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.., .. INTERELATION OF GEOMAGNETIC DISTURBANCES AND SOLAR WIND PARAMETERS Ivanov V.G., Miletsky E.V. Central astronomical observatory of RAS at Pulkovo
Abstract Interrelations between characteristics of geomagnetic activity and parameters of the solar wind are investigated. Daily values of the corresponding indices for years 1966-2001 are used for the analysis. Relatively simple relations that link variations of geomagnetic activity and solar wind parameters are found. The obtained models allow quantitative estimation of influence of the solar wind parameters upon geomagnetic activity. Such an approach essentially simplifies both physical interpretation of the models and their comparing with known relations.

, , , -- , . (., , [1,2] [3]) , . , , . , , , , , , . ( 1966-2001 ): V, T N , Bx , By , Bz ( GSE), (|B|) (B) . , (V, T, ..).


aa, Kp, Dst . .1 . , V Kp log aa ( , ). 1. c aa 0.51 0.46 0.09 0.42 -0.21 0.41 log aa 0.56 0.45 0.06 0.43 -0.21 0.40 Kp 0.59 0.44 0.03 0.46 -0.22 0.38 -Dst 0.43 0.33 -0.11 0.28 -0.23 0.25

V B N T Bz Bz

700 650 600 550 500

25150

13 12 11 10 9 8

B, nT

14

12

10

V, km/s
450 -3 2.5x10
5

7 6 3 1 -3 -2 -1 0 1 2 3

8

N, cm
-3 -2

-3

-2

-1

0

1

2

-1

0

1

2

3

T, K

5 2.0x10
5

Bz, nT

0 4

1.5x10

5

-1 3

1.0x10

5

-2

Bz, nT
-3 -3 -2 -1 0 1 2 3 -3 -2 -1 0 1 2 3

2

-3

-2

-1

0

1

2

3







.1.


.1 . , aa- (25-50, 50-100, 100-150 150), , . , , , . , (. [4,5]). , , , . . Y Xi : Y = i ci Xi + const : log Y = i ci log Xi + const . , log Y = i ci log Xi + i ci' Xi' + const
. ,

, aa-, , Bi/B, Bi/B, -- . aa C·V1.9 |B|0.9 (|B|/B)
0.8

N0.2 exp(-0.65 Bz/B+0.54 Bz/B+0.29 By/B).

, aa C·V2 |B| N0.4, [2], . ,


Bz (. .1), . r log aa (" ") 0.79, , (. .1). aa 0.73, DST -- 0.57. . .2, 0.55. , (r>0.88, .2) . aa C V2.1 (|B|/B)
1.3

|B|0.7 N0.3 exp(-0.90 Bz/B+0.57 Bz/B)

aa C V1.9 |B|0.75 N0.2 exp(-0.56 Bz/B+0.30 By/B).

. , .
1.0

0.9

0.8

r
0.7 0.6 0.5 1965

1970

1975

1980

1985

1990

1995

2000



.2 , , ,


. aa C·V1.7 |B|0.7 N0.1 -- 0.86. (.3) 0.5, , .
1.0

0.5

r

0.0 1965

1970

1975

1980

1985

1990

1995

2000



.3 j= 0 i=0 1 2 2 1 41% 39% (3%) 21% 2 14% 25% 61% (1%)

97% (96%) 2% 1%

, , . aa-c (, 60 85) : aa<60 -- 0, 6085 -- 2 (" "). .2 " " : aij , (i) (j) i j . , . -


, , " ", 2, 15%. , , , : V ( ), B ( ), Bz ( ), |B|/B, B ( ), N ( ). aa- r=0.8. . , . 03-02-17505, 04-02-17560 05-07-90107, " `"-"" -16 " ''. 1. Akasofu S.-I., Chapman S. and Venkatesan D., J. Geophys. Res., v.68, p.3345 (1963). 2. Murayama T., in Y. Kamide and J. Slavin (ed.), Solar Wind-Magnetosphere Coupling, Terrapublication, Tokyo, p.119 (1986). 3. Feldstein Y.I., Solar Phys., v.59, p.83 (1992). 4. .., .., .., - , . 2, .137 (2002). 5. .., .., . . " ". 2002, -, .195.