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NASA Discovers a Long-Sought Global Electric Field on Earth
- RandomBK 2y agoPotentially dumb question: wouldn't the existence of a global magnetic field already imply the presence of a global electric field? Or is this discovery a separate unrelated electric field?
- est 2y agoper Faraday's law, a moving magnetic field implies an electric field
- darig 2y ago[dead]
- femto 2y agoVarying electric and magnetic fields are coupled (to form electromagnetic radiation). Static electric and magnetic fields can exist separately.
- werediver 2y agoA permanent magnet produces magnetic field, but not electric field (unless it's electrically charged, but that's usually not the case), so no, magnetic field doesn't automatically imply electric field (charge).
- s_dev 2y agoIsn't electricity and magnetism the same force?
- junon 2y agoNot a physicist so this may not be related but AFAIU magnetic fields must change to produce current. Just having a magnetic field does not imply electrical current.
- amelius 2y agoI think what GP meant is that (from one viewpoint) magnetism is an emergent property of the electric field and relativity. Here is a simple explanation: https://www.youtube.com/watch?v=1TKSfAkWWN0 https://www.youtube.com/watch?v=1TKSfAkWWN0
- stinos 2y agoI think OP is asking: if there's a static magnetic field but conductive stuff (say, the oceans) moves through it, doesn that not induce an electric field?
- LtVodka 2y agoWould it be possible to listen to it? Would it sound like static or does it has a frequency?
- wizardforhire 2y ago“ On May 11, 2022, Endurance launched and reached an altitude of 477.23 miles (768.03 kilometers), splashing down 19 minutes later in the Greenland Sea. Across the 322-mile altitude range where it collected data, Endurance measured a change in electric potential of only 0.55 volts.”
- vintagedave 2y ago0.55 volts. Would this be enough to use for electricity generation (visualising some large, multi-thousand-kilometer cable pole-to-Europe/Canada, for example?) What is the amperage, what could this reasonably be used for?
- zeroping 2y agoWe might need some superconductors to make use of a voltage that low across distances that great. But we have been making progress on higher-temperature superconductors.... Still, don't hold your breath. We have this awesome geothermal temperature gradient, with hot rocks underneath us if we just dig down a few kilometers, occasionally less. Unfortunately, it's only cost effective to use in a rare few places.
- ianelbert 2y agoSo Tesla was right?
- xeonmc 2y agoIs this mechanism akin to the spontaneous polarization of piezoelectric materials?
- justinclift 2y agoThe photo of the rocket launching is kind of wild. Seems like it destroyed the launch tower on the way up?
- Npgreader 2y agoThat's not the launch rail exploding, it's a styrofoam box that is built around a portion of the rocket as insulation. The payload was under a warm dry nitrogen purge before launch to keep certain components in good shape. The styrofoam is colored black so that the chunks can be easily collected from the snow.