Transient Inverse-FIP Plasma Composition Evolution within a Solar Flare

Deborah Baker, Lidia Van Driel-Gesztelyi, David H. Brooks, Gherardo Valori, Alexander W. James, J. Martin Laming, David M. Long, Pascal Démoulin, Lucie M. Green, Sarah A. Matthews, K. Oláh, Zsolt Kovári

Research output: Contribution to journalArticle

Abstract

Understanding elemental abundance variations in the solar corona provides an insight into how matter and energy flow from the chromosphere into the heliosphere. Observed variations depend on the first ionization potential (FIP) of the main elements of the Sun's atmosphere. High-FIP elements (>10 eV) maintain photospheric abundances in the corona, whereas low-FIP elements have enhanced abundances. Conversely, inverse FIP (IFIP) refers to the enhancement of high-FIP or depletion of low-FIP elements. We use spatially resolved spectroscopic observations, specifically the Ar xiv/Ca xiv intensity ratio, from Hinode's Extreme-ultraviolet Imaging Spectrometer to investigate the distribution and evolution of plasma composition within two confined flares in a newly emerging, highly sheared active region. During the decay phase of the first flare, patches above the flare ribbons evolve from the FIP to the IFIP effect, while the flaring loop tops show a stronger FIP effect. The patch and loop compositions then evolve toward the preflare basal state. We propose an explanation of how flaring in strands of highly sheared emerging magnetic fields can lead to flare-modulated IFIP plasma composition over coalescing umbrae which are crossed by flare ribbons. Subsurface reconnection between the coalescing umbrae leads to the depletion of low-FIP elements as a result of an increased wave flux from below. This material is evaporated when the flare ribbons cross the umbrae. Our results are consistent with the ponderomotive fractionation model for the creation of IFIP-biased plasma.

Original languageEnglish
Article number35
JournalAstrophysical Journal
Volume875
Issue number1
DOIs
Publication statusPublished - Apr 10 2019

Fingerprint

plasma composition
solar flares
ionization potentials
ionization
plasma
flares
ribbons
coalescing
corona
emerging
depletion
ultraviolet spectrometers
heliosphere
chromosphere
solar corona
imaging spectrometers
energy flow
fractionation
strands
coronas

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Baker, D., Van Driel-Gesztelyi, L., Brooks, D. H., Valori, G., James, A. W., Martin Laming, J., ... Kovári, Z. (2019). Transient Inverse-FIP Plasma Composition Evolution within a Solar Flare. Astrophysical Journal, 875(1), [35]. https://doi.org/10.3847/1538-4357/ab07c1

Transient Inverse-FIP Plasma Composition Evolution within a Solar Flare. / Baker, Deborah; Van Driel-Gesztelyi, Lidia; Brooks, David H.; Valori, Gherardo; James, Alexander W.; Martin Laming, J.; Long, David M.; Démoulin, Pascal; Green, Lucie M.; Matthews, Sarah A.; Oláh, K.; Kovári, Zsolt.

In: Astrophysical Journal, Vol. 875, No. 1, 35, 10.04.2019.

Research output: Contribution to journalArticle

Baker, D, Van Driel-Gesztelyi, L, Brooks, DH, Valori, G, James, AW, Martin Laming, J, Long, DM, Démoulin, P, Green, LM, Matthews, SA, Oláh, K & Kovári, Z 2019, 'Transient Inverse-FIP Plasma Composition Evolution within a Solar Flare', Astrophysical Journal, vol. 875, no. 1, 35. https://doi.org/10.3847/1538-4357/ab07c1
Baker D, Van Driel-Gesztelyi L, Brooks DH, Valori G, James AW, Martin Laming J et al. Transient Inverse-FIP Plasma Composition Evolution within a Solar Flare. Astrophysical Journal. 2019 Apr 10;875(1). 35. https://doi.org/10.3847/1538-4357/ab07c1
Baker, Deborah ; Van Driel-Gesztelyi, Lidia ; Brooks, David H. ; Valori, Gherardo ; James, Alexander W. ; Martin Laming, J. ; Long, David M. ; Démoulin, Pascal ; Green, Lucie M. ; Matthews, Sarah A. ; Oláh, K. ; Kovári, Zsolt. / Transient Inverse-FIP Plasma Composition Evolution within a Solar Flare. In: Astrophysical Journal. 2019 ; Vol. 875, No. 1.
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