Ionospheric response to infrasonic‐acoustic waves generated by natural hazard events

Ionospheric Response to Infrasonic-Acoustic Waves Generated by Natural Hazard Events

Recent measurements of GPS-derived total electron content (TEC) reveal acoustic wave periods of ∼1–4 min in the F region ionosphere following natural hazard events, such as earthquakes, severe weather, and volcanoes. Here we simulate the ionospheric responses to infrasonic-acoustic waves, generated by vertical accelerations at the Earth’s surface or within the lower atmosphere, using a compress...

Ionospheric Signatures of Acoustic Waves Generated by Transient Tropospheric Forcing

Ionospheric erosion by Alfvén waves

Abstract: Using observations from the FAST small explorer spacecraft we present fields and plasma observations above the dayside auroral oval showing the erosion of ionospheric plasmas from the topside ionosphere by the action of Alfvén waves. Using interferometric techniques the waves are shown to approximately obey the expected dispersion for Alfvén waves with transverse scales extending from...

Ionospheric Ion Acceleration by Multiple Electrostatic Waves

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The Response of Fluvial Systems to Large Flood Events

In the summer of 2001, an intense thunderstorm in southeastern Caspian Sea triggered a catastrophic flood in the Madarsoo basin . Use of methods including high-resolution aerial photographs and satellite images interpretation, multi-date mapping, hydraulic calculations and field observations made possible the documentation of the geomorphic impacts on the Madarsoo River and its tributaries. Geo...