Speaker
Description
Low-frequency radio observations have been expected to serve as a powerful tool for Space Weather observations for decades. This is because (1) radio observations are sensitive to a wide range of Space Weather-related observations ranging from emissions from coronal mass ejections (CMEs) to studies of the solar wind; and (2) the ground-based radio observatories provide high sensitivity data at high time and spectral resolution, which remains a challenge for most space-based observatories. While radio techniques like Interplanetary Scintillation (IPS) are well established in Space Weather research, radio imaging studies have remained technically challenging. This is now changing with the confluence of data from the Murchison Widefield Array (MWA), and the robust unsupervised analysis pipelines developed by our group. Recently, we have implemented a precise polarization calibration pipeline, which delivers full Stokes radio images with unprecedented fidelity and dynamic range. This tool is now enabling the potential of low-frequency radio observations for heliospheric and Space Weather research. An example includes measuring plasma parameters and magnetic fields of CMEs out to 8.5 solar radii using gyrosynchrotron modeling of full Stokes spectra. We will also share the current status of the objective to measure the heliospheric Faraday rotation towards numerous background linearly polarized radio sources with the Sun in the field of view.
| Presentation length | 15 minutes |
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