• Relatively dispersionlessparticle injections span a broad range in MLT

• Appear to be a “global” mode of auroral activity

• Correlated with a change in the magnetic field (stretching and relaxing) at geosynch orbit over broad MLT range

Examples:• “Global” sawtooth

oscillations occur at ~03:00UT, 05:45UT, 08:30UT,11:30-11:40UT

• More localized in MLT after that Henderson et al., SM31B-08

Characteristics of Sawtooth Oscillations