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<p class="MsoNormal"><b><span style="font-size:11.0pt">Arecibo Call for Ionospheric Modification (HF facility) Proposals<o:p></o:p></span></b></p>
<p class="MsoNormal"><b><span style="font-size:11.0pt">Deadline: Friday, September 28, 2017</span></b><span style="font-size:11.0pt"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> <o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">Dear Colleagues:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> <o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">The Arecibo Observatory invites you to submit proposals for the use of the HF facility during 2018. HF experiments at Arecibo are scheduled by demand in periods of 5-7 days around new moon. Proposals should
specify the associated diagnostics required: the incoherent scatter radar (ISR), active and passive optical instruments and others. Proposals should be submitted via online at
<a href="http://www.naic.edu/~astro/proposals/hfprop.php">http://www.naic.edu/~astro/proposals/hfprop.php</a> before September 28, 2017 (21:00UT). Information about observing proposals and policies can be found at
<a href="http://www.naic.edu/~astro/proposals/proposal.shtml">http://www.naic.edu/~astro/proposals/proposal.shtml</a><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">Technical information about our facilities and instrumentation as well as the contacts for specific support are found below. For any further information not addressed in this communication, contact Eliana
Nossa (<a href="mailto:enossa@naic.edu)">enossa@naic.edu)</a><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">Best regards,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> <o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">Eliana Nossa<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<span style="font-size:11.0pt;font-family:Calibri;mso-fareast-language:EN-US"><br clear="all" style="page-break-before:always">
</span>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span style="font-size:11.0pt">1. Technical information.</span></b><span style="font-size:11.0pt"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> <o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:23.0pt;text-indent:-23.0pt;mso-list:l0 level2 lfo1">
<![if !supportLists]><b><span style="font-size:11.0pt"><span style="mso-list:Ignore">1.1.<span style="font:7.0pt "Times New Roman"">
</span></span></span></b><![endif]><b><span style="font-size:11.0pt">HF facility.<o:p></o:p></span></b></p>
<p class="MsoNormal"><span style="font-size:11.0pt">The HF facility at Arecibo transmits a maximum of 600KW at 5.1MHz, with 22 dB of gain and 13 deg. of half power beam width, or 8.175MHz with almost 26dB and 8.5 deg. The HF transmission has a Cassegrain design
where the primary is the 300 m Arecibo dish, the secondary is a sub-reflector mesh that reflects frequencies lower than 20MHz, and the feed system is composed of an array of three concentric cross dipole antennas at each frequency. The transmitters are connected
to the antenna arrays by coaxial lines. The delay between the generated and the transmitted signal is 3ns. Manual control of the power gain allows ramping up and down the individual antenna power in dB steps. Configurations using CW and pulses as short as
few seconds are mostly used. The system supports linear, O and X modes.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">For further information, contact Eliana Nossa (<a href="mailto:enossa@naic.edu">enossa@naic.edu</a>).<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> <o:p></o:p></span></p>
<p class="MsoNormal"><b><span style="font-size:11.0pt">1.2. 430 MHz Incoherent Scatter Radar.</span></b><span style="font-size:11.0pt"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">The 430 MHz Incoherent Scatter Radar (ISR) is capable of extremely sensitive diagnostics for HF experiments. It can run in parallel with the HF system, being one of the essential tools for diagnostics of the
ionosphere modification over Arecibo. Power from the pulsed transmitter (currently about 1.3 to 1.5 MW) can be split with an arbitrary ratio into two beams, allowing sensing through the center of the modified region simultaneously with sensing outside of it
or near its edge. Possible geometries are set by the locations of the two feeds on opposite sides of the rotatable azimuth arm, with the minimum zenith angle differences established by the physical sizes of the feeds. Raw data can be collected with a 25 MHz
wide data taking system for later analysis while a narrower bandwidth system is used to provide online monitoring. The current coding technique allows 300 m range resolution on the enhanced plasma line while ion line and natural plasma line data are also recorded
from the same radar pulses. For further information, contact Michael Sulzer (<a href="mailto:msulzer@naic.edu">msulzer@naic.edu</a>).<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> <o:p></o:p></span></p>
<p class="MsoNormal"><b><span style="font-size:11.0pt">1.3. Active optical capability.</span></b><span style="font-size:11.0pt"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> <o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">The "active" optical instruments (lidars) have the capability to monitor the upper stratosphere to lower thermosphere. The lidar beams are collocated with the ISR volume. We have three systems, two of which
are configurable to observe one each of the meteoric metals: Na, Fe, Ca, or Ca+. Alternatively, one of the two metal lidars can be configured as a Rayleigh lidar to measure temperature from the upper stratosphere to the mesosphere, from about 35 to 70 km.
The third lidar is a Doppler-resonance lidar that measures temperatures within the metal layer by sensing the Doppler broadening in the D1 resonance line of K.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> <o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">Request for active optical instrument support for HF experiments must be included in the proposal. We encourage the PIs to contact our staff for particular optical configurations and further information. For
lidar observations, contact Shikha Raizada (<a href="mailto:shikha@naic.edu">shikha@naic.edu</a>), Jens Lautenbach (<u>jlautenbach@naic.edu</u>), or Jonathan Friedman (<a href="mailto:jonathan@naic.edu">jonathan@naic.edu</a>).<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> <o:p></o:p></span></p>
<p class="MsoNormal"><b><span style="font-size:11.0pt">1.4. Passive optical instrumentation and Arecibo Observatory Remote Optical Facility (AO-ROF).</span></b><span style="font-size:11.0pt"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> <o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">At Arecibo, we have a variety of airglow instrumentation. Presently, airglow sensing equipment includes an Ebert-Fastie Spectrometer (OH and O<sub>2
</sub>bands); two Tilting-Filter Photometers (630.0 nm and 555.7 nm); three Fabry-Perot Interferometers (630.00 nm, 557.7 nm and 844.6 nm), and an All-sky Imager system (630.0 nm and 643.4 nm filters).<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">The AO-ROF is located on Culebra Island (18 18' 18"N; 65 18' 05"W), Puerto Rico, about 96 miles east of the Arecibo Observatory. The optical instruments at ROF can observe the same thermospheric volume over
AO sampled by the Incoherent Scatter Radar (ISR). This capability is especially relevant during the HF campaigns. The ROF is designed to host two optical instruments requiring large domes (5-ft diameter) and four optical instruments that require smaller domes
(1-ft diameter). Exterior space is also available for the installation of radio receivers or other kinds of instrumentation.
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">Presently, ROF hosts an all sky imager system (with filters to observe 630.0nm, 643.4nm and 557.7nm airglow emissions) and a High Frequency receiver. From September, 2017, an all sky imager system for OH bands
will be available. Space can be provided for users to deploy instruments temporarily during the HF campaigns. For further information, contact Pedrina Santos (<a href="mailto:pterra@naic.edu">pterra@naic.edu</a>).<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> <o:p></o:p></span></p>
<p class="MsoNormal"><b><span style="font-size:11.0pt">2. Ionospheric Prediction.</span></b><span style="font-size:11.0pt"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">For every campaign, the SAS department will be providing the F2 peak parameters prediction to help the users to define the best way to conduct their experiments. These predictions will be accessible on our
website at least a month before every campaign. The predictions will provide different scenarios depending on the solar activity, historical ionosonde, and ISR registers. For further information, contact Christiano Brum (<a href="mailto:cbrum@naic.edu">cbrum@naic.edu</a>).<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Times New Roman";color:#4472C4"><o:p> </o:p></span></p>
<div>
<p class="MsoNormal"><span style="font-family:"Times New Roman";color:#4472C4">------<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Times New Roman";color:#4472C4">Eliana Nossa, Ph.D.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Times New Roman";color:#4472C4">Research Associate<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Times New Roman";color:#4472C4">Space and Atmospheric Sciences <o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Times New Roman";color:#4472C4">Arecibo Observatory<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Times New Roman";color:#4472C4"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Times New Roman";color:#4472C4">Advanced Technology & Systems Division<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="PT-BR" style="font-family:"Times New Roman";color:#4472C4">SRI International<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Times New Roman";color:#4472C4"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="PT-BR" style="font-family:"Times New Roman";color:#4472C4">HC3 BOX 53995, Arecibo PR 00612 </span><span style="font-family:"Times New Roman";color:#4472C4"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Times New Roman";color:#4472C4">(787) 878 2612 ext 219<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Times New Roman";color:#4472C4"><a href="mailto:eliana.nossa@sri.com"><span style="color:#4472C4">eliana.nossa@sri.com</span></a><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Times New Roman";color:#4472C4"><a href="mailto:enossa@naic.edu"><span style="color:#4472C4">enossa@naic.edu</span></a><o:p></o:p></span></p>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
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