Plasmaspheric Hiss: Coherent and Intense

0501724 - ÚFA 2019 RIV US eng J - Článek v odborném periodiku
Tsurutani, B. T. - Park, S.A. - Falkowski, B. J. - Lakhina, G. S. - Pickett, J. S. - Bortnik, J. - Hospodarsky, G. - Santolík, Ondřej - Parrot, M. - Henri, P. - Hajra, R.
Plasmaspheric Hiss: Coherent and Intense.
Journal of Geophysical Research-Space Physics. Roč. 123, č. 12 (2018), s. 10009-10029. ISSN 2169-9380. E-ISSN 2169-9402
Grant ostatní: AV ČR(CZ) AP1401
Program: Akademická prémie - Praemium Academiae
Institucionální podpora: RVO:68378289
Klíčová slova: plasmaspheric hiss * substorm and solar wind dependence * plasmaspheric hiss wave polarizations * electromagnetic wave coherency * formation of the electron slot * relativistic electron precipitation
Obor OECD: Fluids and plasma physics (including surface physics)
Impakt faktor: 2.821, rok: 2018
https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2018JA025975

Intense similar to 300-Hz to 1.0-kHz plasmaspheric hiss was studied using Polar plasma wave data. It is found that the waves are coherent in all local time sectors with the wave coherency occurring in approximately three- to five-wave cycle packets. The plasmaspheric hiss in the dawn and local noon time sector are found to be substorm (AE*) and storm (SYM-H*) dependent. The local noon sector is also solar wind pressure dependent. It is suggested that coherent chorus monochromatic subelements enter the plasmasphere (as previously suggested by ray tracing models) to explain these plasmaspheric hiss features. The presence of intense, coherent plasmaspheric hiss in the local dusk and local midnight time sectors is surprising and more difficult to explain. For the dusk sector waves, either local in situ plasmaspheric wave generation or propagation from the dayside plasmasphere is possible. There is little evidence to support substorm generation of the midnight sector plasmaspheric hiss found in this study. One possible explanation is propagation from the local noon sector. The combination of high wave intensity and coherency at all local times strengthens the suggestion that the electron slot is formed during substorm intervals instead of during geomagnetic quiet (by incoherent waves). Plasmaspheric hiss is found to propagate at all angles relative to the ambient magnetic field, theta(kB). Circular, elliptical, and linear polarized plasmaspheric hiss have been detected. No obvious, strong relationship between the wave polarization and theta(kB) was found. This information of hiss properties should be useful in modeling wave-particle interactions within the plasmasphere.
Trvalý link: http://hdl.handle.net/11104/0293737