HELLO Observatory
Observatory

Observatory

  Magnetometers | Riometers | All-sky camera | Ionosondes | Weather station | Infrasound measurements | Data license  
  -Description   -Related graphs   +Examples of events   -K-index tables   -Long-term statistics   -Related data and links   -Realtime data  

The signature of an auroral substorm on the magnetometer.

The substorm 'onset' is at 21:05 UT and is indicated by the sharp decrease in the northward (x) component of the magnetic field.

You can also see the aurora and the riometer record for this event

A sudden storm commencement.The magnetosphere is compressed by the arrival at a shock at the magnetopause. The SSC is at 1231 UT. You can also see the riometer record for this event.