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  • English  (3)
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  • 1
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    Inter‐Calibrated Measurements of Intense Whistlers by Arase and Van Allen Probes (2021)
    In:  Journal of Geophysical Research: Space Physics
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    Publication Date: 2022-03-17
    Description: Measurements of electromagnetic waves in space plasmas are an important tool for our understanding of physical processes in this environment. Inter-calibration of data from different spacecraft missions is necessary for combining their measurements in empirical models or case studies. We show results collected during a close conjunction of the Van Allen Probes and Arase spacecraft. The inter-calibration is based on a fortuitous case of common observations of strong whistlers at frequencies between a few hundred hertz and 10 kHz, which are generated by the same lightning strokes and which propagate along very similar paths to the two spacecraft. Measured amplitudes of the magnetic field fluctuations are the same within ∼14% precision of our analysis, corresponding to 1.2 dB. Currently, archived electric field measurements show twice larger amplitudes on Arase compared to Van Allen Probes but they start to match within ∼33% precision (2.5 dB) once the newest results on the interface of the antennas to the surrounding plasma are included in the calibration procedures. Ray tracing simulations help us to build a consistent scenario of wave propagation to both spacecraft reflected by a successful inter-calibration of the polarization and propagation parameters obtained from multicomponent measurements. We succeed in linking the spacecraft observations to localizations of lightning return strokes by two different ground-based networks which independently verify the correctness of the Universal Time tags of waveform measurements by both spacecraft missions, with an uncertainty better than 10 ms.
    Language: English
    Type: info:eu-repo/semantics/article
    Format: application/pdf
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  • 2
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    Using multipoint observations to quantify microburst precipitation caused by whistler mode chorus waves (2023)
    In:  XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
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    Publication Date: 2023-07-25
    Description: Microbursts are impulsive injections of energetic (few keV to MeV) electrons into the atmosphere, primarily caused by nonlinear scattering by whistler mode chorus waves. While the relative importance of microburst precipitation as a loss process has not been fully quantified, many studies have shown microbursts may be a major loss source for outer radiation belt electrons. Conjunction observations between the FIREBIRD II CubeSats and Van Allen Probes (RBSP) from 2015 – 2019 have presented the opportunity to quantify the importance of microburst precipitation. We utilize this conjunction dataset, along with additional observations of chorus and microburst precipitation, when available, to constrain the size of the microburst-producing chorus region. We will present statistical results for the upper and lower bounds on the size of the region. Additionally, we will discuss wave properties, including amplitude, wave normal angle, duration, and microburst properties including flux and duration to further understand the observable dependence.
    Language: English
    Type: info:eu-repo/semantics/conferenceObject
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  • 3
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    Developing chorus wave model using Van Allen Probe and Arase data (2023)
    In:  XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
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    Publication Date: 2023-12-12
    Description: Chorus waves play an important role in the dynamic evolution of energetic electrons in the Earth’s radiation belts and ring current. Due to the orbit limitation of Van Allen Probes, our previous chorus wave model developed using Van Allen Probe data is limited to low latitude. In this study, we extend the chorus wave model to higher latitudes by combining measurements from the Van Allen Probes and Arase satellite. As a first step, we intercalibrate chorus wave measurements by comparing statistical features of chorus wave observations from Van Allen Probes and Arase missions. We first investigate the measurements in the same latitude range during the two years of overlap between the Van Allen Probe data and the Arase data. We find that the statistical intensity of chorus waves from Van Allen Probes is stronger than those from Arase observations. After the intercalibration, we combine the chorus wave measurements from the two satellite missions and develop an analytical chorus wave model which covers all magnetic local time and extends to higher latitudes. This chorus wave model will be further used in radiation belt and ring current simulations.
    Language: English
    Type: info:eu-repo/semantics/conferenceObject
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