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Solar Flares and Alan Gabriel. by G. A. Doschek Space Science Division Naval Research Laboratory Presented at Atomic physics, plasma spectroscopy, and solar physics from space: Celebrating the achievements of Alan Gabriel

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solar flares and alan gabriel

Solar Flares and Alan Gabriel

by

G. A. Doschek

Space Science Division

Naval Research Laboratory

Presented at

Atomic physics, plasma spectroscopy, and solar physics from space: Celebrating the achievements of Alan Gabriel

Institut d’Astrophysique SpatialeCNRS-Université Paris-SudOrsay, France20 June 2013

presented by video link from Washington, DC, USA

Work supported by 6.1 NRL/ONR funds

the x ray spectrum of solar flares
The X-ray Spectrum of Solar Flares
  • Alan made seminal contributions towards understanding the X-ray spectrum of solar flares, particularly the so-called “satellite lines” produced by dielectronic recombination and electron impact excitation.
  • A. H. Gabriel – “Dielectronic Satellite

Spectra for Highly-Charged Helium-like Ion Lines, Mon. Not. R. astr. Soc., 160, 99 (1972)

529 citations as of 17 June 2013

slide4

The NASA OSOs and Solar Maximum Mission, the Japanese

Hinotori Mission and the US DoD P78-1 Mission

slide8

Non-thermal

motions in

flares

slide9

But alas, it is rather tragic that the high spectral resolution X-ray investigation of flares ceased after Yohkoh!

However, highly ionized iron

lines appear in the EUV, where

spectral-imaging with multi-layer optics can be used (SOHO/CDS, Hinode/EIS)

what next with highly ionized iron lines
What Next with Highly Ionized Iron Lines?
  • We need sensitive imaging X-ray spectrometers that can observe the Fe XXV + satellite lines near 1.9 Å and the Fe XXVI + satellite lines near 1.8 Å in the reconnection region.
    • More sensitive Bragg spectrometers with imaging capabilities?
    • Microcalorimeters?
  • We need more sensitive and higher spatial resolution EIS-type instruments (Solar-C?) with hard X-ray imaging observations (advanced RHESSI?)
  • Summary: Alan Gabriel was a key individual in the ground floor investigation of the high temperature components of solar flares
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