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Frequencies of terrestrial whistlers are 1 kHz to 30 kHz, while radio telescopes work at 30 megahertz to 300 gigahertz. Radio telescopes would need to be 1000x larger in order to resolve the direction of extraterrestrial whistlers.


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CONVECTION is a PROCESS: It is the vertical movement of matter (due ultimately to gravity) as a result of its relative density. A density change is often (but not only) caused by heating, which causes expansion of a parcel of fluid (gas or liquid) or even of some plastic solids. When a suspended solid or parcel of fluid is heated, the resultant expansion of ...


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