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BEGIN:VEVENT
DTSTAMP:20260428T062855Z
DTSTART;VALUE=DATE-TIME:20181203T150000
DTEND;VALUE=DATE-TIME:20181203T160000
SUMMARY:Dmitrii Kolotkov (ÌÇÐÄTV): Dispersive properties of slow magneto
 acoustic waves in a plasma with heating/cooling misbalance
TZID:Europe/London
UID:20181203-8a1785d866c4e3a70166c97392cc2d1a@warwick.ac.uk
CREATED:20181127T221252Z
DESCRIPTION:Slow magnetoacoustic waves are omnipresent in both natural an
 d laboratory plasma systems. The appearance of dispersive properties of 
 the slow magnetoacoustic waves\, caused by the wave-induced misbalance b
 etween cooling and heating processes is discussed. The wave dispersion c
 ould be attributed to the presence of characteristic time scales in the 
 system\, connected with the plasma heating or cooling due to the competi
 tion of the heating and cooling processes in the vicinity of the thermal
  equilibrium. The dispersion is manifested by the dependence of the effe
 ctive adiabatic index of the wave on the wave frequency\, making the pha
 se and group speeds frequency-dependent. The wave evolution is shown to 
 be controlled by the dispersion\, as well as by the amplification or att
 enuation associated with the thermal misbalance too. As an example\, slo
 w magnetoacoustic waves in the plasma of the solar corona are considered
 . A broadband wave evolution is found to show typical dispersive behavio
 ur\, such as broadening and formation of an oscillatory wake. The disper
 sive effects are most pronounced in the vicinity of a characteristic fre
 quency determined by the thermal misbalance. The occurrence of this disp
 ersion affects the efficiency of nonlinear cascade\, leads to the format
 ion of quasi-periodic wave trains\, and modifies the effective values of
  the adiabatic index and the apparent sound speed.
LOCATION:PS128
CATEGORIES:CFSA Seminar
LAST-MODIFIED:20181127T221252Z
ORGANIZER;CN=Anne-Marie Broomhall:
END:VEVENT
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