The magnetic field is the main driver of the activity in the solar upper atmosphere, but its
measurement is notoriously difficult. In order to determine the magnetic field in the …

The middle corona, the region roughly spanning heliocentric distances from 1.5 to 6 solar
radii, encompasses almost all of the influential physical transitions and processes that …

This Letter addresses the first Solar Orbiter (SO)–Parker Solar Probe (PSP) quadrature,
occurring on 2021 January 18 to investigate the evolution of solar wind from the extended …

We present the first theoretical modeling of joint Parker Solar Probe (PSP)–Metis/Solar
Orbiter (SolO) quadrature observations. The combined observations describe the evolution …

An important aspect of solar energetic particle (SEP) events is their source populations.
Elemental abundance enhancements of impulsive SEP events, originating in presumed …

This Letter reports the first observational estimate of the heating rate in the slowly expanding
solar corona. The analysis exploits the simultaneous remote and local observations of the …

Recent in situ observations from the Parker Solar Probe (PSP) mission in the inner
heliosphere near perihelia show evidence of ion beams, temperature anisotropies, and …

This paper addresses the first direct investigation of the energy budget in the solar corona.
Exploiting joint observations of the same coronal plasma by Parker Solar Probe and the …

Mesoscale periodic structures observed in solar wind plasma serve as an important
diagnostic tool for constraining the processes that govern the formation of the solar wind …

Mesoscale density structures in the solar wind are often periodic, with f∼ 0.1–5 mHz. They
are trains of advected density structures with radial length scales of∼ 100–10,000 Mm …