The upward propagating ionospheric hiss waves during the seismic time observed by the China seismo-electromagnetic satellite
نویسندگان
چکیده
The ionospheric hiss wave is a broadband incoherent and structureless electromagnetic emission. They appear in relatively narrower frequency range between −0.1 1.5 kHz. However, according to previous observations, abnormal emissions during seismic activities also preferentially the same of hiss. This work studies propagation features time based on observations from CSES (China Seismo-Electromagnetic Satellite). vector analysis shows that activities, except for downward propagating which common phenomenon ionosphere, there are upward mixed with We made statistical shallow strong earthquakes (M ≥ 6.0, depth below 30 km) occurred mainland China 2019 2022. selected events recorded by orbits passing over epicenters within window (the 1-month prior 1-week after main shock). found although most typical waves, however, certain emissions. distribution parameters major part normal angles vary 40 60, azimuthal predominately attain 40, ellipticity more complicated feature varying around ± 0.5, planarity values predominate at 0.6 1. band mostly varies 300 Hz 800 Hz. To further study behavior such time, we compared under non-seismic activity quiet space weather conditions, results confirm occurrence rate conditions far less than time. suggest link activity, but physical reason behind it still remains puzzle us.
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ژورنال
عنوان ژورنال: Frontiers in Astronomy and Space Sciences
سال: 2023
ISSN: ['2296-987X']
DOI: https://doi.org/10.3389/fspas.2023.1127738