Ionospheric Noise 195 Index Print E-mail
The Index 95 values reflect the intensity of ionospheric activity, i.e., the expected influences onto the relative GPS positions. The I95 values are computed from the ionospheric corrections for all satellites at all network stations for the respective hour. The worst 5% of data are rejected. The highest then remaining value is the I95 index value that is displayed at the graph.

The values of the I95 have the following meaning:

0-2  negligible ionospheric disturbances
2-4  weak ionospheric disturbances
4-8  strong  ionospheric disturbances
>8 very strong  ionospheric disturbances