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Arecibo Observatory on Twitter @NAICobservatory

HAM Radio and WebSDR’s listening to Arecibo

Arecibo Observatory Enhanced HF Ionospheric Heating Instrument

Arecibo Observatory, PR-625, Arecibo, Puerto Rico

18.34421900121537, -66.75269217609858

www.naic.edu

  • Antennas: 6 crossed dipoles, 5.1 MHz (3 x 25.5 meters) 8.175 MHz (3 x 14.5 meters), 98 meter Cassegrain screen hexagonal sub-reflector, 305 meter dish primary reflector. [4]
  • Frequency: 5.1 - 8.175 MHz
  • Power: 600,000 Watts (600 kW, 100 kW x 6)
  • ERP: 200,000,000 Watts (200 MW)
The investigators will use the enhanced instrument cluster at Arecibo Observatory (AO) to gain new insight into the complex nature of the space-atmosphere interaction region (SAIR). The new High Frequency (HF) heating facility with the ISR (Incoherent Scatter Radar) and other instruments provides a unique opportunity to study heating-related aeronomic and plasma physics problems. This includes the rapidly-imaged observation of airglow at 557.7 nm, 630.0 nm and 427.8 nm during ionospheric “heating” campaigns to understand the role of HF-heating in generating plasma bubbles, or modulating them if already present, and to understand the role of secondary suprathermal electrons in producing airglow at different wavelengths. This research will also yield insight to the heating process, including locating ionospheric “hot-spots”, yielding details of the electron collision process, elucidating the role of Langmuir and ion-acoustic waves in the strongly heated regions, and study of heating effects in Sporadic E. The latter study will include Ca+ metal-lidar observations as further defined by 555.7 nm imaging as well as ISR and HF radar results. HF heating of the ionosphere offers a unique opportunity to investigate the plasma heating process and its effects on the neutrals in a controlled (experimental) fashion. Outside of the heating campaigns, a database of 630 nm all-sky camera images from other locations will be assembled collaboratively to investigate the global context of the omnipresent ~1 hr period ionospheric waves, and associated dynamics, first identified with the AO ISR. This work will utilize other AO instruments, including the resonance and Rayleigh lidars, to investigate the role of wave coupling from lower atmospheric regions. Also, a proposed new CCD camera will allow high speed imaging to better understand HF heating effects and linking optical and radar meteors to study meteoroid aeronomy. The response of the SAIR to sudden changes in the environment caused by heating will be explored with the collaborative use of multiple instruments, thus informing numerous geophysical research areas. The multidisciplinary nature of this work will help to establish collaborations with plasma physicists, modelers, and space weather scientists. It will also advance the AO cluster capabilities with the addition of a User-Owned, Public Access (UOPA) high frame rate CCD to the current imager and help in establishing international collaborations. Students representing minorities from local universities in Puerto Rico will be encouraged to participate in observations and data analysis. They will be involved in the improvements of the optical systems including training on AO instrumentation and the application of these instruments to study aeronomy of the SAIR.
The new facility will replace an earlier ionospheric heater in Islote, Puerto Rico, that was destroyed by Hurricane Georges in 1998. Rather than rebuild that installation, the new instrument will use the observatory’s 1000 foot dish for its antenna. This will keep all research activities involving ionospheric modification at the observatory proper.

Plans call for a design based on a Cassegrain screen concept of phased array at the bottom of the dish feeding a sub-reflector mesh that hangs above the dish from three support towers. Breakall and his team of graduate students at Penn State have done all of the electrical design and modeling of this new antenna system.

“There are three crossed-dipoles for 5.1 MHz and another three for 8.175 MHz, forming an array that will beam energy up to a net mesh reflector that will hang from the three big towers,” Breakall explained. “This Cassegrain screen will then reflect energy back down to the 1000 foot dish and beam an effective radiated power of hundreds of megawatts up to the ionosphere to modify it.” Each dipole is fed from a 100 kW transmitter, yielding a total transmitted power of 600 kW.

An even earlier HF heating antenna system also was suspended from the platform above the dish and driven by a single 100 kW transmitter over a frequency range of 3 to 10 MHz. That design suffered from arcing problems and was taken out of service in the 1970s. [6]

Arecibo Observatory Enhanced HF Ionospheric Heating Instrument

Arecibo Heater on ClimateViewer 3D

Arecibo Observatory Enhanced HF Ionospheric Heating Instrument Map on ClimateViewer Mobile and ClimateViewer 3D

HAARP and the Sky Heaters (FAQ)

https://climateviewer.com/haarp/

haarp ionospheric heater map climateviewer 3D

View Map on ClimateViewer Mobile and ClimateViewer 3D. RED = Ionospheric Heater, DARK BLUE = Incoherent Scatter Radar (ISR), GREEN = EISCAT (ISR), LIGHT BLUE = Historic facilities (now closed). There are five major Ionospheric Heaters and multiple smaller facilities in operation today, not counting the Sky Heaters on trailers, submarines, and boats

Ionospheric Heaters: How HAARP really works

https://climateviewer.com/2014/10/18/ionospheric-heaters-how-haarp-really-works/

“Ionospheric Heaters: How HAARP really works”Read the Article • Watch this Video on YouTube

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Creative Commons LicenseArecibo's Ionospheric Heater is Boiling the Tropical Sky November 3-9, 2018 by Jim Lee is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License. Based on a work at climateviewer.com/. Permissions beyond the scope of this license may be available at climateviewer.com/terms.

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