Seminar: Bursts and bombs in the solar atmosphere

We welcome Chris Nelson from ESTEC. He is visiting the STCE to collaborate on EUI alignment and the study of campfires. EUI is an EUV imager onboard of Solar Orbiter studying the sun.

His seminar is about: Bursts and bombs in the solar atmosphere  

Abstract: Localised transient brightenings occur ubiquitously throughout the solar atmosphere, from the photosphere to the corona. These events go by many names including bursts and bombs, and are thought to be primarily driven by magnetic reconnection, the rapid and explosive reconstruction of the local magnetic field. Although we know that such magnetic reconnection can cause extreme heating of the local plasma in small (European country sized) regions, we still do not know whether this process occurs enough to sustain multi-million degree temperatures over entire the solar corona (known as the coronal heating problem). In this talk, we discuss recent work undertaken with the aim of tackling this problem, using data from the Interface Region Imaging Spectrograph (IRIS) and Solar Orbiter satellites. Our large-scale statistical analysis investigates the fundamental properties of the signatures of magnetic reconnection at temperatures ranging from the photosphere (∼6000 K) to the corona (>1000000 K) at various positions across the solar surface (including in active regions and the quiet Sun). This comprehensive research allows us to make important inferences about the importance of magnetic reconnection in answering the coronal heating problem. We find that at any given time magnetic reconnection signatures are found to cover approximately 0.02% of the solar corona, an area around 239 times the surface area of the Earth, suggesting that this signature has the potential to play an important role in the constant energy deposition required in the upper solar atmosphere to account for corona heating.

When: Thursday February 2, 10:30

Where: Meridian room at the Royal Observatory of Belgium or on zoom:


the STCE on behalf of Cis Verbeeck


Thursday, February 2, 2023 - 10:30 to 11:30

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