[time-nuts] Re: Dense pressure data of the last 24h and the next 48h

[Hal Murray]

anders.e.e.wallin at gmail.com said:
> AFAIK we only have 10 minute data...

What is the wavelength (in seconds) of an eruption?  What's the Nyquist 
sampling rate?

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,

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What sort of sampling rates do metrologists want or get?

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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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