https://www.facebook.com/groups/actividadsolar/ For years I have been using Solar Dynamics Observatory AIA and HMI images and movies to look at the sun. Recently I found that solar observers were mostly using H alpha images where those black lines show up. In the AIA 171 Angstrom movies they are clear and much more detailed. And I wonder
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https://www.facebook.com/reel/1720010422134224 https://x.com/RichardKCollin2/status/1843388114640699822 My Comments: With low cost 3 axis time of flight gravimeter arrays one can have gravitational GPS and compass, and 3D gravity imaging When you calculate the vector acceleration of the sun at a superconducting gravimeter station on earth, you have to use the position of the sun for the time when the
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Anton Petrov: Evidence of a Donut Like Structure Hidden Inside Planet Earth at https://www.youtube.com/watch?v=GljciCwOfyc Gravitational imaging arrays using low cost but very sensitive gravitational sensors can use time of flight correlation to image regions anywhere inside the earth at high resolution. There are many desktop, even portable alternatives. Atomic clocks, gravity gradiometers, many kinds of
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Postholer – GIS Resources @postholer Revolutionary Quantum Compass Could Soon Make GPS-Free Navigation a Reality Revolutionary Quantum Compass Could Soon Make GPS-Free Navigation a Reality Replying to @postholer Is an atom interferometer something to look at? Yes, but this one is not sensitive enough or fast enough. Too many cooks. Too expensive R&D overhead. I
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I was reviewing the life of Hans Otto Meyer who started out at Basel University, spent most of his career at Indiana University in Physics. I found him looking at photomultipliers as I was searching for calibration data on Hamamatsu detectors. Any experiments that run continuously and precisely will run into gravitational potential effects. So
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Yijun Jiang, Thank you, this comes at a good time. I was reviewing all the technologies that can replace LIGO with atom interferometer and other technologies. Some of them are not very mature yet or the groups have not put in a lot of effort to look at black holes. But there are lots of
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Diamagnetic magnetic levitation at nanoscale is one way to make chip scale gravimeters. A “gravimeter” is an accelerometer that can track the sun and moon by their gravitational fields precisely. https://arxiv.org/abs/2105.13555 The three axis signal allows “gravitational GPS/GNSS” and “gravitational compass” in 3D. Array for imaging atmospheres, oceans, magma and interiors of things. After
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https://en.wikipedia.org/wiki/Modified_Newtonian_dynamics Their a0 is 1.2E-10 meter/second^2 which is the sensitivity needed to follow the sun moon tidal gravity signal at the earth’s surface. Potential changes at the sun and moon (and on earth) “diffuse” at the speed of light and change the local gradients. Also, electrons and protons from suns – a few charges easily
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Nils Berglund: A simplistic model for tides – instantaneous forcing at https://www.youtube.com/watch?v=XH7tvGb42s4 The easiest model that works precisely is to use the positions of the sun, moon, and earth from JPL Horizon. Then for a particular point on earth (station) calculate the vector GM/r^2 acceleration of the sun acting on the station, minus the sun
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https://twitter.com/RichardKCollin2/status/1741046739237228715 Sensitive three axis gravimeters show that vector sun moon tidal signals are nearly perfectly Newtonian, only requiring three linear regressions (6 numbers) to lock a station to the sun and moon for position and orientation sensing. Many types now. https://twitter.com/RichardKCollin2/status/1693165581329985565 This is one month for the vertical component of the vectors signal.
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