DOI: 10.1002/2017JA024291
Scopus记录号: 2-s2.0-85047560234
论文题名: Spatial and Temporal Ionospheric Monitoring Using Broadband Sferic Measurements
作者: McCormick J.C. ; Cohen M.B. ; Gross N.C. ; Said R.K.
刊名: Journal of Geophysical Research: Space Physics
ISSN: 21699380
出版年: 2018
卷: 123, 期: 4 起始页码: 3111
结束页码: 3130
语种: 英语
英文关键词: D region ionosphere
; lightning
; sferics
; VLF
英文摘要: The D region of the ionosphere (60–90 km altitude) is highly variable on timescales from fractions of a second to many hours, and on spatial scales up to many hundreds of kilometers. Very low frequency (VLF) and low-frequency (LF) (3–30 kHz and 30–300 kHz) radio waves are guided to global distances by reflections from the ground and the D region. Therefore, information about its current state is encoded in received VLF/LF signals. VLF transmitters have been used in the past for D region studies, with ionospheric disturbances manifesting as perturbations in amplitude and/or phase. The return stroke of lightning is an impulsive VLF radiator, but unlike VLF transmitters, lightning events are distributed broadly in space allowing for much greater spatial coverage of the D region compared to VLF transmitter-based remote sensing in addition to the broadband spectral advantage over the narrowband transmitters. The challenge is that individual lightning-generated waveforms, or “sferics,” vary due to the lightning current parameters and uncertainty in the time/location information, in addition to D region ionospheric variability. These factors make it difficult to utilize the VLF/LF emissions from lightning in a straightforward manner. We describe a technique to recover the time domain and amplitude/phase spectra for both Bϕ and Br with high fidelity and consider the utility of our technique with ambient and varied ionospheric conditions. We demonstrate a technique to simulate sferics and infer a parameterized ionosphere with the Wait and Spies parameters (h’ and β) offering all of the tools needed for a global measurement. ©2018. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/114174
Appears in Collections: 气候减缓与适应
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作者单位: Department of Electrical and Computer Engineering, Georgia Institute of Technology, Atlanta, GA, United States; Vaisala Inc., Louisville, CO, United States
Recommended Citation:
McCormick J.C.,Cohen M.B.,Gross N.C.,et al. Spatial and Temporal Ionospheric Monitoring Using Broadband Sferic Measurements[J]. Journal of Geophysical Research: Space Physics,2018-01-01,123(4)