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Parkes observations for project P1008 semester 2019APRS_06
Magnetic field measurements of the Solar wind (SW) are extremely challenging, especially at close angular distances from the Sun. If they are obtained by measuring Faraday rotation of the radiation of background sources like active galactic nuclei, they are typically dependent on models of the electron density distribution in the heliosphere. Howev... moreer, pulsars can provide simultaneous, model-independent measurements of the electron density along the line-of-sight, along with Faraday Rotation estimates, and thus direct measurements of the SW magnetic field.
Moreover, high-precision pulsar timing experiments such as Pulsar Timing Arrays (PTAs) can be strongly affected by the free electron distribution in the SW, and it is fundamentally important to understand, model and mitigate its influence on PTAs signals.
With this proposal we aim to obtain high-cadence and precise measurements of the magnetic field and the electron density distribution of the SW by tracking three pulsars with low- to mid-ecliptic latitudes during their Solar approaches, and to reconstruct the SW dependence on the heliographic latitude. This will allow us to characterise the magnetic field of the SW and to collect precious information about the short-term fluctuations in the electron density that can appear as correlated noise in PTAs. less
Astronomical and Space Sciences not elsewhere classified
01 Apr 2019
30 Sep 2019
Creative Commons Attribution 4.0 International Licence
Tiburzi, Caterina; Verbiest, Joris P.W. ; Oslowski, Stefan; Shaifullah, Golam; Janssen, Gemma; Zucca, Pietro; Moochickal Ambalappat, Krishnakumar; Fallows, Richard (2019): Parkes observations for project P1008 semester 2019APRS_06. v1. CSIRO. Data Collection.
All Rights (including copyright) CSIRO 2019.
Access to this collection's metadata and/or files (if any) are restricted until 30 Mar 2021.
Australia Telescope National Facility
P1008 - Tracking the Solar wind with pulsars
The Sun is extremely important for the Earth and for human life. However, some of its aspects are not very well known. For example, the magnetic field that the Sun is releasing into the Solar system remains poorly measured. We will observe very special astronomical objects, called pulsars and observe how the Sun affects the radiation emitted by the... morese distant, relic stars. By doing this, we can measure the magnetic field associated with the Solar Wind, a constant stream of particles emitted by the Sun and the magnetic field that is connected to, and shaped by, these particles. We will also measure properties useful for projects as pulsar timing arrays which are interferometers the size of the Milky Way galaxy, built using a large collection of observations of many pulsars with the aim of detecting the gravitational waves emitted during the merger of the most massive blackhole binaries. less
Joris P.W. Verbiest
Krishnakumar Moochickal Ambalappat