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<p class="MsoNormal" style="margin-bottom:6.0pt"><b><span style="font-family:"Arial",sans-serif">Arecibo Call for Proposals (ISR Observations): Thursday, September 5, 2019 Deadline</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif">Dear Colleagues</span><span style="font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif">(Please distribute this call to any colleagues who might be interested)</span><span style="font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif">We extend an invitation for proposals for the use of the 430MHz Incoherent Scatter Radar with a deadline for September 5, 2019 (17:00 AST, 21:00 UTC). These petitions should be for the usage
of the Incoherent Scatter Radar, as well for the passive and active optical instruments. Once the request is submitted and accepted, the same would be valid for six-month beginning January 1, 2020 (or a year depending on the request), after which it will need
to be re-submitted to maintain validity. </span><i><span style="font-size:14.0pt">This call does
<strong>NOT</strong> include proposals for use of the HF Facility for ionospheric modification</span></i><span style="font-family:"Arial",sans-serif">.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif">Information about observing proposals and policies can be found at
<a href="http://www.naic.edu/~astro/proposals/proposal.shtml">http://www.naic.edu/ao/scientist-user-portal/proposal-submission-system/policies-and-guidelines</a>. Proposals must be submitted using the web-based cover form, which can be found online at
<u><span style="color:blue">http://www.naic.edu/ao/scientist-user-portal/proposal-submission-system/call-for-proposals</span></u>. For this deadline we have enabled direct uploading of the PDF containing the main body of your proposal via the proposal website.
If you do not upload your PDF, you should send it by separate email to <a href="mailto:proposal@naic.edu">
proposal@naic.edu</a>.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif">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 you
can contact Christiano Brum (</span><a href="mailto:cbrum@naic.edu"><span style="font-family:"Arial",sans-serif">cbrum@naic.edu</span></a><span style="font-family:"Arial",sans-serif">).</span><span style="font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif">We hope to obtain your proposals real soon and continue to do outstanding research during the upcoming year as we have done in the past.</span><span style="font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif">Sincerely,</span><span style="font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif">Christiano G M Brum</span><span style="font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif">Deputy Director of Science Operations - Arecibo Observatory
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif">University Of Central Florida (UCF)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:12.0pt;margin-right:0in;margin-bottom:12.0pt;margin-left:0in">
<b><span style="font-family:"Arial",sans-serif">Technical information.</span></b><span style="font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span style="font-family:"Arial",sans-serif">The 430 MHz Incoherent Scatter Radar.<o:p></o:p></span></b></p>
<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif">The 430 MHz Incoherent Scatter Radar (ISR) is capable of extremely sensitive diagnostics of the ionosphere. Power from the pulsed 2.5 MW (about 1.3 to 1.5 MW) transmitter can be split with arbitrary
ratio into two beams, allowing sensing through the observing region simultaneously with sensing outside of it or near its edge (<span style="color:red">Note: Currently, due to the damages caused by the Hurricane Maria, we are running only one beam</span>).
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 set 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 on line 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. There are some restrictions in simultaneous viewing resulting from the extremely high signal power in the enhanced plasma line. For further information you can contact Michael Sulzer (</span><a href="mailto:msulzer@naic.edu"><span style="font-family:"Arial",sans-serif">msulzer@naic.edu</span></a><span style="font-family:"Arial",sans-serif">)
or Nestor Aponte (</span><a href="mailto:naponte@naic.edu"><span style="font-family:"Arial",sans-serif">naponte@naic.edu</span></a><span style="font-family:"Arial",sans-serif">).<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span style="font-family:"Arial",sans-serif">Optical capabilities.<o:p></o:p></span></b></p>
<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif">At Arecibo we have a variety of airglow (passive) and lidar (active) instrumentation. Presently, airglow sensing equipment includes two Tilting-Filter Photometers, two Fabry-Perot Interferometers,
and All-sky Imagers. These instruments are located about 1000 feet from the center of the incoherent scatter radar and at the Arecibo Observatory Remote Optical Facility (AO-ROF) (96 miles east of the Arecibo Observatory).</span><span style="font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif">The "active" optical instruments (lidars) have the capability to monitor the upper stratosphere to lower thermosphere. We have three systems, two of which are configurable to monitor 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. Request for active optical instrument support for ISR experiments must be included in the proposal. We encourage the PIs to contact our
staff for special optical configurations and further information: Shikha Raizada (</span><a href="mailto:shikha@naic.edu"><span style="font-family:"Arial",sans-serif">shikha@naic.edu</span></a><span style="font-family:"Arial",sans-serif">) or Jens Lautenbach
(</span><a href="mailto:jlautenbach@naic.edu"><span style="font-family:"Arial",sans-serif">jlautenbach@naic.edu</span></a><span style="font-family:"Arial",sans-serif">).</span><span style="font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif">The AO-ROF is located on Culebra Island (18<sup>o</sup> 18' 18"N; 65<sup>o</sup> 18' 05"W), Puerto Rico, The design of the facility enables it 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. Request for passive optical instrument support for ISR
experiments also must be included in the proposal. For further information you can contact Pedrina Santos (</span><a href="mailto:pterra@naic.edu"><span style="font-family:"Arial",sans-serif">pterra@naic.edu</span></a><span style="font-family:"Arial",sans-serif">).</span><span style="font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span style="font-family:"Arial",sans-serif">Passive Radio instrumentation<o:p></o:p></span></b></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif">Request for passive radio instrument support is also available. AO has a cluster of passive radio instrumentation, which includes GPS receivers, HF receivers, Lightning detector, VLF receivers,
ionosonde and riometer. Part of this equipment belongs to our users. For further information, please contact Christiano Brum (</span><a href="mailto:cbrum@naic.edu"><span style="font-family:"Arial",sans-serif">cbrum@naic.edu</span></a><span style="font-family:"Arial",sans-serif">)</span><span style="font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p> </o:p></span></p>
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