Säm Krucker

TL;DR: The Focusing Optics X-ray Solar Imager (FOXSI) as mentioned in this paper was the first sounding rocket payload to use direct focusing optics for solar HXR observations and demonstrated the unique diagnostic power of focusing optics.

TL;DR: In this article, the authors used RHESSI's spatial and energy resolution to determine the combined chromospheric and coronal density profile of the flaring solar atmosphere in a statistical manner, using a data set of 838 flares observable in hard X-rays above 25 kV.

TL;DR: In this article, a simple analytical approach was used to compare two candidate mechanisms, the hydrogen recombination continuum (Paschen) and the Thomson scattering continuum due to scattering of disk radiation on flare electrons, which is typically enhanced during the impulsive phase of a flare as the result of collisional ionization (both thermal and nonthermal due to electron beams).

TL;DR: In this article, the authors reported the detection of a nonthermal electron distribution in a small solar microflare (GOES class A5.7) observed by the Nuclear Spectroscopic Telescope Array, with supporting observation by the Reuven Ramaty High Energy Solar Spectroscopy Imager (RHESSI).

TL;DR: In this article, a statistical study of partially occulted flares observed with RHESSI is presented, covering a large part of solar cycles 23 and 24, where the footpoints are occulted, revealing the spectrum and structure of the coronal loop-top source in X-rays.