Speaker
Description
Inner magnetospheric dynamics and coupling processes are highly dynamic, in part due to the interaction of electrons with a variety of electromagnetic waves. Here we present a novel combination of observations made in Fennoscandia that reveal energetic electron precipitation into the D-region ionosphere due to these coupling processes. We identify various magnetospheric phenomena, including substorms and a variety of EMIC waves. Using the European Incoherent Scatter (EISCAT) UHF radar located in Tromsø, Norway, we investigate how the electron density (Ne) profile changes when energetic electron precipitation occurs as a result of inner magnetospheric processes. Additionally, we monitor the lower D-region close to EISCAT using Sodankylä Geophysical Observatory’s (SGO) Very Low Frequency (VLF) receiver observations at Kilpisjärvi (KIL), Finland, of 16.4 kHz transmissions from the Noviken facility (call sign JXN) in Norway.
We examine a remarkable day in March 2023 focussing on (i) a seven-hour dayside train of EMIC waves, (ii) an Interval of Pulsations of Diminishing Period (IPDP) at dusk, and (iii) several substorms. The train of EMIC waves is very clearly seen using the SGO search coil magnetometer (SCM) at Abisko (Sweden) located on the JXN-KIL VLF path, ~130 km from the UHF radar. The processes we are describing in this 24-hour period highlight dynamic magnetospheric processes, loss mechanisms from the radiation belts, and provide insight into the space weather impact on the Earth’s lower thermosphere and ionosphere.
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