<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class=""><meta http-equiv="Content-Type" content="text/html; charset=utf-8" class=""><div style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class=""><meta http-equiv="Content-Type" content="text/html; charset=utf-8" class=""><div style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class=""><meta http-equiv="Content-Type" content="text/html; charset=utf-8" class=""><div style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class=""><meta http-equiv="Content-Type" content="text/html; charset=utf-8" class=""><div style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class=""><meta http-equiv="Content-Type" content="text/html; charset=utf-8" class=""><div style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class=""><meta http-equiv="Content-Type" content="text/html; charset=utf-8" class=""><div style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class=""><div dir="auto" style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class=""><div dir="auto" style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class=""><div dir="auto" style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class=""><meta http-equiv="Content-Type" content="text/html; charset=utf-8" class=""><div style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class=""><meta http-equiv="Content-Type" content="text/html; charset=utf-8" class=""><div style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class=""><meta http-equiv="Content-Type" content="text/html; charset=utf-8" class=""><div class="gmail_quote"><img id="gmail-m_8812838433700971889gmail-m_-29999260328924249078267ABD-88B1-4B63-A122-E405EAF0DB6F" apple-inline="yes" class="" src="cid:178c6374661f0a0707e1"><br class=""><br class=""><br class=""><span style="font-size: 14px;" class=""><br class=""><br class=""></span><span style="font-size: 14px;" class="">Dear Colleagues,</span><br class=""><div style="overflow-wrap: break-word;" class="">
<div class="">
<div class="gmail_quote"><span style="font-size:14px" class=""><span class="Apple-tab-span" style="white-space:pre"> </span>Please save the date—</span></div></div><div class="gmail_quote"><span style="font-size:14px" class=""><span class="Apple-tab-span" style="white-space:pre"> </span>Lecture/Discussion: Thurs., 18th November, 12 noon ET</span></div><div class="gmail_quote"><span style="font-size: 14px;" class=""><span class="Apple-tab-span" style="white-space:pre"> </span></span><span style="font-size: 14px;" class=""><i class="">Solar Wind and Space Weather Studies at Arecibo Observatory</i></span></div><div class="gmail_quote"><span style="font-size: 14px;" class=""><span class=""><span class="Apple-tab-span" style="white-space: pre;"> </span>Prof. P. K. Manoharan, Senior Observatory Scientist At Arecibo</span></span></div><div class="gmail_quote"><span style="font-size: 14px;" class=""><span class=""><span class="Apple-tab-span" style="white-space:pre"> </span>(<a href="https://www.naic.edu/ao/scientist-user-portal/profile?id=11" class="">link for a fuller biography</a>)</span></span></div><div class="gmail_quote"><span class="" style="font-size: 14px;"><span class="Apple-tab-span" style="white-space: pre;"> </span>Please see the zoom link below.</span></div><div class="gmail_quote"><span style="font-size: 14px;" class=""> </span></div><div class="gmail_quote"><span class=""><span style="font-size: 14px;" class=""><b class="">Abstract:</b><br class="">The talk will discuss the significance of the interplanetary scintillation<br class="">(IPS) observations made with the 305-m Arecibo Telescope in the<br class="">frequency range of 300 – 3000 MHz. Results of this study emphasize the<br class="">importance of IPS measurements with a highly sensitive Arecibo-like<br class="">radio telescope in understanding properties of the solar wind in its<br class="">acceleration region and evolution of earth-directed space weather<br class="">events (e.g., coronal mass ejections) in the Sun-Earth distance. I<br class="">will also present an overview of the recently installed Callisto solar<br class="">radio spectrometer at the Arecibo Observatory and discuss some of the<br class="">interesting solar bursts detected with it.</span></span></div><div class="gmail_quote"><span style="font-size: 14px;" class=""><br class=""></span></div><div class="gmail_quote"><span style="font-size: 14px;" class="">This event is a further in the series of ASAP “lunchtime” talks/discussions </span><span class="" style="font-size: 14px;">exploring issues </span><span class="" style="font-size: 14px;">and </span><span class="" style="font-size: 14px;">proposals pertinent </span></div><div class="gmail_quote"><span class="" style="font-size: 14px;">to Arecibo’s future. Recordings of the earlier talks can be found on the <a href="http://areciboscience.org/" class="">areciboscience.org</a> website.</span></div><div class="gmail_quote"><span class="" style="font-size: 14px;"><br class=""></span></div><div class="gmail_quote"><span class="" style="font-size: 14px;"><span class="Apple-tab-span" style="white-space: pre;"> </span></span><span class="" style="font-size: 14px;">Please reserve the date, and note the</span><span class="" style="font-size: 14px;"> zoom link below</span><span class="" style="font-size: 14px;">.</span></div><div class="gmail_quote"><span class="" style="font-size: 14px;"><span class="Apple-tab-span" style="white-space: pre;"> </span>Best regards and wishes,</span></div><div class="gmail_quote"><span class="Apple-tab-span" style="font-size: 14px; white-space: pre;"> </span><span class="" style="font-size: 14px;">ASAP Secretary</span></div><div class="gmail_quote"><br class=""></div><div class="gmail_quote"><br class=""></div><div class="gmail_quote"><div class="gmail_quote"><span class="" style="font-size: 14px;"><br class=""></span></div><div class="gmail_quote"><span class="" style="font-size: 14px;"><i class="">Also, please mark your calendar for— </i><span class="Apple-tab-span" style="white-space:pre"> </span></span></div><div class="gmail_quote"><span style="font-size: 14px;" class=""><span class="Apple-tab-span" style="white-space:pre"> </span>Lecture/Discussion: Thurs., 9th December, 12 noon ET</span></div></div><div class="gmail_quote"><span style="font-size: 14px;" class=""><span class="Apple-tab-span" style="white-space:pre"> </span>REFLECTARRAYS 101: A NON-EXPERT REVIEW AND POTENTIAL APPLICATIONS FOR THE NEW AO FACILITY</span></div><div class="gmail_quote"><span style="font-size: 14px;" class=""><span class="Apple-tab-span" style="white-space:pre"> </span>Prof. Luca Olmi, </span><span style="font-size: 14px;" class="">Arcetri Astrophysical Observatory and UPR, Rio Piedras</span></div><div class="gmail_quote"><span style="font-size: 14px;" class=""><span class="Apple-tab-span" style="white-space:pre"> </span>(A fuller biography is given below)</span></div><div class="gmail_quote"><br class=""></div><div class="gmail_quote"><span class=""><span class="" style="font-size: 14px;"><span class="Apple-tab-span" style="font-weight: bold; white-space: pre;"> </span>Abstract: </span><span style="font-size: 14px;" class="">Since the revolutionary breakthrough of printed antenna technology, microstrip reflectarrays </span></span></div><span style="font-size: 14px;" class=""><span class="Apple-tab-span" style="white-space:pre"> </span>have emerged as a new generation of high-gain antennas, combining many favorable features of both </span></div><div style="overflow-wrap: break-word;" class=""><span style="font-size: 14px;" class=""><span class="Apple-tab-span" style="white-space:pre"> </span>reflectors and printed arrays as well as offering an alternative design with low-mass and low-cost features. </span></div><div style="overflow-wrap: break-word;" class=""><span style="font-size: 14px;" class=""><span class="Apple-tab-span" style="white-space:pre"> </span>The aperture of a reflectarray antenna consists of elements arranged in a certain grid that are designed </span></div><div style="overflow-wrap: break-word;" class=""><span style="font-size: 14px;" class=""><span class="Apple-tab-span" style="white-space:pre"> </span>to collimate the main beam of the antenna by controlling the phase of the reflected wave. A prominent </span></div><div style="overflow-wrap: break-word;" class=""><span style="font-size: 14px;" class=""><span class="Apple-tab-span" style="white-space:pre"> </span>advantage of reflectarrays over reflectors is the direct phase control over every element on the aperture, </span></div><div style="overflow-wrap: break-word;" class=""><span style="font-size: 14px;" class=""><span class="Apple-tab-span" style="white-space:pre"> </span>which allows shaped-beam or multibeam performance to be realized easily at no additional cost. Thus, </span></div><div style="overflow-wrap: break-word;" class=""><span style="font-size: 14px;" class=""><span class="Apple-tab-span" style="white-space:pre"> </span>due to its hybrid nature, the reflectarray antenna provides advantages over reflectors and phased-arrays. </span></div><div style="overflow-wrap: break-word;" class=""><span style="font-size: 14px;" class=""><span class="Apple-tab-span" style="white-space:pre"> </span>Despite all the above mentioned benefits, reflectarrays are usually characterized by narrow operating </span></div><div style="overflow-wrap: break-word;" class=""><span style="font-size: 14px;" class=""><span class="Apple-tab-span" style="white-space:pre"> </span>bandwidths, caused by the intrinsic narrow-band of microstrip radiators and the differential spatial phase </span></div><div style="overflow-wrap: break-word;" class=""><span style="font-size: 14px;" class=""><span class="Apple-tab-span" style="white-space:pre"> </span>delays from the feed to the reflecting elements. Improved bandwidths up to 19% have been demonstrated </span></div><div style="overflow-wrap: break-word;" class=""><span style="font-size: 14px;" class=""><span class="Apple-tab-span" style="white-space:pre"> </span>in several designs, but most existing active configurations are characterized by few percent bandwidths. </span></div><div style="overflow-wrap: break-word;" class=""><span style="font-size: 14px;" class=""><span class="Apple-tab-span" style="white-space:pre"> </span>In my talk I will review the main operating features of reflectarrays and will suggest some of their potential </span></div><div style="overflow-wrap: break-word;" class=""><span style="font-size: 14px;" class=""><span class="Apple-tab-span" style="white-space:pre"> </span>areas of application in view of the design of the new AO facility.</span><div class="gmail_quote"><br class=""></div><span class=""><div style="overflow-wrap: break-word;" class=""><span class=""><br class=""></span></div><div style="overflow-wrap: break-word;" class=""><span class=""><br class=""></span></div><br class=""><span style="font-size: 14px;" class=""></span><blockquote type="cite" class=""><span style="font-size: 14px;" class="">Topic: ASAP Lunch Talk: Solar Wind and Space Weather Studies at Arecibo Observatory<br class="">Time: Nov 18, 2021 Noon Eastern Time (US and Canada)<br class=""><br class="">Join Zoom Meeting<br class=""><a href="https://arizona.zoom.us/j/83133196983?pwd=U3FtRmh4UTJ5S2FGNGdRc01rZUNzUT09" class="">https://arizona.zoom.us/j/83133196983?pwd=U3FtRmh4UTJ5S2FGNGdRc01rZUNzUT09</a><br class=""><br class="">Password: 377274<br class=""><br class="">One tap mobile<br class="">+16027530140,,83133196983# US (Phoenix)<br class="">+12532158782,,83133196983# US (Tacoma)<br class=""><br class="">Dial by your location<br class=""> +1 602 753 0140 US (Phoenix)<br class=""> +1 253 215 8782 US (Tacoma)<br class=""> +1 346 248 7799 US (Houston)<br class=""> +1 669 900 6833 US (San Jose)<br class=""> +1 301 715 8592 US (Washington DC)<br class=""> +1 312 626 6799 US (Chicago)<br class=""> +1 646 876 9923 US (New York)<br class="">Meeting ID: 831 3319 6983<br class="">Find your local number: https://arizona.zoom.us/u/kj3cGxIr<br class=""><br class="">Join by SIP<br class="">83133196983@zoomcrc.com<br class=""><br class="">Join by H.323<br class="">162.255.37.11 (US West)<br class="">162.255.36.11 (US East)<br class="">115.114.131.7 (India Mumbai)<br class="">115.114.115.7 (India Hyderabad)<br class="">213.19.144.110 (Amsterdam Netherlands)<br class="">213.244.140.110 (Germany)<br class="">103.122.166.55 (Australia Sydney)<br class="">103.122.167.55 (Australia Melbourne)<br class="">149.137.40.110 (Singapore)<br class="">64.211.144.160 (Brazil)<br class="">149.137.68.253 (Mexico)<br class="">69.174.57.160 (Canada Toronto)<br class="">65.39.152.160 (Canada Vancouver)<br class="">207.226.132.110 (Japan Tokyo)<br class="">149.137.24.110 (Japan Osaka)<br class="">Meeting ID: 831 3319 6983<br class="">Password: 377274 </span><br class=""></blockquote><br class=""></span>
</div><div style="overflow-wrap: break-word;" class=""><span class="" style="font-size: 14px;"><b class="">Luca Olmi</b> was born in Florence, Italy, in 1961. He received <br class="">the Physics degree and the Ph.D. in Astronomy from the University <br class="">of Florence in 1987 and 1992, respectively.<br class="">From 1993 to 1996 he was a Cornell University Research Associate<br class="">with the Arecibo Observatory in Puerto Rico. From 1996 to 2001 he<br class="">was a Senior Research Associate with the Astronomy Department <br class="">of the University of Massachusetts at Amherst, where he worked on<br class="">the Large Millimeter Telescope (LMT). From 1999 to<br class="">2010 he was part of the international collaboration BLAST<br class="">(Balloon-borne Large Aperture Sub-millimeter Telescope). <br class="">Since 2001 he has been an Astronomer and Technologist with<br class="">the “Istituto Nazionale di Astrofisica” (INAF) in Italy, at<br class="">the Arcetri Astrophysical Observatory. From 2005 to 2017 he also<br class="">jointly held a faculty position at the University of Puerto Rico, <br class="">Rio Piedras campus. <br class="">His research interests include the observation and analysis of <br class="">molecular clouds and star forming regions, the effects of the <br class="">atmosphere on radio astronomical observations, optical and EM <br class="">design applied to radio telescopes and associated instrumentation, <br class="">novel instrumentation design for radio telescopes.<br class=""> </span></div></div></div></div><br class=""></div></div></div></div></div></div></div></div></div></body></html>