On the Change of the Magnetic Power Spectrum at Interplanetary Shocks

0471484 - ÚFA 2017 SG eng A - Abstrakt
Krupařová, Oksana - Krupař, Vratislav - Šafránková, J. - Němeček, Z. - Santolík, Ondřej - Souček, Jan - Maksimovic, M. - Chen, Ch.
On the Change of the Magnetic Power Spectrum at Interplanetary Shocks.
Abstracts of AOGS : 13th Annual Meeting. Singapore: Asia Oceania Geosciences Society, 2016.
[AOGS Annual Meeting /13./. 31.07.2016-05.08.2016, Beijing]
Institucionální podpora: RVO:68378289
Klíčová slova: interplanetary shocks * magnetic field measurement * spectrum analysis
Kód oboru RIV: BL - Fyzika plazmatu a výboje v plynech

Interplanetary (IP) shocks are characterized by abrupt changes of plasma parameters
and the magnetic field strength. We have identified 1,068 IP shocks in data obtained
by the Wind spacecraft between 1995 and 2015. We statistically compared magnetic
power spectra before and after IP shock crossings for four IP shock types using
normalization to two spatial scales in the plasma frame: the proton gyroradius and
proton inertial length. Generally, larger fluctuations were observed in the
downstream when compared to the upstream. We can identify the break of the power law
spectra between the MHD and kinetic scales. We found that the magnetic spectra for
different events become aligned after normalization of the wavenumber by proton
gyroradius and proton inertial length for fast and slow shocks, respectively.
Trvalý link: http://hdl.handle.net/11104/0268863