On 1/19/22 3:50 PM, Hal Murray wrote:
[email protected] said:
AFAIK we only have 10 minute data...
What is the wavelength (in seconds) of an eruption? What's the Nyquist
sampling rate?
From the shock wave? I'm not sure wavelength is the appropriate
measure - a shock wave starts as a step function, and then eventually
relaxes to some sort of slope.
Is there dispersion of audio signals in the atmosphere? I don't remember
hearing about it. Maybe signals going around-the-world are different due to
interactions with the ground or open top,
Yes, there is dispersion - not in the variation of speed with frequency,
but the atmosphere has different temperatures at different heights, so
that causes dispersion, as do surface winds.
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What sort of sampling rates do metrologists want or get?
----------
What sort of gear do people use if they want to be able to see this sort of
thing?
What is the noise like? Is it mostly from wind? How many bits of signal are
left on a windy day? Or what should I be asking?
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