Zhang, Shuai, Rae, Jonathan, Watt, Clare, Degeling, Alexander W., Tian, Anmin, Shi, Quanqi, Shen, Xiao‐Chen, Smith, Andy. W. and Wang, Mengmeng (2021) Determining the temporal and spatial coherence of plasmaspheric hiss waves in the magnetosphere. Journal of Geophysical Research: Space Physics, 126 (2). e2020JA028635. ISSN 2169-9380
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Abstract
Plasmaspheric hiss is one of the most important plasma waves in the Earth's magnetosphere to contribute to radiation belt dynamics by pitch‐angle scattering energetic electrons via wave‐particle interactions. There is growing evidence that the temporal and spatial variability of wave‐particle interactions are important factors in the construction of diffusion‐based models of the radiation belts. Hiss amplitudes are thought to be coherent across large distances and on long timescales inside the plasmapause, which means that hiss can act on radiation belt electrons throughout their drift trajectories for many hours. In this study, we investigate both the spatial and temporal coherence of plasmaspheric hiss between the two Van Allen Probes from November 2012 to July 2019. We find ∼3,264 events where we can determine the correlation of wave amplitudes as a function of both spatial distance and time lag in order to study the spatial and temporal coherence of plasmaspheric hiss. The statistical results show that both the spatial and temporal correlation of plasmaspheric hiss decrease with increasing L‐shell, and become incoherent at L > ∼4.5. Inside of L = ∼4.5, we find that hiss is coherent to within a spatial extent of up to ∼1500 km and a time lag up to ∼10 min. We find that the spatial and temporal coherence of plasmaspheric hiss does not depend strongly on the geomagnetic index (AL*) or magnetic local time (MLT). We discuss the ramifications of our results with relevance to understanding the global characteristics of plasmaspheric hiss waves and their role in radiation belt dynamics.
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| Additional Information: | Funding information: The authors acknowledge the Van Allen Probes project team for EMFISIS data at https://spdf.sci.gsfc.nasa.gov/. This work was supported by the National Natural Science Foundation of China (Grants 41731068, 41974189, and 41961130382), the Shandong University (Weihai) Future Plan for Young Scholars (2017WHWLJH08), and the Royal Society Newton Advanced Fellowship (NAF/R1/191047). S. Zhang is supported by the State Scholarship Fund of Chinese Scholarship Council. I. J. Rae is supported by the Science and Technology Facilities Council (Grant ST/V006320/1), and the Natural Environment Research Council (Grants NE/P017150/1, NE/P017185/1, NE/V002554/1, and NE/V002724/1). C. E. J. Watt is supported by STFC grant ST/R000921/1 and NERC grant NE/P017274. X. C. Shen is supported by the NASA grants NNX17AD15G, 80NSS-C20K0557, 80NSSC20K0698, 80NSS-C20K1270. A. W. Smith is supported by the Science and Technology Facilities Council (Grants ST/S000240/1), and the Natural Environment Research Council (Grants NE/P017150/1 and NE/V002724/1). |
| Subjects: | F500 Astronomy G900 Others in Mathematical and Computing Sciences |
| Department: | Faculties > Engineering and Environment > Mathematics, Physics and Electrical Engineering |
| Depositing User: | John Coen |
| Date Deposited: | 15 Feb 2021 13:45 |
| Last Modified: | 16 Aug 2021 03:30 |
| URI: | http://nrl.northumbria.ac.uk/id/eprint/45431 |
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