Properties of Turbulence in the Very Local Interstellar Clouds
  We have investigated the degree to which turbulence in the Very Local
Interstellar Clouds resembles the highly-studied turbulence in the solar corona
and the solar wind. The turbulence diagnostics for the Local Clouds are the
absorption line widths measured along 32 lines of sight to nearby stars,
yielding measurements for 53 absorption components (Redfield and Linsky 2004).
We have tested whether the Local Cloud turbulence has the following properties
of turbulence in the solar corona or the solar wind: (a) velocity fluctuations
mainly perpendicular to the average magnetic field, (b) a temperature
anisotropy in the sense that the perpendicular temperature is larger than the
parallel temperature (or at least enhanced relative to expectation), and (c) an
ion temperature which is dependent on the ion Larmor radius, in the sense that
more massive ions have higher temperatures. Our analysis of the data does not
show compelling evidence for any of these properties in Local Cloud turbulence,
indicating possible differences with heliospheric plasmas. In the case of
anisotropy of velocity fluctuations, although the expected observational
signature is not seen, we cannot exclude the possibility of relatively high
degrees of anisotropy (anisotropy parameter $\epsilon \sim 0.50 - 0.70$), if
some other process in the the Local Clouds is causing variations in the
turbulent line width from one line of sight to another. We briefly consider
possible reasons for differences between coronal and solar wind turbulence and
that in the Local Clouds.
