De Pablos Aguero, Diego;
(2022)
Comparing Timescales between Solar Wind and Coronal Observations: An Application of Empirical Mode Decomposition.
Doctoral thesis (Ph.D), UCL (University College London).
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Abstract
One of the objectives of the Solar Orbiter mission is to quantify how the Sun creates and controls the heliosphere. The spacecraft will observe the Sun with unprecedented temporal and spatial resolution and will sample the sparse, hot plasma that flows from the Sun known as the solar wind. To succeed in its aim, Solar Orbiter will require pointing of its remote sensing instruments to the region most likely to produce solar wind, which will later be measured by the spacecraft. This is not a small task, as it requires a combination of knowledge of the Sun, its magnetic field, solar wind dynamics, and a comprehensive verification of the results. In this work, we have explored a methodology which enables a systematic comparison of observations from the corona and the solar wind. The first study presents, evaluates, and applies a method to compare coronal observations to in situ measurements of the solar wind using Empirical Mode Decomposition. The second study compares coronal observations with solar wind measurements made by spacecraft closer to the Sun. We compare Active Region observations with the outflowing solar wind sampled at Solar Orbiter, and Coronal Hole observations with solar wind reaching Parker Solar Probe, another spacecraft that samples near Sun solar wind. The third and final study concentrates on the persistence of timescales within solar wind observations, where we study in situ data from different spacecraft in radial alignment, at different distances from each other. In each of these studies we successfully extract a correction factor to each of the measured solar wind velocities, constructing a framework to investigate the origins of individual solar wind streams, and the radial evolution of the solar wind protonvelocity. We conclude that, on a case-by-case basis, our technique can be applied to aid modelling efforts and explore the question of solar wind origins in greater detail.
| Type: | Thesis (Doctoral) |
|---|---|
| Qualification: | Ph.D |
| Title: | Comparing Timescales between Solar Wind and Coronal Observations: An Application of Empirical Mode Decomposition |
| Open access status: | An open access version is available from UCL Discovery |
| Language: | English |
| Additional information: | Copyright © The Author 2022. Original content in this thesis is licensed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International (CC BY-NC 4.0) Licence (https://creativecommons.org/licenses/by-nc/4.0/). Any third-party copyright material present remains the property of its respective owner(s) and is licensed under its existing terms. Access may initially be restricted at the author’s request. |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Space and Climate Physics |
| URI: | https://discovery-pp.ucl.ac.uk/id/eprint/10161274 |
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