.27 -33.713:45:12 2.3 0.41 -0.8 2.47 -23.713:46:05 3 1.6 -0.7 3.47 -4.117:29:36 6 13.65 8.8 17.31 -6.417:22:33 13 -3.76 -3.2 13.91 -10.517:05:00 14.2 11.7 -8 20.06 -5.4517:11:30 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 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 +

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 -

15:17:3615:17:36 -0.3-0.3 -0.29-0.29 00 0.420.42 13.413.4 --

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

SummarySummary

• 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 youThank you for for

questions questions and and

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