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DTSTART;TZID=Australia/Sydney:20231206T150000
DTEND;TZID=Australia/Sydney:20231206T160000
DTSTAMP:20260517T032111
CREATED:20250819T071153Z
LAST-MODIFIED:20250819T071154Z
UID:14953-1701874800-1701878400@www.atnf.csiro.au
SUMMARY:S&A Colloquium: Dipanjan Mitra (NCRA\, TIFR)
DESCRIPTION:Rotating vector model of pulsars\n\nAbstract\n\nMore than Fifty years have passed since the discovery of pulsars\, yet the physical mechanism of their coherent radio emission is unclear. The linear polarization position angle (PPA) tracks observed in normal pulsars (periods > 0.1 sec) can be explained by the rotating vector model (RVM)\, which forms the basis for understanding pulsar coherent radio emission physics. In several pulsars only one RVM like PPA track is seen while in other pulsars two parallel orthogonal tracks are seen\, and this variation can be understood as radiation coming out from the pulsar magnetosphere to mainly consist of extraordinary or ordinary waves polarized perpendicular or parallel to the planes of pulsar dipolar magnetic field. However there also exists an equally large sample of pulsars where the PPA traverses shows a complex non-RVM pattern. This diverse behaviour is in conflict with applying a unique emission mechanism to the pulsar population\, and hence the fundamental question of whether the outgoing waves are excited by maser or curvature radiation (also known as antenna mechanism) had remained unresolved. In this talk I will argue that high quality single pulse polarimetric observations can be used to distinguish the emission mechanism. I will showcase examples of how highly linearly polarized signals can unravel the underlying RVM\, particularly in pulsars with PPAs showing complex patterns. This feature strongly favours the coherent curvature radiation mechanism to be universally applicable in the normal pulsar population. \nWatch recording\nEvent details\nDownload iCal\nCategory\nColloquia
URL:https://www.atnf.csiro.au/event/sa-colloquium-dipanjan-mitra-ncra-tifr/
LOCATION:NSW
CATEGORIES:Colloquia
ATTACH;FMTTYPE=image/jpeg:https://www.atnf.csiro.au/wp-content/uploads/2024/12/Colloq-06122023.jpg
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BEGIN:VEVENT
DTSTART;TZID=Australia/Sydney:20231213T150000
DTEND;TZID=Australia/Sydney:20231213T160000
DTSTAMP:20260517T032111
CREATED:20250819T071111Z
LAST-MODIFIED:20250819T071112Z
UID:14954-1702479600-1702483200@www.atnf.csiro.au
SUMMARY:S&A Colloquium: Ron Ekers (CSIRO)
DESCRIPTION:History of radio astronomy\n\nAbstract\n\nIt was 90 years ago when Karl Jansky announced his discovery of radio noise from the Milky Way Galaxy at the April 1933 meeting of URSI in Washington and Radio Astronomy was born. I was asked to give a General Lecture on the entire history of radio astronomy at the URSI General Assembly in Sapporo\, Japan on 23 Aug 2023. I will give a slightly abbreviated version of this lecture as a S&A colloquium. \n\n Instead of just presenting a historical review of all the discoveries I will explore some of the circumstances leading up to the discoveries\, including some stories not generally known\, but which provide the background and context. These details are often excised from the standard scientific narrative but are essential to understand the roles played by serendipity\, prediction\, and technology. There is “nothing fortuitous” in so-called serendipitous discoveries. As Pasteur famously quoted “In the field of observation\, chance favors only the prepared mind.” \n\n While many discoveries are serendipitous\, they depend on the development of new technology. So\, it is the telescopes\, the instruments connected to the telescopes\, and the data analysis that leads to most new discoveries. The scientific discoveries for which facilities become famous are rarely those predicted from the science goals for which the telescopes were built. Building the next generation of radio telescopes to continue our 90 years of innovation and discovery will set new challenges. \nWatch recording\nEvent details\nDownload iCal\nCategory\nColloquia
URL:https://www.atnf.csiro.au/event/sa-colloquium-ron-ekers-csiro/
LOCATION:NSW
CATEGORIES:Colloquia
ATTACH;FMTTYPE=image/jpeg:https://www.atnf.csiro.au/wp-content/uploads/2024/12/Colloq-13122023.jpg
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DTSTART;TZID=Australia/Sydney:20231220T150000
DTEND;TZID=Australia/Sydney:20231220T160000
DTSTAMP:20260517T032111
CREATED:20250819T071043Z
LAST-MODIFIED:20250819T071044Z
UID:14955-1703084400-1703088000@www.atnf.csiro.au
SUMMARY:S&A Colloquium: Joe Callingham (ASTRON/Leiden University)
DESCRIPTION:Radio stars and Exoplanets\n\nAbstract\n\nOne key question that astronomy is attempting to answer is whether there are habitable planets around stars other than our Sun. While we have entered an era where identifying nearby exoplanets has become standard\, discerning whether the environmental conditions dictated by the host stars are suitable for life has proved far more elusive. The detection of low-frequency radio emission from an M dwarf or an exoplanet provides a direct probe of extrasolar space weather and the planet’s magnetic field – information crucial for assessing the potential habitability of the planet. In this talk\, I will outline our LOFAR survey of stellar systems\, with a focus on our recent detection of strong\, highly circularly polarised low-frequency radio emission associated with nearby stars – the expected signpost of star-exoplanet interactions. I will discuss how our survey represents the most comprehensive observations of stellar systems at low frequencies\, and the implications of this new population in understanding the magnetosphere of M dwarfs and exoplanetary magnetic fields. \n\n \nWatch recording\nEvent details\nDownload iCal\nCategory\nColloquia
URL:https://www.atnf.csiro.au/event/sa-colloquium-joe-callingham-astron-leiden-university/
LOCATION:NSW
CATEGORIES:Colloquia
ATTACH;FMTTYPE=image/jpeg:https://www.atnf.csiro.au/wp-content/uploads/2024/12/Colloq-20122023.jpg
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