Ningyu Liu, Joseph R.Dwyer, Hamid K.Rassoul

Corona discharges from thundercloud hydrometeors (i.e., water droplets and iceparticles) are an important component in thunder-storm charging and discharging processes (e.g., Loeb,1965; MacGorman and Rust,1998; Rakov andUman,2003). Many studies

have been conducted to investigate the onset condition and the characteristics of corona discharges from water drops and ice particles.

19 September, 2009

60940

60960

60980

61000

61020

61040

61060

61080

21:07:12 21:36:00 22:04:48 22:33:36 23:02:24 23:31:12 0:00:00

UT

Pres

sure

39500

40000

40500

41000

41500

42000

42500

Coun

t rate

Aragats pressure ArNM

4 October, 2010

61360

61370

61380

61390

61400

61410

61420

61430

61440

16:19:12 16:48:00 17:16:48 17:45:36 18:14:24 18:43:12 19:12:00

UT

Pres

sure

37000

37500

38000

38500

39000

39500

40000

40500

41000

Coun

t rate

Aragats Pressure ArNM

21 May, 2009

61450

61500

61550

61600

61650

61700

61750

15:00 15:28 15:57 16:26 16:55 17:24 17:52 18:21

UT

Pres

sure

38500

39000

39500

40000

40500

41000

41500

Coun

t rate

of ne

utron

s

Aragats pressure (impuls) ArNM

3 June, 2009

61480

61490

61500

61510

61520

61530

61540

61550

61560

61570

14:24 14:52 15:21 15:50 16:19 16:48 17:16 17:45 18:14

UT

Pres

sure

(in im

puls)

-4

-2

0

2

4

6

8

10

Coun

t rate

(%)

Aragats Pressure SAragats Sevan(100)

7 0ctober, 2012

-3-2-10123456789

101112

13:37 14:06 14:35 15:04 15:33 16:01 16:30

UT

Coun

t rate

(%) a

nd Sp

eed

of W

ind

696.6

696.7

696.8

696.9

697

697.1

697.2

697.3

697.4

Pres

sure

(mb)

Cube middle Aragats speed of wind Aragats pressure

8 October, 2012

-25

-20

-15

-10

-5

0

5

10

15

20

25

30

16:19 16:33 16:48 17:02 17:16 17:31 17:45 18:00 18:14

UT

EF, C

ount

rate(%

) and

Sp

eed

690.5

691

691.5

692

692.5

693

693.5

Pres

sure

Aragats, Electric Field Cube with veto Speed of wind Pressure

Enhancement and deficit of Muon > 5 GeV during thunderclouds?

4 October, 2010

-40

-30

-20

-10

0

10

20

30

40

18:07 18:14 18:21 18:28 18:36

UT

Ele

ctri

c fi

eld

-25

-20

-15

-10

-5

0

5

10

15

20

25

Co

un

t ra

te o

f m

uo

ns

(%)

Aragats Ef Ar muons>5GeV

4 October, 2010

-40

-30

-20

-10

0

10

20

30

40

50

17:28 17:42 17:57 18:11 18:25 18:40

Co

un

t ra

te (

%)

AMMM(outside)7MeV muons > 5 gev

3 June, 2009

-2

0

2

4

6

8

10

12

15:50 15:57 16:04 16:12 16:19 16:26 16:33 16:40 16:48

muon>5GeV >10MeV

9 May, 2011

-2.00

-1.00

0.00

1.00

2.00

3.00

4.00

5.00

8:52 9:07 9:21 9:36 9:50 10:04 10:19 10:33

Coun

t rat

e (%

)

Outside detector Muons>5 GeV

27 May, 2011

-2

0

2

4

6

8

10

12

14

16

18

20

12:00 12:28 12:57 13:26 13:55 14:24

UT

Co

un

t ra

te (

%)

AMMM(outside)>7 MeV AMMM(muons > 5 GeV)

26 August, 2010

-3.00

-2.00

-1.00

0.00

1.00

2.00

3.00

4.00

5.00

9:21 9:50 10:19 10:48 11:16 11:45

UT

Co

un

t ra

te (

%)

AMMM(outside) AMMM(muons>5GeV)

19 April, 2012

-40

-30

-20

-10

0

10

20

30

40

50

12:43:12 12:50:24 12:57:36 13:04:48 13:12:00 13:19:12 13:26:24 13:33:36

UT

Va

lue

of

Ele

ctr

ic F

ield

-1.5

-1

-0.5

0

0.5

1

1.5

2

Co

un

t ra

te o

f T

GE

pa

rtic

les

Nor Amberd`s Boltek NAMMM(1,0)

8 January, 2013

-20

-15

-10

-5

0

5

10

15

20

25

30

35

40

1:38 1:40 1:41 1:43 1:44 1:45 1:47 1:48

UT

Ele

ctri

c fi

eld

-10

-8

-6

-4

-2

0

2

4

6

8

10

Co

un

t ra

te (

%)

Aragats EF Ar SEVAN(100) Ar Sevan(middle) Aragats (Geiger) Stand(100)