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DTSTART;TZID=Australia/Sydney:20260624T150000
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DTSTAMP:20260619T070136Z
CREATED:20260619T070135Z
LAST-MODIFIED:20260619T070136Z
UID:19214-1782313200-1782316800@www.atnf.csiro.au
SUMMARY:S&A Colloquium: Hariharan Krishnan (SKAO)
DESCRIPTION:Enabling Next-Generation Solar and Heliospheric Science with SKA-Low Signal Processing\n\nAbstract: \n\nThe Square Kilometre Array-Low (SKA-Low) telescope represents a transformative leap forward for low-frequency radio astronomy. Operating across the 50–350 MHz band with 131\,072 dual-polarization log-periodic dipole antennas grouped into 512 Low-Frequency Aperture Array (LFAA) stations\, the array presents unprecedented digital signal processing challenges. At the heart of this system lies a tightly integrated digital signal chain. Within the Signal Processing Subsystem (SPS)\, broadband analog RF signals from the antenna are digitized at high dynamic range and channelized through a polyphase filterbank producing coarse frequency channels that optimise data transport efficiency for the station beamformer module. The ensemble of station beams are then processed by the Central Signal Processor (CSP) Correlator and Beamformer (CBF) to generate full-polarization visibilities for high-fidelity imaging and narrow\, high-time-resolution tied-array beams. \n\nThis talk provides an overview of how this signal chain architecture interfaces with frontier solar and heliospheric observations. SKA-Low’s dense short-baseline configuration and broad instantaneous bandwidth offer the raw capability for sub-second imaging spectroscopy of impulsive solar radio emission and Coronal Mass Ejections (CMEs)\, alongside high-cadence observations of interplanetary scintillation (IPS) to probe the dynamic solar wind. However\, physical interpretation in this low-frequency regime is intrinsically shaped by propagation effects\, including scattering\, refraction\, and magneto-ionic mode coupling within the coronal plasma. I will outline the direct mapping between the Low telescope digital signal processing capabilities and the science enabled in the solar and heliospheric context\, while highlighting the resulting limits on physical inference. \nJoin Event on Microsoft Teams\nLocation\n\nOrganiser\n\nEvent details\nDownload iCal\nCategory\nColloquia
URL:https://www.atnf.csiro.au/event/sa-colloquium-hariharan-krishnan-skao/
LOCATION:Marsfield Lecture Theatre\, 26 Pembroke Road\, Marsfield\, NSW\, 2122\, Australia
CATEGORIES:Colloquia
ORGANIZER;CN="Jishnu Thekkeppattu":MAILTO:Jishnunambissan.Thekkeppattu@csiro.au
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DTSTART;TZID=Australia/Sydney:20260625T120000
DTEND;TZID=Australia/Sydney:20260625T123000
DTSTAMP:20260622T054158Z
CREATED:20260622T054158Z
LAST-MODIFIED:20260622T054158Z
UID:19230-1782388800-1782390600@www.atnf.csiro.au
SUMMARY:Colearnium: Rachel Rayner (CSIRO)
DESCRIPTION:How the people hear about the science: a media case study\n\nThis week Rachel Rayner will tell us about “How the people hear about the science: a media case study“. \n\n \n\n \n\n\n\nPlease let me know if you’re willing to present at a future co-learnium or have requests for specific talks\, thanks! \n\nKind regards\, \n\nStefan Duchesne \n\nTeams meeting link below: \nTeams Meeting\nOrganiser\n\nEvent details\nDownload iCal\nCategory\nColloquia
URL:https://www.atnf.csiro.au/event/colearnium-rachel-rayner-csiro/
LOCATION:NSW
CATEGORIES:Colearnia
ORGANIZER;CN="Stefan Duchesne":MAILTO:Stefan.Duchesne@csiro.au
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DTSTART;TZID=Australia/Sydney:20260701T150000
DTEND;TZID=Australia/Sydney:20260701T160000
DTSTAMP:20260624T021222Z
CREATED:20260624T021222Z
LAST-MODIFIED:20260624T021222Z
UID:19250-1782918000-1782921600@www.atnf.csiro.au
SUMMARY:S&A Colloquium: Macon Magno (Texas A&M University)
DESCRIPTION:A Complete Census of the Properties of Radio-Quiet AGN in the Local Universe: Implications for Black Holes and AGN Feedback\n\nAbstract: \n\nActive Galactic Nuclei (AGN) are among the most energetic objects in the Universe\, powered by accretion onto supermassive black holes. Despite decades of study\, many questions remain about how AGN generate radio emission and interact with their host galaxies. In this talk\, I will present results from three radio studies of nearby AGN. First\, I will discuss the final phase of the largest 22 GHz\, 1” resolution imaging survey of 231 nearby Swift-BAT selected AGN. We find a wide range of radio morphologies and show that the compact radio cores are consistent with coronal emission\, while the extended emission is largely associated with star formation. Next\, I will present radio spectral energy distributions for 100 AGN spanning frequencies from tens of MHz to hundreds of GHz. Using a Bayesian modeling framework\, we find that fewer than half of the sources are well described by a simple power law\, highlighting the complexity of AGN radio emission and the need for broad frequency coverage to uncover the physical processes shaping AGN spectra. Finally\, I will present high-resolution VLA observations of a water maser in the Seyfert 2 galaxy NGC 1106. Rather than originating in the accretion disk\, we localize the maser approximately one kpc from the nucleus\, where it is likely produced by an interaction between an AGN-driven outflow and the surrounding interstellar medium. Together\, these results provide new insights into the origin of radio emission in AGN and the ways in which AGN interact with their host galaxies. \n\nPlease note that this colloquium will be held in the Faraday meeting room  \nJoin Event on Microsoft Teams\nLocation\n\nOrganiser\n\nEvent details\nDownload iCal\nCategory\nColloquia
URL:https://www.atnf.csiro.au/event/sa-colloquium-macon-magno-texas-am-university/
LOCATION:Marsfield Lecture Theatre\, 26 Pembroke Road\, Marsfield\, NSW\, 2122\, Australia
CATEGORIES:Colloquia
ORGANIZER;CN="Jishnu Thekkeppattu":MAILTO:Jishnunambissan.Thekkeppattu@csiro.au
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