The High-Frequency Active Auroral Research Program (HAARP) is a research program that has been used to study the ionosphere since 1990. The facility, north east of the Gulkana Airport, is home to radio transmitters and an array of antennas that can transmit 3.6 megawatts of energy into the atmosphere, in support of research projects.  It doesn’t operate very often, a few times per year at present, but when it does, pilots don’t want to be in the path of this beam of radio energy.  Consequently, we should be on the lookout for a Temporary Flight Restriction (TFR) that will be activated during campaigns, to avoid flying over the facility.  The next campaign is from September 21-25, but there will be others to follow.  Make sure to check NOTAMs, in case this TFR is active when you are flying in the Copper River Basin, or transiting the area to or from the Alaska Highway route to Canada.

Social media notice of the September research campaign at the HAARP facility near Gakona. Watch for a TFR when the facility is in operations.

What is HAARP?
Located about 16 nautical miles northeast of the Gulkana Airport (GKN), the facility houses a 33-acre array of antennas, and when operating, can send pulses of energy into the upper reaches of the atmosphere to stimulate this zone, providing a means to study what happens there. Research has potential implications for understanding properties ranging from the aurora to long-range communications. Until recently, the Air Force operated the facility, in support of Department of Defense research interests, primarily dealing with communication and navigation interests.  In 2015, the facility was transferred to the University of Alaska Fairbanks, Geophysical Institute to operate.  For more information on the facility, see the frequently asked questions document at

Why a TFR?
AOPA has followed the operation of the HAARP facility for many years, primarily out of concerns with possible disturbance to aircraft navigation and/or communications systems. While managed by the Air Force, operations were conducted as a Controlled Firing Area (CFA), meaning that the Air Force had to shut down their transmitter if an aircraft came within a prescribed distance.  They used a radar system to detect aircraft and shut down the transmitter if an aircraft got too close.  When the Geophysical Institute took over operations, FAA re-examined those procedures and decided that the CFA was not adequate, in part due to the high-altitude nature of the impacts. The TFR language is expected to define an area from the surface to FL250.

The HAARP Facility north east of the Gulkana Airport, will have a TFR protecting the airspace around the facility when in operations, similar to this graphic. Check NOTAMs for details and active times.  Map courtesy of

The HAARP Project has re-established a phone number that pilots may call during times the facility is operating.  They have also temporarily re-established a VHF radio frequency, to allow pilots to contact the facility while airborne. These mechanisms should allow pilots operating in the area to have a direct line of communication to obtain more detailed information than the NOTAM is expected to contain, given the real-time nature of changes in the experimental world.  AOPA has also requested that the facility be charted on the Anchorage Sectional, to make it easier for pilots to become familiar with the location of the facility.  In addition to a NOTAM for a TFR, during operations pilots may call the HAARP site, near Gakona, at 907-822-5497, or on VHF radio frequency 122.25 MHz.  Information will also be available on Facebook and Twitter at @uafhaarp.

Stay tuned for more information as the transition from Air Force to university operations proceed. And make sure to check NOTAMs to find out when the TFR is activated.