17th European Solar Physics Meeting ESPM-17

Waves in coronal structures up to 1 Rsun?

10 Sept 2024, 09:55

15m

Turin, Italy

Talk Energy and mass transfer throughout the solar atmosphere and structures within Energy and mass transfer throughout the solar atmosphere and structures within

Speaker

David Berghmans (Royal Observatory of Belgium)

Description

At Solar Orbiter’s perihelion, the FSI telescope of the EUI instrument images the EUV corona up to 1 Rsun above the limb with a plate-scale better than 1000 km on the Sun. Here we report on exceptional FSI image sequences in the 17.4nm bandpass with deep exposures and a 30s cadence during the so-called “Density Fluctuations” and “Probe Quadrature” Solar Orbiter Observing Plans (SOOPs).

These data, with unique high S/N in the high EUV corona, reveal ubiquitous intensity fluctuations propagating outward along open magnetic field-lines up to 1 Rsun above the limb, well beyond the FOV of traditional EUV imagers. Difference movies suggest these propagating intensity fluctuations have both a longitudinal as well as a transversal “swaying” component.

We will discuss the relation of these high-altitude fluctuations with similar features reported before in the low solar corona (eg COMP & AIA data), as well as higher up in simultaneous Metis data. Implications for the energisation of the solar wind will be discussed.