Solar cycle 24 ( Jan 2008-present)

IMF & geomagnetic parameters

Negative polarity (2008-2012)

Toward days

Away days

T’-A’

No. of Days

Average

No. of Days

Average

Average

IMF (nT)

908

4.71 ± 0.3

657

4.74 ± 0.4

−0.03 ± 0.5

aa

908

12.25 ± 1.5

657

11.40 ± 2.3

0.85 ± 2.7

Ap

908

6.9 ± 0.8

657

6.43 ± 1

0.47 ± 1.1

Kp

908

13.95 ± 1.3

657

13.36 ± 1.6

0.6 ± 2

DST

908

7.17 ± 0.9

657

6.26 ± 1.1

0.91 ± 1.4