10
Sep 5, 1996
Nov 26, 1996
Jan 23, 1997
Feb 26, 1997
Apr 2, 1997
May 6, 1997
Jun 4, 1997
Jul 29, 1997
Aug 27, 1997
Jan 14, 1998
May 7, 1998
"space weather"
1000
2000
4000
4000
2245
2256
3000
2686
2281
5507
5210
"space weather forecast*"
189
200
400
400
225
234
300
40
40
415
457
"space weather serv*"
61
64
73
100
143
89
92
88
99
140
103
"national space weather program"
98
108
200
100
140
183
100
40
182
277
303
"freja satellite"
102
105
100
97
97
104
100
40
101
181
195
"spacecraft charging"
145
165
200
200
165
170
200
40
152
304
330
"solar-terrestrial"
3000
4000
7000
7000
3815
3786
5000
3583
3544
7413
7107
"geospace"
900
1000
1000
1000
1066
1001
1000
884
959
2976
2451
"geospace environment model*"
74
78
100
100
103
98
99
40
101
163
155
"geomagnetic disturbance*"
196
200
400
400
258
244
200
40
220
324
533
magnetosphere AND ionosphere
1000
3000
4000
4000
2316
2330
2000
2333
2186
3796
4000
"magnetosphere-ionosphere coupling"
155
179
200
300
218
218
200
40
197
323
390
"space plasma"
1000
2000
3000
3000
1719
1771
2000
2622
1736
3064
3498
"solar wind"
6000
7000
10000
10000
7667
7463
9000
8813
7617
15375
17363