Nariaki Nitta and Kentaro Yaji 1997 ApJ 484 927 doi:10.1086/304360
Nariaki Nitta1 and Kentaro Yaji2,3
Show affiliationsWe report the first solar flare for which direct X-ray imaging (with focusing optics) has shown the location of superhot (T ~ 30 MK) plasma. This flare consists of two separate loop structures. The smaller structure dominates the soft X-ray emission, but the longer structure develops with persistently higher temperatures, which overlaps with low-energy hard X-ray sources with very soft spectra. Using a two-temperature model, we describe how the soft X-ray images lead to the inference of superhot temperatures in the latter structure, as we combine three broadband measurements at slightly different effective wavelengths.
Issue 2 (1997 August 1)
Received 1996 September 23, accepted for publication 1997 February 28
Nariaki Nitta and Kentaro Yaji 1997 ApJ 484 927
Masanori Nishio et al. 1997 ApJ 489 976