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Ionospheric Plasma Density Oscillation Related to EMIC Pc1 Waves

Urheber*innen

Kim,  Hyangpyo
External Organizations;

Shiokawa,  Kazuo
External Organizations;

Park,  Jaeheung
External Organizations;

Miyoshi,  Yoshizumi
External Organizations;

Miyashita,  Yukinaga
External Organizations;

/persons/resource/cstolle

Stolle,  Claudia
2.3 Geomagnetism, 2.0 Geophysics, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

Kim,  Khan‐Hyuk
External Organizations;

/persons/resource/jmat

Matzka,  J.
2.3 Geomagnetism, 2.0 Geophysics, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

Buchert,  Stephan
External Organizations;

Fromm,  Tanja
External Organizations;

Hwang,  Junga
External Organizations;

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5002770.pdf
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Zitation

Kim, H., Shiokawa, K., Park, J., Miyoshi, Y., Miyashita, Y., Stolle, C., Kim, K., Matzka, J., Buchert, S., Fromm, T., Hwang, J. (2020): Ionospheric Plasma Density Oscillation Related to EMIC Pc1 Waves. - Geophysical Research Letters, 47, 15, e2020GL089000.
https://doi.org/10.1029/2020GL089000


Zitierlink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5002770
Zusammenfassung
We report the first observation of plasma density oscillations coherent with magnetic Pc1 waves. Swarm satellites observed compressional Pc1 wave activity in the 0.5–3 Hz band, which was coherent with in situ plasma density oscillations. Around the Pc1 event location, the Antarctic Neumayer Station III (L ~ 4.2) recorded similar Pc1 events in the horizontal component while NOAA‐15 observed isolated proton precipitations at energies above 30 keV. All these observations support that the compressional Pc1 waves at Swarm are oscillations converted from electromagnetic ion cyclotron (EMIC) waves coming from the magnetosphere. The magnetic field and plasma density oscillate in‐phase. We compared the amplitudes of density and magnetic field oscillations normalized to background values and found that the density power is much larger than the magnetic field power. This difference cannot be explained by a simple magnetohydrodynamic (MHD) model, although steep horizontal/vertical gradients of background ionospheric density can partly reconcile the discrepancy.