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Deriving CME Density From Remote Sensing Data and Comparison to In Situ Measurements

Temmer, M.; Veronig, A. M.; Vršnak, B. +8 more

We determine the three dimensional geometry and deprojected mass of 29 well observed coronal mass ejections (CMEs) and their interplanetary counterparts (ICMEs) using combined Solar Terrestrial Relations Observatory Solar and Heliospheric Observatory white light data. From the geometry parameters, we calculate the volume of the CME for the magneti…

Magnetic Structure and Propagation of Two Interacting CMEs From the Sun to Saturn

Provan, Gabrielle; Möstl, Christian; Futaana, Yoshifumi +14 more

One of the grand challenges in heliophysics is the characterization of coronal mass ejection (CME) magnetic structure and evolution from eruption at the Sun through heliospheric propagation. At present, the main difficulties are related to the lack of direct measurements of the coronal magnetic fields and the lack of 3D in-situ measurements of the…

Magnetic Reconnection Within the Boundary Layer of a Magnetic Cloud in the Solar Wind

Nakamura, Rumi; Narita, Yasuhito; Vörös, Zoltán. +5 more

The twisted local magnetic field at the front or rear regions of the magnetic clouds (MCs) associated with interplanetary coronal mass ejections (ICMEs) is often nearly opposite to the direction of the ambient interplanetary magnetic field. There is also observational evidence for magnetic reconnection (MR) outflows occurring within the boundary l…

Quantitative Assessment of Protons During the Solar Proton Events of September 2017

Pandya, Megha; Bhaskara, Veenadhari

We present multi-spacecraft observations of the proton fluxes spanning from 1.5 to 433 MeV for the largest solar proton event of solar cycle 24, i.e., September 7 and 10, 2017. In September 2017, M5.5 flare on September 4, X9.3 flare on September 6 and X8.2 flare on September 10 gave rise to solar proton event when observed by near-Earth spacecraf…