AndreaBozzo/ceres-open-data-index huggingface dataset:
Parkes observations for project P1345 semester 2025APRS_15

This proposal aims to constrain burst rates and spin down properties of a sample of new Rotating Radio Transients (RRATs) discovered with the ASKAP CRAFT Coherent upgrade (CRACO) system. Over the past 12-months of commissioning, CRACO discovered and precisely localised 15 new RRATs, characterised by their sporadic pulses with dispersion measures (DM) consistent with Galactic sources. We request 22.5h of Parkes time split into three 30min observations spanning 6-months for each target. This can help constrain periods and potentially phase-coherent timing solutions given that we already have arcsec-precision interferometric localisations. Our main science goals are: 1) to measure their burst rates, periods, and spin-down properties; 2) to assess their nulling fraction and intermittency; 3) to measure their polarimetric properties and constrain their emission mechanism; 4) to determine if the CRACO RRATs are fundamentally different from the known RRAT population. Some of these goals can be answered even with the detection of a limited number of pulses.

Organization: CSIRO Data Access Portal
Parkes observations for project P1357 semester 2025APRS_06

MeerKAT has already discovered a number of Galactic transients, which are most likely to be Rotating Radio Transients (RRATs). Previous observations of a few of these sources with the Parkes UWL receiver have proven its utility in follow-up timing observations of MeerKAT discoveries.
  MeerKAT has discovered a few more RRATs in its latest observing cycle and more good quality UWL observations of these sources are required to determine the rotational period and period derivative and also to facilitate the study of their emission properties. Therefore, we request follow-up observations of 5 new sources to achieve this and to further enable spectral and polarization studies of these sources. Given the potential link between RRATs, magnetars, and some fast radio bursts (FRBs) suggested by both observations and theories, this study could reveal more similarities between these different classes of transient sources and significantly advance our understanding of their origins.

Organization: CSIRO Data Access Portal
Coupled Coastal Hazard Prediction System (CCHaPS) Hindcast for Australia

CCHaPS, the Coupled Coastal Hazard Prediction System, is a 2D hydrodynamic and wave model (Semi-implicit Cross-scale Hydroscience Integrated System Model and Wind Wave Model III, SCHISM-WWMIII), configured around the Australian coastline including the Great Barrier Reef, and extending out to deep offshore waters or neighbouring landmasses.
The model simulates water levels due to astronomical tides, weather, waves and aspects of wave-flow interaction over multiple decades, allowing for full consideration of the dynamics of extreme sea levels and waves in the Australian region, at high spatial resolution from ~7km off-shore down to ~250m at the coast, and ~100m in major river mouths. The model is run on an unstructured (triangular) grid comprising over 1.4 million nodes, which extends overland up to a 12m elevation contour, to enable modelling of inundation events and sea level rise.
The CCHaPS hindcast covers the 40-year period 1981 to 2020. 
The hindcast is forced with downscaled ERA5 winds and mean sea level pressure produced by BARRA-R2, water levels from ORAS5, tides from TPXOv9.2, and spectral wave forcing from WHACS (see Lineage).
The model used is SCHISM-WWMIII v5.9, using ST4 wave physics, run on NCI's Gadi supercomputer.
The dataset comprises hourly netCDF data on an unstructured grid, compliant with CF, ACDD and UGRID metadata conventions. A notebook demonstrating how to interact with the data will be attached under Supporting Documentation, and also available via GitHub (see Related Links, LINK TBA).
Variables included are: depth (non-time varying), sea surface height, wet-dry node, currents, significant wave height, mean wave direction, peak wave direction, directional spreading, t01 and t02 mean wave period, peak wave period, peak directional spreading, peak direction (rad), and orbital velocity.
The data is also stored on CSIRO infrastructure in the {ev-acs-wp3-cchaps} volume, and at NCI in /g/data/ia39/WP3/release/CCHaPS.
Examples of how to work with the data in Python are provided in the accompanying notebook "CCHaPS_examples.ipynb" (see Supporting files)
A manuscript describing this dataset is in preparation and will be linked to this metadata record in due course.

Organization: CSIRO Data Access Portal
Long-term project observations for project P1321 semester 2025APRS_08

The atomic interstellar medium shows tiny-scale optical depth fluctuations on the scale of 0.1~10,000 AU, whose origin and nature are poorly understood. The existence of this Tiny-Scale Atomic Structure (TSAS) has significant implications, potentially calling into question our fundamental understanding of heating, cooling and dynamical processes in the interstellar medium. Yet observations remain sparse. This long-term project plans to search for temporal variations in HI absorption spectra seen against background pulsars to characterise TSAS in the Milky Way interstellar medium (ISM). These observations constitute the largest number of sightlines and densest temporal sampling ever performed in a single experiment, and will test predictions that TSAS is the tail end of a turbulent cascade, constrain its minimum size scale (down to resolutions of ~0.05 AU) and potentially provide the first direct measurements of pressures in "large" TSAS features of &gt; 1000 AU. We make use of the phase-resolved spectral line mode that we have recently implemented on Parkes, which has cut data rates and processing times by factors of ~1000 compared to past studies. This is an expansion of our pilot P1321 to a long term study.

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Parkes observations for project P595 semester 2025APRS_16

We propose to continue the PULSE@Parkes project in which high school students from Australia and around the World use the Parkes radio telescope in a remote observing model to observe and analyse pulsar data. The data from some PULSE@Parkes observations are used to support the space missions, other observations supplement the P456 Pulsar Timing Array project and the remainder were chosen in order to make a detailed analysis of pulsar timing irregularities and intermittency.

Organization: CSIRO Data Access Portal
Parkes observations for project P1328 semester 2025APRS_15

Fast radio bursts are peculiar micro-millisecond duration transients, which have been seen to be extragalactic in origin. Since their discovery, a dichotomy has emerged in their population. Some FRBs have been seen to be repeating, while others have not been seen to be repeating. The repeating FRBs, such as FRB 20180301A, provide an unparalleled window into their circumburst environment due to their repeating nature, which can be used to constrain possible progenitor models and test underlying emission mechanisms. Additionally, FRB 20180301A has been seen to have interesting polarisation properties, such as a switch in the sign of RM, indicating a reversal in the magnetic field and a marked reduction in the linear polarisation fraction towards lower frequencies (depolarisation). The previous Parkes/Murriyang source follow-up has also revealed a temporal evolution in the dispersion measure (DM) of the source and tentative evidence for correlation in the DM and rotation measure (RM). The ultra-wideband low (UWL) receiver on Parkes/Murriyang is ideally suited to explore the wideband spectro-temporal and polarimetric behaviour of the source. We propose regular monitoring of FRB 20180301A using UWL to model the magnetic field evolution, study its circumburst media using depolarisation behaviour, and constrain any correlation of DM and RM.

Organization: CSIRO Data Access Portal
Parkes observations for project P1219 semester 2025APRS_07

Magnetic fields are fundamental in regulating star formation and the evolution of molecular clouds. Zeeman splitting offers a unique method to directly measure line-of-sight magnetic field strengths in interstellar environments, from the diffuse ISM to dense cores. Observations of HI and OH absorption toward pulsars provide an unprecedented opportunity to measure magnetic fields with high precision, benefiting from pulsars' small angular sizes and reliable Stokes V spectra unaffected by instrumental effects. Our recent tentative Zeeman splitting detections in OH absorption toward PSR J1644-4559 with Parkes reveal magnetic field strengths that suggest magnetically subcritical states, where magnetic pressure counteracts gravity. This challenges conventional theories of subcritical cold neutral medium (CNM) transitioning to supercritical star-forming molecular clouds, emphasizing the need for detailed investigation. We propose a continuation of Zeeman splitting studies through high-sensitivity OH and HI absorption observations of pulsars PSR J1644-4559, J1721-3532, and J1852+0031 using Parkes. By employing an innovative phase-resolved spectral technique and extending integration times, we aim to enhance Zeeman detection sensitivity and study magnetic field transitions in the CNM and quiescent molecular clouds. This work will refine our understanding of subcritical-to-supercritical transitions in star formation, establish pulsar absorption as a robust probe of interstellar magnetic fields, and advance observational techniques critical to star formation studies.

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Parkes observations for project P1325 semester 2025APRS_05

We request 15 hours of observing time with the Parkes UWL receiver (700-4000 MHz) to investigate frequency-dependent eclipsing in three spider millisecond pulsars (MSPs): one redback and two black widows. Spider MSPs commonly exhibit frequency-dependent eclipsing, which provides insights into their dense, magnetized plasma environments. We propose to use the Parkes telescope with the UWL receiver in full polar mode to investigate key properties of three spider MSPs, focusing on their eclipse mechanisms and polarization characteristics. Our goals include modeling the eclipse phase spectra using wideband observations to examine the transition from optically thick to thin regimes and exploring the underlying eclipse mechanisms. Additionally, we aim to study the polarization properties of these MSPs, which remain unexplored around 2 GHz, and also to investigate high-frequency eclipses similar to those observed in systems like J1908+2105. Such eclipses suggest the presence of dense and magnetized plasma environments, enabling more precise constraints on parameters like electron column density and magnetic field strengths. Furthermore, we plan to probe magnetic fields by observing potential changes in rotation measure (RM) at eclipse ingress and egress.

Organization: CSIRO Data Access Portal
Parkes observations for project P1325 semester 2025APRS_06

We request 15 hours of observing time with the Parkes UWL receiver (700-4000 MHz) to investigate frequency-dependent eclipsing in three spider millisecond pulsars (MSPs): one redback and two black widows. Spider MSPs commonly exhibit frequency-dependent eclipsing, which provides insights into their dense, magnetized plasma environments. We propose to use the Parkes telescope with the UWL receiver in full polar mode to investigate key properties of three spider MSPs, focusing on their eclipse mechanisms and polarization characteristics. Our goals include modeling the eclipse phase spectra using wideband observations to examine the transition from optically thick to thin regimes and exploring the underlying eclipse mechanisms. Additionally, we aim to study the polarization properties of these MSPs, which remain unexplored around 2 GHz, and also to investigate high-frequency eclipses similar to those observed in systems like J1908+2105. Such eclipses suggest the presence of dense and magnetized plasma environments, enabling more precise constraints on parameters like electron column density and magnetic field strengths. Furthermore, we plan to probe magnetic fields by observing potential changes in rotation measure (RM) at eclipse ingress and egress.

Organization: CSIRO Data Access Portal
Parkes observations for project P1328 semester 2025APRS_14

Fast radio bursts are peculiar micro-millisecond duration transients, which have been seen to be extragalactic in origin. Since their discovery, a dichotomy has emerged in their population. Some FRBs have been seen to be repeating, while others have not been seen to be repeating. The repeating FRBs, such as FRB 20180301A, provide an unparalleled window into their circumburst environment due to their repeating nature, which can be used to constrain possible progenitor models and test underlying emission mechanisms. Additionally, FRB 20180301A has been seen to have interesting polarisation properties, such as a switch in the sign of RM, indicating a reversal in the magnetic field and a marked reduction in the linear polarisation fraction towards lower frequencies (depolarisation). The previous Parkes/Murriyang source follow-up has also revealed a temporal evolution in the dispersion measure (DM) of the source and tentative evidence for correlation in the DM and rotation measure (RM). The ultra-wideband low (UWL) receiver on Parkes/Murriyang is ideally suited to explore the wideband spectro-temporal and polarimetric behaviour of the source. We propose regular monitoring of FRB 20180301A using UWL to model the magnetic field evolution, study its circumburst media using depolarisation behaviour, and constrain any correlation of DM and RM.

Organization: CSIRO Data Access Portal
Parkes observations for project P960 semester 2025APRS_07

We aim to carry out receiver pointing and characterisation tests of Parkes receivers. Typically, these tests are carried out after the receiver package is installed, but time does not always allow for proper characterisation. Receivers for consideration include UWL, MARS and 13MM packages. In addition to cross-referencing C007 for flux calibration via pointing, we aim to conduct gain-elevation and system temperature experiments using the Moon, to ensure users of the Parkes Observatory have the most accurate information available for calibration purposes.

Organization: CSIRO Data Access Portal
Parkes observations for project P1054 semester 2025APRS_09

With this proposal we ask time to continue our timing follow-up campaign of pulsars discovered with the MeerKAT telescope. Fourtytwo sources have been discovered in targeted observations of Fermi unidentified point sources, two towards Supernova Remnants, 19 in the Magellanic Clouds, 105 in Globular Clusters and 81 in a survey of the Galactic plane. A large fraction of the new discoveries are recycled pulsars (including a few relativistic systems and several 'spider' binaries), or young pulsars. Timing observations have an essential role in exploiting the full potential of any pulsar discovery, allowing for the precise measurement of rotational, astrometric and orbital parameters which, in turn, give us powerful tools to improve our understanding of the physics in extreme environments as well as of the population of neutron stars as a whole. The UWL receiver of the Parkes telescope is a sensitive, versatile instrument that is allowing us to successfully time these new sources, in the bright-end of TRAPUM discoveries.

Organization: CSIRO Data Access Portal
Parkes observations for project P1054 semester 2025APRS_12

With this proposal we ask time to continue our timing follow-up campaign of pulsars discovered with the MeerKAT telescope. Fourtytwo sources have been discovered in targeted observations of Fermi unidentified point sources, two towards Supernova Remnants, 19 in the Magellanic Clouds, 105 in Globular Clusters and 81 in a survey of the Galactic plane. A large fraction of the new discoveries are recycled pulsars (including a few relativistic systems and several 'spider' binaries), or young pulsars. Timing observations have an essential role in exploiting the full potential of any pulsar discovery, allowing for the precise measurement of rotational, astrometric and orbital parameters which, in turn, give us powerful tools to improve our understanding of the physics in extreme environments as well as of the population of neutron stars as a whole. The UWL receiver of the Parkes telescope is a sensitive, versatile instrument that is allowing us to successfully time these new sources, in the bright-end of TRAPUM discoveries.

Organization: CSIRO Data Access Portal
Parkes observations for project P1365 semester 2025APRS_08

We propose a timing follow-up project for two newly discovered pulsars, J0915-6635 and J0917-6642, from the MWA-SMART survey. These pulsars were recently discovered from a blind periodic search of an 80-min SMART survey observation, with an localisation precision of 4 arcminutes. Initial flux density estimates suggest they are faint, requiring follow-up with the Parkes UWL receiver for precise timing solutions, flux density measurements, and polarimetric analysis. Initial analysis suggests a flux density 0.2-0.5 mJy for J0915-6635, and 0.1-0.3 mJy for J0917-6642  at 1.4 GHz, assuming a spectral index of -1.6. Observations with the Murriyang's UWL receiver will help enable a faster convergence to the full coherent timing solution and determine their spin and astrometric parameters, as well as further investigate this through measurements of pulsar flux densities and spectral indices. We will also perform a polarimetric analysis across a wide frequency range to better constrain the pulsars' geometries and emission properties.

Organization: CSIRO Data Access Portal
Parkes observations for project P1050 semester 2023OCTS_18

This is a request for the observation time for the timing campaign of new pulsars discovered in the reprocessing of the low-latitude Galactic plane section of the HTRU-S survey (HTRU-S LowLat) and the Parkes Multibeam Pulsar Survey (PMPS). We have completed 90 % of the HTRU-S LowLat survey and completed zero acceleration PMPS search with GPU-based coherent acceleration search, template bank, and fast folding algorithm pipelines and now have discovered 112 previously unknown pulsars among which 18 were found in the PMPS. Interesting science can usually only be derived from a new pulsar after confirmation, and a follow-up timing campaign is carried out. At least 1-2 year of initial timing is the minimum timespan required to fully characterise any newly-discovered pulsars, essential for deriving pulsar parameters such as the characteristic age, magnetic field strength, and spin-down rate, as well as for detecting any unexpected behaviour of the pulsar which might result from emission instabilities. This project is necessary for the timing of several interesting pulsars, including binary pulsars, high DM pulsars, scattered profile pulsars, and bright ones that show emissions in larger bandwidths in the UWL band. Apart from this, finding the nature of a unique binary pulsar system via a dedicated observing campaign is also another goal. The follow-up timing in semester 2023OCTS will assist in completing many exciting large-term science goals.

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Long-term project observations for project P455 semester 2025APRS_02

This project is to continue timing and profile studies of the first double-pulsar system, a unique laboratory for gravitational physics. Important results published in our 53-page Phys. Rev. X paper (2021) include the first measurements of higher-order light-propagation effects and of the relativistic deformation of the orbit and highlight the importance of a long term observational campaign, including VLBI observations, for this remarkable system. The main aims of this proposal are to provide the strongest tests to date for general relativity and to measure for the first time the moment-of-inertia of a neutron star. Additionally, we will determine the system geometry, map the pulsar beams via geodetic precession, and search for the reappearance of Pulsar B. We exploit the high sensitivity and broad bandwidth of the UWL receiver. We are collaborating with the MeerKAT Double Pulsar Timing team to optimise combination of MeerKAT and UWL data.

Organization: CSIRO Data Access Portal
Long-term project observations for project P455 semester 2025APRS_01

This project is to continue timing and profile studies of the first double-pulsar system, a unique laboratory for gravitational physics. Important results published in our 53-page Phys. Rev. X paper (2021) include the first measurements of higher-order light-propagation effects and of the relativistic deformation of the orbit and highlight the importance of a long term observational campaign, including VLBI observations, for this remarkable system. The main aims of this proposal are to provide the strongest tests to date for general relativity and to measure for the first time the moment-of-inertia of a neutron star. Additionally, we will determine the system geometry, map the pulsar beams via geodetic precession, and search for the reappearance of Pulsar B. We exploit the high sensitivity and broad bandwidth of the UWL receiver. We are collaborating with the MeerKAT Double Pulsar Timing team to optimise combination of MeerKAT and UWL data.

Organization: CSIRO Data Access Portal
Parkes observations for project P1211 semester 2024APRS_18

Traditional pulsar searching techniques are not sensitive enough to extreme pulsars such as millisecond pulsars (MSPs) in compact binaries (e.g., Pulsar-Blackhole binary systems), extremely fast spinning pulsars (e.g., sub-MSPs), and high dispersion measure (DM) pulsars. Such a situation is now changed thanks to the development of next generation radio telescope arrays such as Australian Square Kilometer Array Pathfinder (ASKAP). ASKAP is capable of conducting highly sensitive radio continuum surveys with wide sky coverage (e.g, Evolutionary Map of The Universe survey). One of the solutions is to find pulsar candidates in radio continuum surveys such as ASKAP surveys and then carry out targeted searches. This technique allows us to search over the wide bandwidth with full field of view while avoiding the need for expensive pixel-by-pixel high time resolution searches. In this proposal, we propose to observe 16 pulsar candidates identified in the Galactic plane using new ASKAP EMU images. We found 22 candidates by selecting sources with spectral index steeper than -2.0 and compactness less than 1.2. Among them 13 are known pulsars and a reasonable number of candidates to follow up (9 sources). In total, we have 16 candidates including seven sources from 2023APRS semester. Because of the dense ionised medium in the Galactic Plane, MSPs are likely to be missed by previous pulsar surveys carried out at 1.4 GHz. Here, we propose a targeted pulsar search with the Parkes UWL which allow us to search pulsation at higher frequencies and therefore avoid strong DM smearing and scattering effects.

Organization: CSIRO Data Access Portal