<div dir="ltr"><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr"><br></div><br><br><div style="word-wrap:break-word;line-break:after-white-space"><div style="word-wrap:break-word;line-break:after-white-space"><div dir="auto" style="word-wrap:break-word;line-break:after-white-space"><div style="word-wrap:break-word;line-break:after-white-space"><div style="word-wrap:break-word;line-break:after-white-space"><div style="word-wrap:break-word;line-break:after-white-space"><div style="word-wrap:break-word;line-break:after-white-space"><div style="word-wrap:break-word;line-break:after-white-space"><div dir="auto" style="word-wrap:break-word;line-break:after-white-space"><div style="word-wrap:break-word;line-break:after-white-space"><div style="word-wrap:break-word;line-break:after-white-space"><div style="word-wrap:break-word;line-break:after-white-space"><div style="word-wrap:break-word;line-break:after-white-space"><div style="word-wrap:break-word;line-break:after-white-space"><div style="word-wrap:break-word;line-break:after-white-space"><div style="word-wrap:break-word;line-break:after-white-space"><div style="word-wrap:break-word;line-break:after-white-space"><div style="word-wrap:break-word;line-break:after-white-space"><div style="word-wrap:break-word;line-break:after-white-space"><div style="word-wrap:break-word;line-break:after-white-space"><div dir="auto" style="word-wrap:break-word;line-break:after-white-space"><div style="word-wrap:break-word;line-break:after-white-space"><div style="word-wrap:break-word;line-break:after-white-space"><div style="word-wrap:break-word;line-break:after-white-space"><div style="word-wrap:break-word;line-break:after-white-space"><div dir="auto" style="word-wrap:break-word;line-break:after-white-space"><div style="word-wrap:break-word;line-break:after-white-space"><div class="gmail_quote"><img id="m_5260307133307892977m_117241773654800469gmail-m_8812838433700971889gmail-m_-29999260328924249078267ABD-88B1-4B63-A122-E405EAF0DB6F" src="cid:181d53e5672f0a0707e1"><br><br><br><br><span><br><span style="font-size:14px">Dear Colleagues,</span><br style="font-size:12px"><div><div style="font-size:12px"><div class="gmail_quote"><span style="font-size:14px"><span style="white-space:pre-wrap"> </span></span><span style="font-size:14px">Lecture/Discussion: Thurs., 7th July, 12 noon ET</span></div><div class="gmail_quote"><span style="font-size:14px"><span style="white-space:pre-wrap"> </span>Title: <i>A Preliminary Plan to Quickly Restore Utility to the Arecibo 305m Telescope</i></span></div><div class="gmail_quote"><span style="font-size:14px"><span style="white-space:pre-wrap"> </span>Dr. Dale Ferguson — US </span><span style="font-size:14px">AFRL and Spaceforce</span></div><div class="gmail_quote"><span style="font-size:14px"><span style="white-space:pre-wrap"> </span>(A fuller biography is given below)</span></div><div class="gmail_quote"><span style="font-size:14px"><span style="white-space:pre-wrap"> </span>Host: Dr. Eliana Nossa</span></div><div class="gmail_quote"><span style="font-size:14px"><span style="white-space:pre-wrap"> </span>Zoom Link: See below</span></div><div class="gmail_quote"><span style="font-size:14px"><div class="gmail_quote" style="font-size:12px"><b style="font-size:14px"><i><span style="white-space:pre-wrap"> </span></i></b></div><div><b style="font-size:14px"><i><br></i></b></div></span></div><div class="gmail_quote"><span style="font-size:14px"> </span></div></div><div class="gmail_quote"><span><span><b style="font-size:14px">Abstract:</b><div><div class="gmail_quote"><span style="font-size:14px"><span><span style="font-weight:bold;white-space:pre-wrap"> </span></span></span><span style="font-size:14px">Since the collapse of the Arecibo 305m telescope platform on Dec. 1, 2020, </span></div><div class="gmail_quote"><span style="font-size:14px">there </span><span style="font-size:14px">has been much discussion of building a new Arecibo telescope or rebuilding </span></div><div class="gmail_quote"><span style="font-size:14px">the</span><span style="font-size:14px"> </span><span style="font-size:14px">facility that was destroyed. In the collapse, the tops of the three platform</span><span style="font-size:14px"> </span><span style="font-size:14px">support </span></div></div><div><span style="font-size:14px">towers were sheared off, and the feed arm fell free from the swinging platform and </span></div><div><span style="font-size:14px">destroyed 25% of the dish. Fortunately, the Control Building, with the computers, </span></div><div><span style="font-size:14px">spectrometers, masers, atomic clocks, 430 MHz Klystrons, etc., was spared. </span></div><div><span style="font-size:14px"><span style="white-space:pre-wrap"> </span>By replacing the main dish support cables and resurfacing with coarse mesh, </span></div><div><span style="font-size:14px">the main dish can be repaired as a reflector for < HF operation. By replacing the </span></div><div><span style="font-size:14px">damaged aluminum panels to make the dish whole again, RF operations at up to </span></div><div><span style="font-size:14px">500 MHz can be resumed. In this presentation, we outline the steps that can be </span></div><div><span style="font-size:14px">taken to restore HF (High Frequency, 3-30 MHz) ionospheric heating, 430 MHz </span></div><div><span style="font-size:14px">ionospheric incoherent scattering radar, passive radio observations of satellite </span></div><div><span style="font-size:14px">arcing and pulsars, and to extend the field of view to 47 degrees from the zenith. </span></div><div><span style="font-size:14px">This would restore and improve much of the utility of the Arecibo dish. Part of this </span></div><div><span style="font-size:14px">plan involves supporting, positioning and pointing novel point feeds from lightweight <br>football-camera-like cables, strung from the rebuilt tower tops. It is believed that </span></div><div><span style="font-size:14px">the </span><span style="font-size:14px">dish may thus become broadly useful long before replacement</span><span style="font-size:14px"> </span><span style="font-size:14px">facilities can be </span></div><div><span style="font-size:14px">engineered and constructed.</span></div><div style="font-size:14px"><span><br></span></div></span></span></div><div class="gmail_quote" style="font-size:12px"><span style="font-size:14px">This event is a further in the series of ASAP “lunchtime” talks/discussions </span><span style="font-size:14px">exploring </span></div><div class="gmail_quote" style="font-size:12px"><span style="font-size:14px">issues </span><span style="font-size:14px">and </span><span style="font-size:14px">proposals pertinent </span><span style="font-size:14px">to Arecibo’s future. Recordings of the earlier talks can </span></div><div class="gmail_quote" style="font-size:12px"><span style="font-size:14px">be found on </span><span style="font-size:14px">the </span><a href="http://areciboscience.org/" style="font-size:14px" target="_blank">areciboscience.org</a><span style="font-size:14px"> website. </span></div><div class="gmail_quote" style="font-size:12px"><span style="font-size:14px"><br></span></div><div class="gmail_quote"><div><div class="gmail_quote" style="font-size:12px"><span style="font-size:14px"><span style="white-space:pre-wrap"> </span></span><span style="font-size:14px">Please reserve the date, and </span><span style="font-size:14px">look for the zoom link just below</span><span style="font-size:14px">.</span></div><div class="gmail_quote" style="font-size:12px"><span style="font-size:14px"><br></span></div><div class="gmail_quote" style="font-size:12px"><span style="font-size:14px"><span style="white-space:pre-wrap"> </span>Best regards and wishes,</span></div><div class="gmail_quote" style="font-size:12px"><span style="font-size:14px;white-space:pre-wrap"> </span><span style="font-size:14px">ASAP Secretary</span></div><div class="gmail_quote" style="font-size:12px"><br></div><div class="gmail_quote"><font color="#5856d6" face="Calibri, sans-serif"><span><br><br><div style="margin:0in;font-size:11pt;color:rgb(0,0,0)"></div><blockquote type="cite"><div style="margin:0in;font-size:11pt;color:rgb(0,0,0)">ASAP Lunch Talk – Dale Ferguson<u></u><u></u></div><div style="margin:0in;font-size:11pt;color:rgb(0,0,0)"><u></u> <u></u></div><div style="margin:0in;font-size:11pt;color:rgb(0,0,0)">Join Zoom Meeting<u></u><u></u></div><div style="margin:0in;font-size:11pt;color:rgb(0,0,0)"><a href="https://arizona.zoom.us/j/82628421760?pwd=_YigsMCoJ8NQRJLNhNnK05v8MHKsDK.1" style="color:rgb(5,99,193)" target="_blank">https://arizona.zoom.us/j/82628421760?pwd=_YigsMCoJ8NQRJLNhNnK05v8MHKsDK.1</a><u></u><u></u></div><div style="margin:0in;font-size:11pt;color:rgb(0,0,0)">Meeting ID: 826 2842 1760<u></u><u></u></div><div style="margin:0in;font-size:11pt;color:rgb(0,0,0)">Password: 691098<u></u><u></u></div><div style="margin:0in;font-size:11pt;color:rgb(0,0,0)"><u></u> <u></u></div><div style="margin:0in;font-size:11pt;color:rgb(0,0,0)">One tap mobile<u></u><u></u></div><div style="margin:0in;font-size:11pt;color:rgb(0,0,0)">+16027530140,,82628421760# US (Phoenix)<u></u><u></u></div><div style="margin:0in;font-size:11pt;color:rgb(0,0,0)">+16699006833,,82628421760# US (San Jose)<u></u><u></u></div><div style="margin:0in;font-size:11pt;color:rgb(0,0,0)"><u></u> <u></u></div><div style="margin:0in;font-size:11pt;color:rgb(0,0,0)">Dial by your location<u></u><u></u></div><div style="margin:0in;font-size:11pt;color:rgb(0,0,0)">+1 602 753 0140 US (Phoenix)<u></u><u></u></div><div style="margin:0in;font-size:11pt;color:rgb(0,0,0)">+1 669 900 6833 US (San Jose)<u></u><u></u></div><div style="margin:0in;font-size:11pt;color:rgb(0,0,0)">+1 253 215 8782 US (Tacoma)<u></u><u></u></div><div style="margin:0in;font-size:11pt;color:rgb(0,0,0)">+1 346 248 7799 US (Houston)<u></u><u></u></div><div style="margin:0in;font-size:11pt;color:rgb(0,0,0)">+1 646 876 9923 US (New York)<u></u><u></u></div><div style="margin:0in;font-size:11pt;color:rgb(0,0,0)">+1 301 715 8592 US (Washington DC)<u></u><u></u></div><div style="margin:0in;font-size:11pt;color:rgb(0,0,0)">+1 312 626 6799 US (Chicago)<u></u><u></u></div><div style="margin:0in;font-size:11pt;color:rgb(0,0,0)">Meeting ID: 826 2842 1760<u></u><u></u></div><div style="margin:0in;font-size:11pt;color:rgb(0,0,0)">Find your local number: <a href="https://arizona.zoom.us/u/kdLiR6b9rr" style="color:rgb(5,99,193)" target="_blank">https://arizona.zoom.us/u/kdLiR6b9rr</a><u></u><u></u></div><div style="margin:0in;font-size:11pt;color:rgb(0,0,0)"><u></u> <u></u></div><div style="margin:0in;font-size:11pt;color:rgb(0,0,0)">Meeting ID: 826 2842 1760<u></u><u></u></div><div style="margin:0in;font-size:11pt;color:rgb(0,0,0)">Password: 691098<u></u><u></u></div></blockquote><div><br></div><br><span style="font-size:14px">Dale C. Ferguson received the Ph.D. degree from The University of Arizona, Tucson, in 1974. </span></span></font></div><div class="gmail_quote"><font color="#5856d6" face="Calibri, sans-serif"><span><span style="font-size:14px">He is currently the Lead for Spacecraft Charging Science and Technology with the Space Vehicles </span></span></font></div><div class="gmail_quote"><font color="#5856d6" face="Calibri, sans-serif"><span><span style="font-size:14px">Division, Air Force Research Laboratory (AFRL), Kirtland Air Force Base, Albuquerque, NM. </span></span></font></div><div class="gmail_quote"><font color="#5856d6" face="Calibri, sans-serif"><span><span style="font-size:14px">From 1978 TO 1981 Dale was a pulsar staff member at Arecibo. Since 1982, he has been </span></span></font></div><div class="gmail_quote"><font color="#5856d6" face="Calibri, sans-serif"><span><span style="font-size:14px">addressing spacecraft charging problems. In 2018-2019, he spent six months in the Arecibo </span></span></font></div><div class="gmail_quote"><font color="#5856d6" face="Calibri, sans-serif"><span><span style="font-size:14px">Observatory developing and deploying an instrument to measure spacecraft charging known </span></span></font></div><div class="gmail_quote"><font color="#5856d6" face="Calibri, sans-serif"><span><span style="font-size:14px">as the AFRL DAGGER Project. The broadband 327 MHz "Point Feed" was located at the focal </span></span></font></div><div class="gmail_quote"><font color="#5856d6" face="Calibri, sans-serif"><span><span style="font-size:14px">surface of the Arecibo dish. <br></span><br><br><br></span></font></div></div></div></div></span></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div>_______________________________________________<br>
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