Supervised Detection of Ionospheric Scintillation in Low-Latitude Radio Occultation Measurements
| Autor: | Ludwig Barbosa, Vinícius, Sievert, Thomas, Carlström, Anders, Pettersson, Mats, Vu, Viet Thuy, Rasch, Joel |
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| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
scintillation
radio occultation Science Meteorologi och atmosfärforskning Signalbehandling ionosphere Physics::Geophysics Remote Sensing Radio Occultation Machine Learning remote sensing Meteorology and Atmospheric Sciences Signal Processing Physics::Space Physics support vector machine Ionosphere Scintillation Physics::Atmospheric and Oceanic Physics |
| Zdroj: | Remote Sensing, Vol 13, Iss 1690, p 1690 (2021) |
| ISSN: | 2072-4292 |
| Popis: | Global Navigation Satellite System (GNSS) Radio Occultation (RO) has provided high- quality atmospheric data assimilated in Numerical Weather Prediction (NWP) models and climatol- ogy studies for more than 20 years. In the satellite–satellite GNSS-RO geometry, the measurements are susceptible to ionospheric scintillation depending on the solar and geomagnetic activity, seasons, geographical location and local time. This study investigates the application of the Support Vector Machine (SVM) algorithm in developing an automatic detection model of F-layer scintillation in GNSS-RO measurements using power spectral density (PSD). The model is intended for future analyses on the influence of space weather and solar activity on RO data products over long time periods. A novel data set of occultations is used to train the SVM algorithm. The data set is composed of events at low latitudes on 15–20 March 2015 (St. Patrick’s Day geomagnetic storm, high solar flux) and 14–19 May 2018 (quiet period, low solar flux). A few conditional criteria were first applied to a total of 5340 occultations to define a set of 858 scintillation candidates. Models were trained with scintillation indices and PSDs as training features and were either linear or Gaussian kernel. The investigations also show that besides the intensity PSD, the (excess) phase PSD has a positive contribution in increasing the detection of true positives. open access |
| Databáze: | OpenAIRE |
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