Earth's magnetosphere historical data

[DanSolo]

Hi,

Earlier this month, I was searching for trends/graphs on solar activity. I found some good sites which I cannot post due to me being a forum noob ;-)

Now, I am looking for the equivalent except this time, in relation to earth's magnetosphere levels (strength)

Does this exist ?

Thanks,
Danny

 

[DanSolo]

Also,

Can anyone confirm how the Earth's magnetic field is generally measured ?

I've read a bit about the Dst, the K indices.

DanSolo

 

[Chronos]

Mapping of the magnetosphere was initiated by the US Navy in the 50's as they charted the ocean floor. NASA became increasingly involved since that time. For a review article see http://www-spof.gsfc.nasa.gov/Education/bh2_1.html