ARLA/CLUSTER: Estudo da ionosfera desde Arecibo, Porto Rico com 600 kW desde 24 a 31 de julho em 5 125 e 8 175 MHz

[João Costa > CT1FBF]

Arecibo ionosphere HF radio modification campaign!

*Chris Fallen KL3WX* reports on the upcoming Arecibo, Puerto Rico
ionosphere HF heating campaign during July 24-31, 2017

The new Arecibo ionosphere HF heater nominally transmits 600 kilowatts net
power (100 to 200 megawatts effective radiated power) and has a unique
Cassegrain dual-array antenna design that increases gain of three crossed
dipoles for each band using the signature 1000 ft spherical dish reflector.

During the upcoming campaign, the Arecibo HF transmitter is limited to two
frequencies, 5.125 and 8.175 MHz. Campaign HF transmissions will start at
approximately 1600 hours UTC and be active approximately 24 hours per day,
with some occasional downtime for maintenance and other activities lasting
one or more hours.

Generally, the 8.175 MHz transmissions will occur in the daytime when foF2
is expected to exceed that value, between approximately 1830 and 2230 hours
UTC. Otherwise the HF transmissions will occur at 5.125 MHz. The Arecibo
incoherent scatter radar (ISR) will also be active throughout most of the
campaign, but since it operates in the UHF band at 430 MHz long distance
propagation is not expected.

These transmissions will be in the vertical direction so this is an
excellent opportunity to observe NVIS from a powerful transmitter in Puerto
Rico. My own experiments are O-mode polarized CW (kicking off the campaign
at 1600 hours on 24 July 2017 UTC) for measuring plasma wave and turbulence
effects. Experiments by other scientists may use X-mode polarization. To
the best of my knowledge, all experiments will be CW with no amplitude or
frequency modulation.

Read more about the Arecibo HF facility at
http://www.naic.edu/~astro/ao50/Arecibo_50th_Paper_
Breakall_revised_Oct_23_2013.pdf
<http://www.naic.edu/~astro/ao50/Arecibo_50th_Paper_Breakall_revised_Oct_23_2013.pdf>

HAARP Alaska Operations News
https://sites.google.com/alaska.edu/gakonahaarpoon/operations-news

Chris Fallen KL3WX is assistant research professor in the University of
Alaska Fairbanks Geophysical Institute, Space Physics group
https://twitter.com/ctfallen
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