Filtering by Subject: Other Physics

Continuous isolated noise sources induce repeating waves in the coda of ambient noise correlations

Sven Schippkus, Mahsa Safarkhani, Celine Hadziioannou

Published: 2023-03-17
Subjects: Geophysics and Seismology, Other Physics

Continuous excitation of isolated noise sources leads to repeating wave arrivals in cross correlations of ambient seismic noise, including throughout their coda. These waves propagate from the isolated sources. We observe this effect on correlation wavefields computed from two years of field data recorded at the Gräfenberg array in Germany and two master stations in Europe. Beamforming the [...]

Detection of VLF attenuation in the Earth-ionosphere waveguide caused by X-class solar flares using a global lightning location network

Todd Anderson, Michael McCarthy, Robert Holzworth

Published: 2020-01-09
Subjects: Astrophysics and Astronomy, Earth Sciences, Geophysics and Seismology, Other Physics, Physical Sciences and Mathematics, Physics, The Sun and the Solar System

Solar flares, energetic particles and Earth-impacting coronal mass ejections enhance ionization in the lower ionosphere, inhibiting radio wave propagation in the Earth-ionosphere waveguide (EIWG). This enhanced ionization is observed locally by ionosondes and GPS/GNSS receivers, but spatial coverage of these observations is limited by receiver location. VLF propagation studies have previously [...]

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