Comparative statistical study of characteristics of plasma in planar and non-planar ICME sheaths during solar cycles 23 and 24

Author:

Shaikh Zubair I1ORCID,Raghav Anil N2ORCID,Vichare Geeta1,Bhaskar Ankush34,Mishra Wageesh5

Affiliation:

1. Indian Institute of Geomagnetism (IIG), New Panvel, Navi, Mumbai 410218, India

2. University Department of Physics, University of Mumbai, Vidyanagari, Santacruz (E), Mumbai 400098, India

3. Heliophysics Science Division, NASA/Goddard Space Flight Center, Greenbelt, MD, USA

4. University Corporation for Atmospheric Research, Boulder, CO, USA

5. Max Planck Institute for Solar System Research, Justus-von-Liebig-Weg 3, 37077 Göttingen, Germany

Abstract

ABSTRACT Planar magnetic structures (PMS) are often observed in sheath regions driven by interplanetary coronal mass ejections (ICMEs) and in corotating interaction regions (CIRs). Here, we study plasma properties statistically within planar and non-planar ICME sheath regions using in situ data from the Advanced Composition Explore (ACE) spacecraft. The study includes 420 ICME-driven sheaths from 1998–2017. We found that 146 ($\sim 35{{\ \rm per\ cent}}$) ICME-driven sheaths are planar, whereas 274 ($\sim 65{{\ \rm per\ cent}}$) are non-planar. This study found that the average plasma temperature, density, speed, plasma beta, thermal pressure and magnetic pressure are higher in planar sheaths than in non-planar sheaths. This implies that high compression plays an essential role in the formation of PMS in sheath regions. Interestingly, our analysis reveals explicitly that the strength of the southward/northward magnetic field component is almost double in planar sheath regions compared with non-planar sheath regions. This suggests that planar sheaths are more geoeffective than non-planar sheaths.

Funder

Langley Research Center

National Aeronautics and Space Administration

Publisher

Oxford University Press (OUP)

Subject

Space and Planetary Science,Astronomy and Astrophysics

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