Citation

BibTex format

@article{Good:2023:2041-8213/acfd1c,
author = {Good, SW and Rantala, OK and Jylhä, AM and Chen, CHK and Möstl, C and Kilpua, EKJ},
doi = {2041-8213/acfd1c},
journal = {Astrophysical Journal Letters},
title = {Turbulence Properties of Interplanetary Coronal Mass Ejections in the Inner Heliosphere: Dependence on Proton Beta and Flux Rope Structure},
url = {http://dx.doi.org/10.3847/2041-8213/acfd1c},
volume = {956},
year = {2023}
}

RIS format (EndNote, RefMan)

TY  - JOUR
AB - Interplanetary coronal mass ejections (ICMEs) have low proton beta across a broad range of heliocentric distances and a magnetic flux rope structure at large scales, making them a unique environment for studying solar wind fluctuations. Power spectra of magnetic field fluctuations in 28 ICMEs observed between 0.25 and 0.95 au by Solar Orbiter and Parker Solar Probe have been examined. At large scales, the spectra were dominated by power contained in the flux ropes. Subtraction of the background flux rope fields increased the mean spectral index from −5/3 to −3/2 at kd i ≤ 10−3. Rope subtraction also revealed shorter correlation lengths in the magnetic field. The spectral index was typically near −5/3 in the inertial range at all radial distances regardless of rope subtraction and steepened to values consistently below −3 with transition to kinetic scales. The high-frequency break point terminating the inertial range evolved approximately linearly with radial distance and was closer in scale to the proton inertial length than the proton gyroscale, as expected for plasma at low proton beta. Magnetic compressibility at inertial scales did not show any significant correlation with radial distance, in contrast to the solar wind generally. In ICMEs, the distinctive spectral properties at injection scales appear mostly determined by the global flux rope structure while transition-kinetic properties are more influenced by the low proton beta; the intervening inertial range appears independent of both ICME features, indicative of a system-independent scaling of the turbulence.
AU - Good,SW
AU - Rantala,OK
AU - Jylhä,AM
AU - Chen,CHK
AU - Möstl,C
AU - Kilpua,EKJ
DO - 2041-8213/acfd1c
PY - 2023///
SN - 2041-8205
TI - Turbulence Properties of Interplanetary Coronal Mass Ejections in the Inner Heliosphere: Dependence on Proton Beta and Flux Rope Structure
T2 - Astrophysical Journal Letters
UR - http://dx.doi.org/10.3847/2041-8213/acfd1c
VL - 956
ER -