Examination of Radiation Belt Dynamics During Substorm Clusters: Magnetic Local Time Variation and Intensity of Precipitating Fluxes

Rodger, Craig J.; Clilverd, Mark A.; Hendry, Aaron T.; Forsyth, C.

doi:10.1029/2022ja030750

Cited by 6 publications

(7 citation statements)

References 80 publications

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“…However, Rodger et al. (2022) point out that the T0 measurements have been cross‐calibrated using multiple different independent data sets (one example being VLF/LF transmitters by Clilverd et al. (2010)) that do suggest T0 measures the precipitating flux.…”

Section: Instrumentation and Methodsmentioning

confidence: 99%

“…There has been some question about the validity of the T0 measurements; Selesnick et al (2020) suggest that the T0 telescope predominately measures stably trapped or quasi trapped flux in the drift loss cone rather than precipitating flux in the bounce loss cone. However, Rodger et al (2022) point out that the T0 measurements have been cross-calibrated using multiple different independent data sets (one example being VLF/LF transmitters by Clilverd et al (2010)) that do suggest T0 measures the precipitating flux. Furthermore, we have limited ourselves to measurements above a relatively high noise threshold (1,000 cm 2 sr 1 s 1 , shown by dotted line in Figure 1), where the precipitation should dominate the T0 measurements.…”

Section: Polar Orbiting Environmental Satellite (Poes)mentioning

confidence: 99%

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Characterizing Radiation‐Belt Energetic Electron Precipitation Spectra: A Comparison of Quasi‐Linear Diffusion Theory With In Situ Measurements

Reidy,

Horne,

Glauert

et al. 2024

JGR Space Physics

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High energy electron precipitation from the Earth's radiation belts is important for loss from the radiation belts and atmospheric chemistry. We follow up investigations presented in Reidy et al. (2021, https://doi.org/10.1029/2020ja028410) where precipitating flux is calculated inside the field of view of the POES T0 detector using quasi‐linear theory and pitch angle diffusion coefficients (Dαα) from the British Antarctic Survey (BAS). These results showed good agreements at >30 keV for L* >5 on the dawnside but the flux were too low at higher energies. We have investigated the effect of changing parameters in the calculation of the precipitating flux to improve the results for the higher energies using comparisons of in situ flux and cold plasma measurements from GOES‐15 and RBSP. We find that the strength of the diffusion coefficients rather than the shape of the source spectrum has the biggest effect on the calculated precipitation. In particular we find decreasing the cold plasma density used in the calculation of Dαα increases the diffusion and hence the precipitation at the loss cone for the higher energies, improving our results. The method of calculating Dαα is also examined, comparing co‐located rather than averaged RBSP measurements. We find that the method itself has minimal effect but using RBSP derived Dαα improved our results over using Dαα calculated using the entire BAS wave data base; this is potentially due to better measurements of the cold plasma density from RBSP than the other spacecraft included in the BAS wave data base (e.g., THEMIS).

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Section: Instrumentation and Methodsmentioning

confidence: 99%

Section: Polar Orbiting Environmental Satellite (Poes)mentioning

confidence: 99%

Characterizing Radiation‐Belt Energetic Electron Precipitation Spectra: A Comparison of Quasi‐Linear Diffusion Theory With In Situ Measurements

Reidy,

Horne,

Glauert

et al. 2024

JGR Space Physics

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“…This study builds upon previous work investigating the variations of trapped electron radiation belt fluxes using the same epochs, based on trapped low Earth orbit POES measurements as well as medium Earth orbit GPS measurements [1]. The current work, focused on precipitation variation, has recently been published in JGR [2].…”

mentioning

confidence: 91%

Examination of Radiation Belt Dynamics during Substorm Clusters: Magnetic Local Time Variation and Intensity of Precipitating Fluxes

Rodger,

Clilverd,

Hendry

et al. 2023

Proceedings of the XXXVth URSI General Assembly and Scientific Symposium – GASS 2023

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“…Conversely, energetic electrons drift dawnward and contribute, through their scattering and precipitation, to ionization and heating of the ionosphere (C. J. Rodger et al, 2022;Thorne et al, 2010). Substorm injections are mesoscale and transient phenomena (e.g., Gabrielse et al, 2014;Nakamura et al, 2002;Sorathia et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

The Key Role of Magnetic Curvature Scattering in Energetic Electron Precipitation During Substorms

Zou,

Zhang,

Artemyev

et al. 2024

Geophysical Research Letters

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Energetic electron precipitation (EEP) during substorms significantly affects ionospheric chemistry and lower‐ionosphere (<100 km) conductance. Two mechanisms have been proposed to explain what causes EEP: whistler‐mode wave scattering, which dominates at low latitudes (mapping to the inner magnetosphere), and magnetic field‐line curvature scattering, which dominates poleward. In this case study, we analyzed a substorm event demonstrating the dominance of curvature scattering. Using ELFIN, POES, and THEMIS observations, we show that 50–1,000 keV EEP was driven by curvature scattering, initiated by an intensification and subsequent earthward motion of the magnetotail current sheet. Using a combination of Swarm, total electron content, and ELFIN measurements, we directly show the location of EEP with energies up to ∼1 MeV, which extended from the plasmapause to the near‐Earth plasma sheet (PS). The impact of this strong substorm EEP on ionospheric ionization is also estimated and compared with precipitation of PS (<30 keV) electrons.

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Examination of Radiation Belt Dynamics During Substorm Clusters: Magnetic Local Time Variation and Intensity of Precipitating Fluxes

Cited by 6 publications

References 80 publications

Characterizing Radiation‐Belt Energetic Electron Precipitation Spectra: A Comparison of Quasi‐Linear Diffusion Theory With In Situ Measurements

Characterizing Radiation‐Belt Energetic Electron Precipitation Spectra: A Comparison of Quasi‐Linear Diffusion Theory With In Situ Measurements

Examination of Radiation Belt Dynamics during Substorm Clusters: Magnetic Local Time Variation and Intensity of Precipitating Fluxes

The Key Role of Magnetic Curvature Scattering in Energetic Electron Precipitation During Substorms

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