Papers › Observation of solar radio burst events from Mars orbit with the Shallow Radar instrument
Observation of solar radio burst events from Mars orbit with the Shallow Radar instrument
Christopher Gerekos, Gregor Steinbrügge, Immanuel Jebaraj, Andreas Casillas, Elena Donini, Beatriz Sánchez-Cano, Mark Lester, Jasmina Magdalenić, Sean Peters, Andrew Romero-Wolf, Donald Blankenship
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Multispacecraft and multiwavelength observations of solar eruptions such as flares and coronal mass ejections are essential to understand the complex processes behind these events. The study of solar burst events in the radio-frequency spectrum has relied almost exclusively on data from ground-based observations and a few dedicated heliophysics missions such as STEREO or Wind. Reanalysing existing data from the Mars Reconnaissance Orbiter (MRO) Shallow Radar (SHARAD) instrument, a Martian planetary radar sounder, we have discovered the instrument was also capable of detecting solar radio bursts, and was able to do so with unprecedented resolution for a space-based solar instrument. In this study we aim at demonstrating the reliability and value of SHARAD as a new solar radio-observatory. We characterised the sensitivity of the instrument to type-III solar radio bursts through a statistical analysis of correlated observations, using STEREO and Wind as references. Using 38 correlated detections, we establish the conditions under which SHARAD can observe solar bursts in terms of acquisition geometry. As an example of scientific application, we also present the first analysis of type-III characteristic times at high resolution beyond 1 AU. A simple logistic model based purely on geometrical acquisition parameters can predict burst show vs. no-show in SHARAD data with an accuracy of 79.2%, demonstrating the reliability of the instrument for detecting solar bursts and laying the foundation for using SHARAD as a solar radio-observatory. The extremely high resolution of the instrument, both in temporal and frequency directions, its bandwidth, and its position in the solar system enable SHARAD to make significant contributions to heliophysics; it could inform on plasma processes on the site of the burst generation and along the propagation path of associated fast electron beams.
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