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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple style='word-wrap:break-word'><div class=WordSection1><div><p class=MsoNormal>ASAP Lunchtime Talk – P.K. Manoran – <span style='color:black'>Senior Observatory Scientist at</span> <span style='color:black'>Arecibo Observatory.</span><o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><span style='font-size:10.5pt;font-family:Helvetica;color:black;letter-spacing:.3pt;background:white'>Thursday 2023 Feb 2,</span><span style='font-size:10.5pt;font-family:Helvetica;color:#232333;letter-spacing:.3pt;background:white'> 12:00 Noon Eastern Time (US and Canada)</span><span style='font-size:10.5pt;font-family:Helvetica;color:black;letter-spacing:.3pt;background:white'>, 17:00 UTC</span><span style='font-size:10.5pt;font-family:Helvetica;color:#232333;letter-spacing:.3pt;background:white'><o:p></o:p></span></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Regular Solar Radio Imaging at Arecibo: Evolution of Active Regions<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Join Zoom Meeting<o:p></o:p></p><p class=MsoNormal><a href="https://arizona.zoom.us/j/83684468790?pwd=L0V4VlhHdHg0MVZjMmJGa0N2SzAxQT09">https://arizona.zoom.us/j/83684468790?pwd=L0V4VlhHdHg0MVZjMmJGa0N2SzAxQT09</a><o:p></o:p></p><p class=MsoNormal>Meeting ID: 836 8446 8790<o:p></o:p></p><p class=MsoNormal>Password: 169236<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Abstract:<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>The sudden release of magnetic energy on the Sun drives powerful solar flares and coronal mass ejections. The key issue is the difficulty in predicting the occurrence time and location of strong solar eruptions, i.e., those leading to high impact space weather disturbances at the near-Earth environment. Regular solar mapping with the Arecibo 12-m radio telescope at X-band (8.1 – 9.2 GHz) has shown the potential for identifying an eruptive region when it rotates close to the central meridian of the Sun, about one half to a day in advance, and predict the strongest flares and coronal mass ejections directed towards the Earth. The X-band images of solar eruptions at mid-chromospheric heights, supported by the Arecibo CALLISTO solar spectrometer in the low-frequency range of 15 – 100 MHz at low-coronal heights, are crucial to studying the initiation processes of solar events.<o:p></o:p></p><p class=MsoNormal>In this talk, I will review results of the evolution of the brightness temperature of active regions in association with the development of magnetic complexity in the period between mid-December 2021 and today. Additionally, the recent discovery of a strong correlation between the X-band peak brightness of an active region and the number of visible sunspots present within it has tremendous potential for understanding the particle acceleration mechanism and additional exciting science.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>-----------<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><span style='color:black'>Brief Bio/CV<o:p></o:p></span></p><p class=MsoNormal><span style='color:black'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:black'>P.K. Manoharan joined the Tata Institute of Fundamental Research<o:p></o:p></span></p><p class=MsoNormal><span style='color:black'>(TIFR) in 1975, immediately after his BSc (Special Physics) at American<o:p></o:p></span></p><p class=MsoNormal><span style='color:black'>College, Madurai, India, and since then has been associated with the Ooty<o:p></o:p></span></p><p class=MsoNormal><span style='color:black'>Radio Telescope. He completed his doctoral studies in 1991 at TIFR, and<o:p></o:p></span></p><p class=MsoNormal><span style='color:black'>then spent one year (1993) as a JSPS Fellow at the Solar–Terrestrial<o:p></o:p></span></p><p class=MsoNormal><span style='color:black'>Environment Laboratory, Japan, one and half years (1995–96) as a<o:p></o:p></span></p><p class=MsoNormal><span style='color:black'>Visiting Fellow at the Observatoire de Paris, Meudon, France, and nearly<o:p></o:p></span></p><p class=MsoNormal><span style='color:black'>two years (2002–03) as a Visiting Scientist at the Goddard Space Flight<o:p></o:p></span></p><p class=MsoNormal><span style='color:black'>Center, NASA, and the University of Maryland, USA. He was an academic<o:p></o:p></span></p><p class=MsoNormal><span style='color:black'>faculty member of TIFR and served both as Professor and Director of the<o:p></o:p></span></p><p class=MsoNormal><span style='color:black'>Ooty Radio Observatory, Radio Astronomy Centre (2004–2018).<o:p></o:p></span></p><p class=MsoNormal><span style='color:black'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:black'>Manoharan served as the Vice–President (2014-2016) of IAU Commission-49<o:p></o:p></span></p><p class=MsoNormal><span style='color:black'>(Interplanetary Plasma and Heliosphere) and was a Member of the IAU<o:p></o:p></span></p><p class=MsoNormal><span style='color:black'>Commission-49 (Interplanetary Plasma and Heliosphere) Organizing<o:p></o:p></span></p><p class=MsoNormal><span style='color:black'>Committee (2009-2014). He was the Secretary (2005–2009) and the<o:p></o:p></span></p><p class=MsoNormal><span style='color:black'>President (2010–2012) of Asia–Oceania Geosciences Society (AOGS),<o:p></o:p></span></p><p class=MsoNormal><span style='color:black'>Solar–Terrestrial Science Section. He served on the Editorial Board of<o:p></o:p></span></p><p class=MsoNormal><span style='color:black'>Geoscience Letters for four years. He currently serves on the Editorial<o:p></o:p></span></p><p class=MsoNormal><span style='color:black'>Boards of the Journal of Space Weather and Space Climate and the Indian<o:p></o:p></span></p><p class=MsoNormal><span style='color:black'>Journal of Radio & Space Physics. He has been a member of the Advisory<o:p></o:p></span></p><p class=MsoNormal><span style='color:black'>Board of the ”Solar Physics” Journal since 2019.<o:p></o:p></span></p><p class=MsoNormal><span style='color:black'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:black'>From October 2019, Manoharan has been a Senior Observatory Scientist at<o:p></o:p></span></p><p class=MsoNormal><span style='color:black'>the Arecibo Observatory. He has initiated heliophysics and space weather<o:p></o:p></span></p><p class=MsoNormal><span style='color:black'>studies with the Arecibo Telescopes.<o:p></o:p></span></p><p class=MsoNormal><span style='color:black'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:black'>Manoharan's research interests include Radio astronomy techniques,<o:p></o:p></span></p><p class=MsoNormal><span style='color:black'>multi-wavelength studies of the eruptive Sun, the physical properties<o:p></o:p></span></p><p class=MsoNormal><span style='color:black'>of the solar wind, space weather events, turbulence, pulsars, etc.<o:p></o:p></span></p><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>Join Zoom Meeting<o:p></o:p></p></div><div><p class=MsoNormal><a href="https://arizona.zoom.us/j/83684468790?pwd=L0V4VlhHdHg0MVZjMmJGa0N2SzAxQT09">https://arizona.zoom.us/j/83684468790?pwd=L0V4VlhHdHg0MVZjMmJGa0N2SzAxQT09</a><o:p></o:p></p></div><p class=MsoNormal>Meeting ID: 836 8446 8790<o:p></o:p></p><p class=MsoNormal>Password: 169236<o:p></o:p></p><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>Dial by your location<o:p></o:p></p></div><div><p class=MsoNormal> +1 602 753 0140 US (Phoenix)<o:p></o:p></p></div><div><p class=MsoNormal> +1 253 215 8782 US (Tacoma)<o:p></o:p></p></div><div><p class=MsoNormal> +1 346 248 7799 US (Houston)<o:p></o:p></p></div><div><p class=MsoNormal> +1 669 900 6833 US (San Jose)<o:p></o:p></p></div><div><p class=MsoNormal> +1 301 715 8592 US (Washington DC)<o:p></o:p></p></div><div><p class=MsoNormal> +1 312 626 6799 US (Chicago)<o:p></o:p></p></div><div><p class=MsoNormal> +1 646 876 9923 US (New York)<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>Find your local number: <a href="https://arizona.zoom.us/u/kMxa2R1hD">https://arizona.zoom.us/u/kMxa2R1hD</a><o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div></div></body></html>