Empirical parameterisations of ULF power and drift orbit averaged radial diffusion coefficients from ground magnetometers for different MLT
Year: 2025
Type: article
Abstract: Oral presentation at the 17th HelAS conference. Abstract: Radial diffusion, generated by ultra-low frequency (ULF) waves, is an important process for the transport of electrons in the outer radiation belt. Ground magnetometers give us constant observations of such ULF waves but their usefulness is limited by the models used to transform ground measurements into their progenitor fields in space. A typical assumption is that of a dipole field, and so measurements can only be reliably performed during the day. We have chosen a series of magnetometer stations at different sets of geomagnetic latitudes, with stations in each set separated by several hours in longitude, and compared their Pc5 ULF power measurements, and the resulting calculated radial diffusion coefficients, from 11 years of their data. By comparing the mismatch of their results when they were in different time sectors, and for different values of Kp, we were able to assess the median deviation of measurements conducted before dawn or after dusk with those on the day side. This will be useful for projects requiring a limited selection of magnetometers, such as FARBES (Forecast of Actionable Radiation Belt Scenarios).
Authors: Dimitrakoudis, Stavros, Balasis, Georgios, Boutsi, Adamantia Zoe, Daglis, Ioannis, Papadimitriou, Constantinos, Katsavrias, Christos, Georgiou, Marina, Lichtenberger, János
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W6893438501
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