High-frequency Active Auroral Research Program (HAARP) is based in Alaska and it's a high-power, high frequency (HF) transmitter for studying the ionosphere. The principal instrument is a phased array of 180 HF crossed-dipole antennas capable of radiating 3.6 megawatts into the upper atmosphere and ionosphere. Transmit frequencies are selectable in the range of 2.7 to 10 MHz.
The research team have announced that they will be carrying out tests from the 8th to the 10th of May 2024.
The press release is shown below and I've added a map to show location and distance.
Date: May 2, 2024
To: Amateur Radio & Radio Astronomy Communities
From: HAARP Program Office
Subject: Notice of Transmission
The High-frequency Active Auroral Research Program (HAARP) will be conducting a research campaign May 8-10 UTC, with operating times specified in the table below. Operating frequencies will vary, but all HAARP transmissions will be between 2.8 MHz and 10 MHz. Actual transmit days and times are highly variable based on real-time ionospheric and/or geomagnetic conditions. All information is subject to change.
This campaign is being conducted in support of research proposals from the University of Alaska Fairbanks, and is studying mechanisms for the detection of orbiting space debris. Space debris poses a major risk to all space operations, including manned spacecraft and communications satellites. The experiments being performed at HAARP will help identify ways to improve collision detection on satellites.
For more information on space debris, see the NASA Orbital Debris Program Office’s FAQ at https://orbitaldebris.jsc.nasa.gov/faq/. For more information on research at HAARP, see the online HAARP FAQ at https://haarp.gi.alaska.edu/faq.
Note that these experiments will operate at frequencies based on the f0F2 frequency from the Gakona ionograms. In general, transmissions will be very close to the f0F2 frequency. There are no specific data collection requests from funded investigators, but reception reports are appreciated and may be submitted to uaf-gi-haarp AT alaska DOT edu or to: HAARP, PO Box 271, Gakona, AK 99586
For updates on ionospheric conditions in Gakona, please consult ionograms from the HAARP
Diagnostic Suite: https://haarp.gi.alaska.edu/diagnostic-suite
Additional Resources for Reading Ionograms
Understanding HF Propagation and Reading Ionograms from Bootstrap Workbench:
https://www.youtube.com/watch?v=oTFKNCo3Cl8
Additional Resources for Reading Ionograms
Understanding HF Propagation and Reading Ionograms from Bootstrap Workbench:
https://www.youtube.com/watch?v=oTFKNCo3Cl8
Reading Your Ionogram-Keeping It Simple from John (VE6EY):
https://play.fallows.ca/wp/radio/shortwave-radio/reading-your-ionogram-keeping-it-simple/
The image above is an annotated ionogram from HAARP that describes features that may be of
interest. Note that f0F2 is calculated at the top left.f0F2 is the critical frequency of the F2 layer of the Earth’s ionosphere. This is the frequency at
which radio signals stop refracting off the ionosphere and begin passing through to outer space.
For certain HAARP experiments that deal with interactions in the ionosphere, transmission
frequencies below f0F2 are desirable, while for other experiments (such as those involving high altitude satellites), staying above f0F2 is required.
Supplement to HAARP Notice of Transmission
General Information for HAARP Radio Enthusiasts:
