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Related, interesting HN discussion a month ago: https://news.ycombinator.com/item?id=10810390 https://news.ycombinator.com/item?id=10810390 Submarines can alt
by twoodfin 11y ago
Related, interesting HN discussion a month ago:
https://news.ycombinator.com/item?id=10810390 https://news.ycombinator.com/item?id=10810390
Submarines can alter their magnetic fields, but gravitational fields are a good bit more tricky, and can apparently also be exploited for detection.
- deutronium 11y agoI was reading this https://earth.esa.int/documents/973910/1006684/RR3.pdf https://earth.esa.int/documents/973910/1006684/RR3.pdf (Satellite Gravimetry) earlier today after seeing this article as I remembered nuclear submarines used gravimeters. Is there any information on them being used to track other subs, as I was wondering if that was possible, I know they're apparently used to map the sea floor though. Edit: This is interesting: "He showed a figure of gravity increasing by about 2 microgal over a 4-h period as men shoveled snow from the roof of the SG station" - http://ethesis.helsinki.fi/julkaisut/mat/fysik/vk/virtanen/studieso.pdf http://ethesis.helsinki.fi/julkaisut/mat/fysik/vk/virtanen/s...
- VLM 11y agoThe mass of a bucket of water, and an equally full bucket with a sub in it, is equal. Otherwise the sub would sink like an anchor or float like a boat.
- ISL 11y agoTrue. The gravity gradients from the sub may be different, though.
- cocoablazing 11y agoDo you have any evidence a submarine conducting normal operations has been detected with a gravimeter?