[asapmembers] REMINDER, Nov. 18th 12 pm ET: ASAP Lecture/Discussion "Solar Wind and Space Weather Studies at Arecibo Observatory"

Tue Nov 16 15:36:00 UTC 2021

Dear Colleagues,
	Please save the date—
		Lecture/Discussion: Thurs., 18th November, 12 noon ET
		Solar Wind and Space Weather Studies at Arecibo Observatory
		Prof. P. K. Manoharan, Senior Observatory Scientist At Arecibo
			(link for a fuller biography <https://www.naic.edu/ao/scientist-user-portal/profile?id=11>)
		Please see the zoom link below.

Abstract:
The talk will discuss the significance of the interplanetary scintillation
(IPS) observations made with the 305-m Arecibo Telescope in the
frequency range of 300 – 3000 MHz. Results of this study emphasize the
importance of IPS measurements with a highly sensitive Arecibo-like
radio telescope in understanding properties of the solar wind in its
acceleration region and evolution of earth-directed space weather
events (e.g., coronal mass ejections) in the Sun-Earth distance. I
will also present an overview of the recently installed Callisto solar
radio spectrometer at the Arecibo Observatory and discuss some of the
interesting solar bursts detected with it.

This event is a further in the series of ASAP “lunchtime” talks/discussions exploring issues and proposals pertinent 
to Arecibo’s future.  Recordings of the earlier talks can be found on the areciboscience.org <http://areciboscience.org/> website.

	Please reserve the date, and note the zoom link below.
		Best regards and wishes,
			ASAP Secretary

Also, please mark your calendar for— 	
	Lecture/Discussion: Thurs., 9th December, 12 noon ET
	REFLECTARRAYS 101: A NON-EXPERT REVIEW AND POTENTIAL APPLICATIONS FOR THE NEW AO FACILITY
	Prof. Luca Olmi, Arcetri Astrophysical Observatory and UPR, Rio Piedras
			(A fuller biography is given below)

	Abstract:  Since the revolutionary breakthrough of printed antenna technology, microstrip reflectarrays 
	have emerged as a new generation of high-gain antennas, combining many favorable features of both 
	reflectors and printed arrays as well as offering an alternative design with low-mass and low-cost features.  
	The aperture of a reflectarray antenna consists of elements arranged in a certain grid that are designed 
	to collimate the main beam of the antenna by controlling the phase of the reflected wave. A prominent 
	advantage of reflectarrays over reflectors is the direct phase control over every element on the aperture, 
	which allows shaped-beam or multibeam performance to be realized easily at no additional cost. Thus, 
	due to its hybrid nature, the reflectarray antenna provides advantages over reflectors and phased-arrays. 
	Despite all the above mentioned benefits, reflectarrays are usually characterized by narrow operating 
	bandwidths, caused by the intrinsic narrow-band of microstrip radiators and the differential spatial phase 
	delays from the feed to the reflecting elements. Improved bandwidths up to 19% have been demonstrated 
	in several designs, but most existing active configurations are characterized by few percent bandwidths. 
	In my talk I will review the main operating features of reflectarrays and will suggest some of their potential 
	areas of application in view of the design of the new AO facility.

> Topic: ASAP Lunch Talk: Solar Wind and Space Weather Studies at Arecibo Observatory
> Time: Nov 18, 2021 Noon Eastern Time (US and Canada)
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Luca Olmi was born in Florence, Italy, in 1961. He received 
the Physics degree and the Ph.D. in Astronomy from the University 
of Florence in 1987 and 1992, respectively.
From 1993 to 1996 he was a Cornell University Research Associate
with the Arecibo Observatory in Puerto Rico. From 1996 to 2001 he
was a Senior Research Associate with the Astronomy Department 
of the University of Massachusetts at Amherst, where he worked on
the Large Millimeter Telescope (LMT). From 1999 to
2010 he was part of the international collaboration BLAST
(Balloon-borne Large Aperture Sub-millimeter Telescope). 
Since 2001 he has been an Astronomer and Technologist with
the “Istituto Nazionale di Astrofisica” (INAF) in Italy, at
the Arcetri Astrophysical Observatory. From 2005 to 2017 he also
jointly held a faculty position at the University of Puerto Rico, 
Rio Piedras campus. 
His research interests include the observation and analysis of 
molecular clouds and star forming regions, the effects of the 
atmosphere on radio astronomical observations, optical and EM 
design applied to radio telescopes and associated instrumentation, 
novel instrumentation design for radio telescopes.

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