Physics
Scientific paper
Dec 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsh41b0752g&link_type=abstract
American Geophysical Union, Fall Meeting 2001, abstract #SH41B-0752
Physics
Scientific paper
The diversity of structure of interplanetary shock waves has been revealed over the previous decades of heliospheric research. The Ulysses mission has provided a large reservoir of shock events over its 11 year operational period demonstrating the whole spectrum of interplanetary shock strengths. The thorough analysis of 116 events appearing on the Ulysses shock list in the period 1996-1999 has shown that although in all cases the magnetic requirements set by theory are met, there are cases when some thermodynamic requirements appear not to be. This has led to an examination of the detailed structure using both magnetic field and solar wind data, the latter from the SWOOPS instrument on Ulysses, of the very weakest events. In particular a set of events which show only some aspects of shock structure and are thought to be decaying interplanetary shock waves are considered. These events demonstrate shock structure in terms of high frequency wave data as observed by the URAP instrument on Ulysses but lack the expected magnetic and plasma signatures. The work presented here extends our understanding of shock structure to the very weakest end of the spectrum and possibly beyond what should be termed a collisionless shock wave.
Balogh André
Gloag J. M.
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