6–10 Sept 2021
Online
Europe/Rome timezone

A statistical study of plasma composition in solar active regions

7 Sept 2021, 11:52
13m
Online

Online

Poster Session 2 - The Solar Atmosphere: Heating, Dynamics and Coupling Poster Session 4.3

Speaker

Ms Teodora Mihailescu (Mullard Space Science Laboratory, University College London, UK)

Description

The plasma in the solar corona originates from the photosphere and would, therefore, be expected to have similar elemental composition. However, elements with a low first ionisation potential (FIP) have been observed to have an increased abundance in certain regions of the corona. This phenomenon is known as the FIP effect and the degree of enhancement is measured using the FIP bias parameter. The increased elemental abundance is typically observed in active regions.

In this statistical study, we analyse how the degree of enhancement varies in active regions of different sizes, ages and level of complexity. We explore whether the average FIP bias is linked to the evolution of active regions and the photospheric magnetic field at the scale of an active region. First, by exploring whether there is a correlation between average FIP bias and the total magnetic flux and age of the active region. Second, if there is an average FIP bias dependence on magnetic flux density. Third, if the average FIP bias varies depending on whether the plasma is above the leading or following polarity of an active region.

Primary author

Ms Teodora Mihailescu (Mullard Space Science Laboratory, University College London, UK)

Co-authors

Dr Deborah Baker (Mullard Space Science Laboratory, University College London, UK) Prof. Lucie M. Green (Mullard Space Science laboratory, University College London, UK) Prof. Lidia Van Driel-Gesztelyi (Mullard Space Science Laboratory, University College London, UK; Observatoire de Paris, LESIA, France; Konkoly Observatory, Hungarian Academy of Sciences, Hungary) Prof. David H. Brooks (College of Science, George Mason University, VA, USA) Dr David M. Long (Mullard Space Science Laboratory, University College London, UK)

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