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The magnetic zenith effect, that airglow excited by heated electrons becomes much stronger when at the magnetic zenith (the direction of magnetic field). [ 16 ] ~100 Rayleighs in O(1 S) 557.7 nm and O(1 D) 630 nm, the main spectral lines in aurora airglows.
The Mystery Spot was the first "gravity-defying" tourist attraction in California and was the most prominent illusion-based tourist attraction in California in the mid-20th century. [20] It has been featured on BuzzFeed , and in the Santa Cruz Sentinel and other newspapers, comic strips, and travel blogs for decades.
The magnetic detector or Marconi magnetic detector, sometimes called the "Maggie", was an early radio wave detector used in some of the first radio receivers to receive Morse code messages during the wireless telegraphy era around the turn of the 20th century.
Photoionization detector; Photomultiplier; Photoresistor; Photoswitch; Phototube; Scintillometer; Shack–Hartmann wavefront sensor; Single-photon avalanche diode; Superconducting nanowire single-photon detector; Transition-edge sensor; Visible Light Photon Counter; Wavefront sensor
The project was originally developed as a joint effort between the SETI Institute and the Radio Astronomy Laboratory (RAL) at the University of California, Berkeley (UC Berkeley), with funds obtained from an initial US$ 12.5 million donation by the Paul G. Allen Family Foundation and Nathan Myhrvold. [3]
Since the late 1970s, various conspiracy theories have risen around exposure to ELF electric and magnetic fields (EMF). [36] External ELF magnetic fields induce electric fields and currents in the body, which, at very high field strengths, cause nerve and muscle stimulation and changes in nerve cell excitability in the central nervous system.
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Forrest M. Mims III is an American amateur scientist, [2] magazine columnist, and author of Getting Started in Electronics and Engineer's Mini-Notebook series of instructional books that were originally sold in Radio Shack electronics stores and are still in print.
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