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The Australia Telescope National Facility Colloquium
11:00-12:00 Fri 24 Nov 2006

ATNF Marsfield Lecture Theatre

Bill Coles

(UCSD/ATNF)

The Interstellar Medium, Turbulence, and Radio Scattering - Bill Coles colloquium

The interstellar medium appears to be turbulent on a range of scales which is
large, even by astronomical standards. Different observers have quite different views of
the medium. Spectroscopists are able to get a measure of line-of-sight velocity variations
at large scales - typically 10's of parsec. Observations of intensity scintillation (ISS) of
compact sources such as pulsars or AGN's provide a measure of electron density
fluctuations at much smaller scales - typically 105 km. Pulsar observers are also able
to measure variations in the electron column density or "dispersion measure" over
intermediate scales - typically 10 AU. Tiny scales for the spectroscopist are giant
scales for the pulsar person. I will speculate wildly on some of these issues biassed by
my view from the bottom of the ISM range and my experience with the solar wind.

More information

Contact

Ilana Feain
Ilana.Feain@csiro.au

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