Magnetic helicity, an intrinsic property of eruptive helical flux ropes (FRs) forming coronal mass ejections (CMEs), plays important role in determining CME geoeffectiveness. In the solar atmosphere and heliosphere, helicity remains conserved a closed volume. Considering this fact as basis our study, we perform quantitative comparison between total magnetic twisted interplanetary CMEs those tra...

Abstract We investigate the effects of evolutionary processes in internal magnetic structure two interplanetary coronal mass ejections (ICMEs) detected situ between 2020 November 29 and December 1 by Parker Solar Probe (PSP). The sources ICMEs were observed remotely at Sun EUV subsequently tracked to their counterparts white light. This period is particular interest community as it has been ide...

Context. One of the sources solar energetic particle (SEP) events is shocks that are driven by fast coronal mass ejections (CMEs). They can accelerate SEPs up to relativistic energies and attributed largest SEP events. New studies suggest CME-driven potentially electrons MeV in vicinity Sun. Aims. We focus on associated with strong interplanetary between 2007 2019 determine whether keep acceler...

Proton acceleration at a parallel coronal shock is modeled with self-consistent Alfvén wave excitation and shock transmission. 18 50 keV seed protons at 0.1% of plasma proton density are accelerated in 10 minutes to a power-law intensity spectrum rolling over at 300 MeV by a 2500km s−1 shock traveling outward from 3.5r , for typical coronal conditions and low ambient wave intensities. Interacti...

We consider a data assimilation technique for coupled ionospheric and thermospheric dynamics. The Global Ionosphere-Thermosphere Model (GITM) is used to simulate the ionospheric and thermospheric dynamics, and evaluate the performance of the data assimilation scheme that estimates the ion densities and flow speeds. This estimation technique is based on the state dependent Riccati equation (SDRE...

We apply the ring diagram technique to source regions of halo coronal mass ejections (CMEs) to study changes in acoustic mode parameters before, during, and after the onset of CMEs. We find that CME regions associated with a low value of magnetic flux have line widths smaller than the quiet regions implying a longer life-time for the oscillation modes. We suggest that this criterion may be used...

The aim of this study was to evaluate the localization of collagen modifying enzymes (CMEs) on fibroblastic reticular cells (FRCs) and follicular dendritic cells (FDCs) in non-neoplastic lymphoid tissues and various malignant lymphomas. The expression of prolyl 4-hydroxylase 1 (P4H1), lysyl hydroxylase 3 (LH3), and protein disulfide isomerase (PDI) was frequently observed on FRCs and FDCs in th...

Abstract In this article, we compare the properties of two coronal mass ejections (CMEs) that show similar source region characteristics but different evolutionary behaviors in later phases. We discuss events terms their near-Sun characteristics, interplanetary evolution and geoeffectiveness. carefully analyzed initiation propagation parameters these to establish precise CME-interplanetary CME ...

Abstract One of the earliest indicators importance shock acceleration solar energetic particles (SEPs) was broad spatial extent “gradual” SEP events produced as waves, driven by wide, fast coronal mass ejections (CMEs), expand across Sun with cross-field transport mediated shocks. Contrasting “impulsive” events, characteristic enhancements 3 He and heavy elements, are now associated magnetic re...

Interacting coronal mass ejections (CMEs) have been commonly reported during the STEREO era. With interaction of CMEs in heliosphere, it is expected that participating will either merge to form a single interplanetary CME (ICME) or arrive as distinct entities ICMEs at 1 AU. Previous studies focused on situ observations solar wind, i.e., plasma and magnetic field properties understand nature CME...