Tag: ionosphere

via HACKADAY: Sferics, Whistlers, and the Dawn Chorus: Listening to Earth Music on VLF

We live in an electromagnetic soup, bombarded by wavelengths from DC to daylight and beyond. A lot of it is of our own making, especially further up the spectrum where wavelengths are short enough for the bandwidth needed for things like WiFi and cell phones. But long before humans figured out how to make their own […]

via the ARRL: Simple 40-Meter Dipole Supports Advanced Mars Radar

The venerable HF dipole has found a new home and purpose in space. The Mars advanced radar for subsurface and ionospheric sounding (MARSIS) on Mars Express uses a simple 40-meter dipole as the antenna for its subsurface sounding radar. The dual-channel low-frequency sounder operates between 1.3 and 5.5 MHz for subsurface sounding and between 100 […]

Arecibo Observatory Ionospheric Heating Campaign Under Way

Arecibo Observatory in Puerto Rico is conducting an ionospheric heating campaign July 24-31, using HF. “The new Arecibo ionosphere HF heater nominally transmits 600 kW net power and has a unique Cassegrain dual-array antenna design that increases gain of three crossed dipoles for each band, using the signature 1000-foot spherical dish reflector,” explained Chris Fallen, […]

Totality-minus-6 months: Ten ways to get fired up for an all-American solar eclipse

Six months from today, millions of Americans will watch the sun darken during a rare coast-to-coast eclipse – and it’s not too early to get into the spirit of totality. It’s definitely not too early to figure out where you’re going to be: Hotel rooms in the track of the total solar eclipse for the […]

NASA discovers mysterious electron superhighway above Earth

Some electrons are speeding above Earth’s surface at nearly the speed of light, and NASA isn’t sure why. According to a new study, the tiny, charged particles were found accelerating to high speeds in an unexpected part of space, farther from Earth than previously realized. The region these fast electrons were found in, known as […]

via HACKADAY: Bombing The Sky For The Sake Of Radio

If you are familiar with radio propagation you’ll know that radio waves do not naturally bend around the earth. Like light and indeed all electromagnetic radiation if they are given a free space they will travel in a straight line. At very high frequencies this means that in normal circumstances once a receiver moves over […]

via the ARRL: Now Free of HAARP, US Air Force Still Wants to Tinker with the Ionosphere

A lot of radio amateurs bemoaning the recent spate of poor HF conditions would love to have a way to improve propagation — perhaps without even having to rely on the whims of the Sun. The US Department of Defense is thinking along the same lines. An August 9 article in New Scientist reports that […]

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