Hi ….. ahhhh…. but what about modeling the atmosphere? I believe you will find that that is (at least to some degree) limited by the clocks involved.
Bob > On Jun 6, 2019, at 5:17 PM, Michael Wouters <[email protected]> wrote: > > My radio astronomer colleagues tell me that there is about a 20 minute > limit to VLBI observing runs because of atmospheric instability so this > limits improvements to be had from better clocks. My recollection is that a > maser is still sufficient out to 100 GHz. There is a paper about this that > I will dig out later. > > Cheers > Michael > > On Thu, 6 Jun 2019 at 12:01 pm, Joseph B. Fitzgerald < > [email protected]> wrote: > >> >> Regarding Dana's remarks on VLBI, consider the recent black hole image >> released by the Event Horizon Telescope. Measurements were taken at 230 >> GHz, and they would like to begin measurements at 345 GHz. Hydrogen >> masers were used at each telescope. I am no expert, but I strongly >> suspect that a better clock would result in longer/better observations. >> The H maser only runs at 1.42 GHz ... the astrophysicist wizards are >> proposing to do their measurements at about 250 times higher in frequency! >> >> >> -Joe >> _______________________________________________ >> time-nuts mailing list -- [email protected] >> To unsubscribe, go to >> http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com >> and follow the instructions there. >> > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
