Physics Department Seminar University of Alaska Fairbanks

J O U R N A L    C L U B

Measurements and Analysis of Ionospheric
Ultra-Low Frequency (ULF) Waves
Marc Lessard
Research Associate Professor
University of New Hampshire

Ultra-Low Frequency (ULF) waves (having frequencies from a mHz to a few Hz) have been observed for decades. The subclass of waves with frequencies near afraction of 1 Hz includes several types of waves. Electromagnetic ion cyclotron waves, which play an important role in radiation belt dynamics, are perhaps the most commonly observed signature, with a recent study finding 300 occurrences in a single year of data. Still, the propagation of these waves and their interaction with radiation belt particles is not well understood. Other types of signatures include waves observed at substorm onset, in the cusp region in conjunction with Poleward Moving Auroral Forms (PMAF), waves associated with pulsating aurora, etc. In this talk, techniques for observing these waves will be discussed, as well as a review of current topics in this field.

Friday, 30 January 2009
Globe Room, Elvey Building
3:45 PM