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  2. Ceilometer - Wikipedia

    en.wikipedia.org/wiki/Ceilometer

    A ceilometer is a device that uses a laser or other light source to determine the height of a cloud ceiling or cloud base. [1] Ceilometers can also be used to measure the aerosol concentration within the atmosphere. [2] A ceilometer that uses laser light is a type of atmospheric lidar (light detection and ranging) instrument. [3] [4]

  3. Plasma stealth - Wikipedia

    en.wikipedia.org/wiki/Plasma_stealth

    The Journal of Electronic Defense reported that "plasma-cloud-generation technology for stealth applications" developed in Russia reduces an aircraft's RCS by a factor of 100 (20 dB). According to this June 2002 article, the Russian plasma stealth device has been tested aboard a Sukhoi Su-27 IB fighter-bomber.

  4. Atmospheric optics - Wikipedia

    en.wikipedia.org/wiki/Atmospheric_optics

    Cloud droplets tend to scatter light efficiently, so that the intensity of the solar radiation decreases with depth into the gases. As a result, the cloud base can vary from a very light to very dark grey depending on the cloud's thickness and how much light is being reflected or transmitted back to the observer.

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  6. High-frequency Active Auroral Research Program - Wikipedia

    en.wikipedia.org/wiki/High-frequency_Active...

    In early May 2013, HAARP was temporarily shut down, awaiting a change between contractors to operate the facility. In July 2013, HAARP program manager James Keeney said, "Defense Advanced Research Projects Agency (DARPA) is expected on site as a client to finish up some research in fall 2013 and winter 2014."

  7. Ceiling projector - Wikipedia

    en.wikipedia.org/wiki/Ceiling_projector

    The arm is mounted onto a curved scale that is marked both in meters and the coded cloud height (feet). The observer looks through the eyepiece and sets the sight onto the spot projected on the cloud and reads the height from the attached scale. When the cloud is thin the beam of light may penetrate into the cloud.

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    Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!

  9. Wednesday debate, vote in Senate could save F-15E Strike Eagles

    www.aol.com/news/wednesday-debate-vote-senate...

    (The Center Square) – Efforts to push back retirement of the F-15E Strike Eagles and save more than 500 jobs at a U.S. Air Force base in North Carolina could be ready for the president's ...

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