Personal Webster. Not affiliated with any agency. Copyright 2000-2017 R. C. Mazur, VA3ROM.
CALLING ALL RADIO ENTHUSIASTS! On 21 August 2017 a total solar eclipse tracks across America with the path of totality from the U.S. northwest left coast southeast towards the right coast. Canadians will experience a partial eclipse of varying percentage of the sun covered up by the moon and the ionosphere may or may not experience increased radio propagation from the 40 metre band on down as day becomes twilight or night for a few minutes depending on your location (the lower the frequency the more pronounced the effect). Many commercial U.S. AM radio stations, located in the path of totality, are having special Solar Eclipse broadcasts to see how far their normal daylight transmissions are extended by totality with the disappearance of the ionosphere's D (absorption) layer during totality, which may increase AM radio propagation to near night time distances albeit for only a few minutes.

Maximum solar ionization for any given area (solar ultraviolet irradiation of the ionosphere) occurs between 2 to 3 PM local time. All regions in the Americas with mid-eclipse occurring during this time, but outside of totality, may experience brief increases in low band propagation if enough of the sun is covered and the ionosphere can cool down enough to allow free electrons to recombine with ions over your head (very high above). The U.S. areas in the path of totality will definitely have markedly increased low band propagation with the brighter stars becoming visible!

The CG3EXP WSPR tri-band data beacon (onboard the Canada C3 expedition ship POLAR PRINCE) will be transmitting from the high Arctic at that time (west of Resolute, Nunavut) in the famous Northwest Passage and inside the Aurora Borealis ring. It's beacon transmissions may or may not be affect as they travel south into areas of increasing solar coverage.This is an Amateur Radio first to have a roving high Arctic WSPR beacon operating during the eclipse, along with hundreds of Amateur Radio and other hobbyist receiving and transmitting stations on the air for this historic event. There are thousands of web sites dedicated to this one very important and significant solar eclipse, which will probably be the most monitored, recorded and analyzed in history, so I've only provided are a handful of those sites specifically related to radio. Many of us are also amateur astronomers and we'll be outside watching the eclipse as our robot receiving (or transmitting stations) silently do their work.
It would be great to have as many Amateur Radio operators and other radio hobbyists on air a few hours before, during and after the solar eclipse transmitting, receiving (or both) and streaming real-time propagation data to the WSPRnet (WSPR), or Reverse Beacon Network (Morse and RTTY) or PSK Reporter (PSK and JT modes). This invaluable data will be used by hobbyists, scientists and researchers (worldwide) studying radio propagation and the ionosphere.
For those interested in the non-radio aspects of the eclipse, if you have a PWS (personal weather station) feeding related weather web servers (Weather Underground, et al) or just a simple digital (or analog) data display with no internet connectivity will work. Even a partial eclipse could have slight effects on air/dewpoint temperatures, relative humidty, wind speed and direction, which you can observe and record. For those in the U.S. in the path of totality, day will become night with sudden and dramatic metorological changes.
Personal web site. Not affiliated with any agency. Copyright 2000-2017 R. C. Mazur, VA3ROM.
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A UV (ultraviolet) sensor will detect changes in these levels during various phases of the eclipse, and the newest digital PWS usually have one or can add one. As the moon slowly crosses the sun, you can monitor ambient light levels using a LUX meter plus measure sky temperatures with an IR (infrared) thermometer. Because the entire crossing takes more than a couple of hours (for most of us) a lot of data can be collected for later analysis. Or you can build a microcomputer unit (MCU) based meter and data logger "gadget" (Arduino, PICAXE, Raspberry Pi, et al). And Android and iTunes LUX meter applications are available for smartphones. These instruments should point straight up at clear blue sky and in shadow protected from direct sunlight. 
Real-time & simulated views of the eclipse from any location on earth.
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Article on "The Solar Eclipse & Ham Radio".
All kinds of solar data & methods of metering Sol.
How to safely observe solar eclipses & general information.
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How to "observe" the solar eclipse using an AM radio receiver. With an excellent technical description of what goes on with the ionosphere during solar eclipses
Radio science & citizen investigation using Amateur Radio.
Article on how solar eclipses affect terrestrial weather & the lack of eclipse weather models.
Measuring the Temperature of the Sky and Clouds
My photographer's digital LUX meter, smartphone LUX meter app, and IR thermometer used to measure blue sky illumination and temperature. Insert (top left) is my Arduino Uno digital RGB-LUX plus analog temperature sensors data logger (see my ATD017 TCA article). There are many other atmospheric variables you can meter: ozone, water vapour, aerosols, insolation, etc.
Indoor Illumination During Solar Eclipse
2012 Effects of Solar Eclipse on Photosynthesis in Coastal Wild Conditions
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ATD017 Ardunio: Part Duo
(Jan-Feb 2015)
Supplementary Articles
Supplementary Programs
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Detailed solar eclipse chronology & what to expect & look for.