The detection of the lowest critical modes, γ1(1) and γ0(1), for thermal convection in a vertical tube is reported. Their visualization was through the distortion they caused to chemical waves propagating in a manganese‐catalyzed Belousov–Zhabotinsky medium. A time dependent temperature gradient was allowed to develop in the system and the dynamical behavior of spontaneously occurring trigger waves was recorded as magnetic resonance images. The work also illustrates the potential of magnetic resonance imaging to provide information on the temperature dependence of the propagation velocity of trigger waves and of the frequency of pacemaker activity.
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© 1993 American Institute of Physics.
1993
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