High resolution soft X-ray spectroscopy and the quest for the hot (5–10 MK) plasma in solar active regions

Giulio Del Zanna, Vincenzo Andretta, Peter J. Cargill, Alain J. Corso, Adrian N. Daw, Leon Golub, James A. Klimchuk, Helen E. Mason

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

We discuss the diagnostics available to study the 5–10 MK plasma in the solar corona, which is key to understanding the heating in the cores of solar active regions. We present several simulated spectra, and show that excellent diagnostics are available in the soft X-rays, around 100 Å, as six ionization stages of Fe can simultaneously be observed, and electron densities derived, within a narrow spectral region. As this spectral range is almost unexplored, we present an analysis of available and simulated spectra, to compare the hot emission with the cooler component. We adopt recently designed multilayers to present estimates of count rates in the hot lines, with a baseline spectrometer design. Excellent count rates are found, opening up the exciting opportunity to obtain high-resolution spectroscopy of hot plasma.
Original languageEnglish
Article number638489
Number of pages19
JournalFrontiers in Astronomy and Space Sciences
Volume8
DOIs
Publication statusPublished - 12 Apr 2021

Keywords

  • Sun-active regions
  • Sun-atmosphere
  • X-ray
  • Spectroscopy
  • Coronal heating

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