NDLI: Solar-System-Scale Microstructure in the Diffuse Interstellar Medium

Content Provider	Springer Nature Link
Author	Hartquist, T.W. Falle, S.A.E.G. Williams, D.A.
Copyright Year	2003
Abstract	The most remarkable discovery of recent years in the study of the interstellar medium has been the identification of spatial structures of sizes down to those of a few times the mean Earth-Sun distance (an Astronomical Unit, AU). Solar-System Scale microstructures are detected in cool clouds (temperatures ∼100 K in which the hydrogen number density is of order 102cm-3, and which are about a parsec in extent (1 parsec =2 × 105 AU).Some microstructures are believed to be much denser (by factors of about 100) than the ambient gas, and therefore significantly over-pressured. They are necessarily short-lived, and dissipate on timescales ∼10 y. They do not originate in conventional nonmagnetic hydrodynamic processes, and their existence indicates that our knowledge of interstellar dynamics has been incomplete. Here, we summarize the evidence for the existence of microstructures, and propose that any that are significantly over pressured are formed in post shock regions of high magnetic pressure due to the excitation of slow-mode magnetosonic waves by the nonlinear steepening of disturbances generated by the Kelvin-Helmholtz and other instabilities. Less over pressured microstructures can be formed by the same nonlinear processes operating in a region in which the magnetic contribution to the pressure is less dominant.
Starting Page	369
Ending Page	375
Page Count	7
File Format	PDF
ISSN	0004640X
Journal	Astrophysics and Space Science
Volume Number	288
Issue Number	3
e-ISSN	1572946X
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2003-01-01
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Astronomy
Content Type	Text
Resource Type	Article
Subject	Astronomy and Astrophysics Space and Planetary Science

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