Table 2 Planetary ionosphere-plasmasphere storms deduced from IGS-TEC maps during solar maximum (2000) and solar minimum (2006) and extreme space weather indices used in the present study at the conjugate hemispheres. Root-mean-square RMS deviation, in MHz, between the disturbed and quiet F-region critical frequency is averaged over a number of sites (SS or CP) in the Southern (S) or Northern (N) hemispheres.

1

Jan 11_18

Jan 12_12

19

6.6

56_376

1124

−81

2.31_1.35

2.59_0.92

2

Jan 29_16

Jan 30_08

17

6.1

39_524

745

−33

1.12_1.43

1.15_0.67

3

Feb 11_20

Feb 13_18

47

6.8

111_1088

1124

−133

1.93_1.06

2.18_1.75

4

Apr 06_18

Apr 08_08

39

9.5

300_2511

1550

−288

3.47_1.60

2.07_1.33

5

May 02_12

May 05_16

77

6.6

39_384

901

−37

1.89_1.76

1.80_1.36

6

May 07_04

May 08_04

25

6.5

7_164

509

−10

1.06_1.74

1.57_1.29

7

May 24_00

May 25_10

35

6.4

207_1701

1336

−147

2.60_1.10

2.09_1.22

8

May 30_16

June 01_04

37

6.0

32_532

827

−54

2.88_1.18

1.30_0.96

9

June 08_16

June 09_00

9

6.5

132_1137

1334

−90

1.34_0.47

2.34_1.79

10

July 14_18

July 17_09

64

10.2

400_3442

1657

−301

2.65_1.06

2.03_1.53

11

July 23_15

July 24_03

13

6.1

80_373

1008

−68

0.82_1.57

0.71_0.66

12

July 28_15

July 29_00

10

6.1

67_620

1166

−51

0.85_0.76

1.71_1.40

13

Aug 09_22

Aug 13_00

75

8.2

179_2144

1107

−235

2.16_1.02

1.86_1.22

14

Sep 16_22

Sep 19_00

51

9.4

236_1670

1009

−201

2.92_0.93

1.28_0.64

15

Sep 30_08

Oct 01_00

17

6.3

94_865

1290

−76

2.17_1.58

1.28_1.28

16

Oct 02_08

Oct 05_14

79

8.4

154_2215

1457

−182

3.71_1.18

1.91_1.57

17

Oct 14_06

Oct 15_00

19

6.9

111_777

1133

−107

1.87_0.94

1.25_1.01

18

Oct 22_20

Oct 23_00

5

6.3

39_358

913

−41

0.98_0.58

0.87_0.51

19

Nov 04_10

Nov 04_13

4

7.0

48_427

791

−50

1.37_0.82

1.06_0.84

20

Nov 06_13

Nov 07_10

22

7.4

132_843

1154

−159

2.13_3.09

1.79_1.82

21

Nov 27_12

Nov 29_10

47

6.9

94_1016

1210

−119

1.72_0.82

1.76_1.44

Solar minimum, 2006

22

Mar 18_10

Mar 19_03

18

6.0

94_892

850

−40

0.71_0.49

0.74_0.37

23

Apr 05_01

Apr 06_13

37

6.5

56_522

959

−87

1.34_0.84

1.71_1.02

24

Apr 09_04

Apr 09_23

20

6.0

80_726

726

−80

0.98_0.92

1.44_1.00

25

Apr 13_23

Apr 16_08

58

7.9

132_1151

1437

−111

1.61_1.30

1.80_1.15

26

May 04_12

May 05_13

26

6.5

39_292

1012

−42

0.91_0.56

1.23_0.73

27

Aug 19_15

Aug 21_01

35

6.5

80_942

1637

−71

0.92_0.68

0.84_0.44

28

Nov 09_19

Nov 12_13

57

7.0

80_703

1042

−51

0.98_1.04

1.00_0.75

29

Dec 14_17

Dec 16_17

49

10.9

236_2135

1616

−146

1.80_0.89

1.81_0.85