331 citations · 665 across the 18 of their papers we have counts for
18 papers
FOXSI-2: Upgrades of the Focusing Optics X-ray Solar Imager for its Second Flight
Steven Christe, Lindsay Glesener, Camilo Buitrago-Casas +12
The Focusing Optics X-ray Solar Imager (FOXSI) sounding rocket payload flew for the second time on 2014 December 11. To enable direct Hard X-Ray (HXR) imaging spectroscopy, FOXSI m…
On the faintest solar coronal hard X-rays observed with FOXSI
Juan Camilo Buitrago-Casas, Lindsay Glesener, Steven Christe +23
Solar nanoflares are small eruptive events releasing magnetic energy in the quiet corona. If nanoflares follow the same physics as their larger counterparts, they should emit hard…
Automatic Detection of Occulted Hard X-ray Flares Using Deep-Learning Methods
Shin-nosuke Ishikawa, Hideaki Matsumura, Yasunobu Uchiyama +1
We present a concept for a machine-learning classification of hard X-ray (HXR) emissions from solar flares observed by the Reuven Ramaty High Energy Solar Spectroscopic Imager (RHE…
FOXSI-2 Solar Microflares II: Hard X-ray Imaging Spectroscopy and Flare Energetics
Juliana T. Vievering, Lindsay Glesener, P. S. Athiray +7
We study the nature of energy release and transfer for two sub-A class solar microflares observed during the second flight of the Focusing Optics X-ray Solar Imager (FOXSI-2) sound…
Use of a ray-tracing simulation to characterize ghost rays in the FOXSI rocket experiment
J. C. Buitrago-Casas, S. Christe, L. Glesener +12
Imaging X-rays by direct focusing offers greater sensitivity and a higher dynamic range compared to techniques based on indirect imaging. The Focusing Optics X-ray Solar Imager (FO…
FOXSI-2 Solar Microflares I : Multi-instrument Differential Emission Measure Analysis and Thermal Energies
P. S. Athiray, Juliana Vievering, Lindsay Glesener +8
In this paper we present the differential emission measures (DEMs) of two sub-A class microflares observed in hard X-rays (HXRs) by the FOXSI-2 sounding rocket experiment, on 2014…
Hot plasma in a quiescent solar active region as measured by RHESSI, XRT, and AIA
Shin-nosuke Ishikawa, Sam Krucker
This paper investigates a quiescent (non-flaring) active region observed on July 13, 2010 in EUV, SXR, and HXRs to search for a hot component that is speculated to be a key signatu…
CLASP Constraints on the Magnetization and Geometrical Complexity of the Chromosphere-Corona Transition Region
J. Trujillo Bueno, J. Štěpán, L. Belluzzi +25
The Chromospheric Lyman-Alpha Spectro-Polarimeter (CLASP) is a suborbital rocket experiment that on 3rd September 2015 measured the linear polarization produced by scattering proce…
A Statistical Inference Method for Interpreting the CLASP Observations
J. Stepan, J. Trujillo Bueno, L. Belluzzi +25
On 3rd September 2015, the Chromospheric Lyman-Alpha SpectroPolarimeter (CLASP) successfully measured the linear polarization produced by scattering processes in the hydrogen Lyman…
Hard X-Ray Constraints on Small-Scale Coronal Heating Events
Andrew J. Marsh, David M. Smith, Lindsay Glesener +7
Much evidence suggests that the solar corona is heated impulsively, meaning that nanoflares may be ubiquitous in quiet and active regions (ARs). Hard X-ray (HXR) observations with…
High-speed X-ray imaging spectroscopy system with Zynq SoC for solar observations
Shin-nosuke Ishikawa, Tadayuki Takahashi, Shin Watanabe +7
We have developed a system combining a back-illuminated Complementary-Metal-Oxide-Semiconductor (CMOS) imaging sensor and Xilinx Zynq System-on-Chip (SoC) device for a soft X-ray (…
White paper of the "soft X-ray imaging spectroscopy"
Noriyuki Narukage, Shin-nosuke Ishikawa, Tomoko Kawate +2
The solar corona is full of dynamic phenomena, e.g., solar flares, micro flares in active regions, jets in coronal holes and in the polar regions, X-ray bright points in quiet regi…
Discovery of Scattering Polarization in the Hydrogen Lyman- Line of the Solar Disk Radiation
R. Kano, J. Trujillo Bueno, A. Winebarger +25
There is a thin transition region (TR) in the solar atmosphere where the temperature rises from 10,000 K in the chromosphere to millions of degrees in the corona. Little is known a…
Exploring impulsive solar magnetic energy release and particle acceleration with focused hard X-ray imaging spectroscopy
Steven Christe, Samuel Krucker, Lindsay Glesener +37
How impulsive magnetic energy release leads to solar eruptions and how those eruptions are energized and evolve are vital unsolved problems in Heliophysics. The standard model for…
Fine-pitch CdTe detector for hard X-ray imaging and spectroscopy of the Sun with the FOXSI rocket experiment
S. Ishikawa, M. Katsuragawa, S. Watanabe +8
We have developed a fine-pitch hard X-ray (HXR) detector using a cadmium telluride (CdTe) semiconductor for imaging and spectroscopy for the second launch of the Focusing Optics So…
Fine-pitch semiconductor detector for the FOXSI mission
Shin-nosuke Ishikawa, Shinya Saito, Hiroyasu Tajima +11
The Focusing Optics X-ray Solar Imager (FOXSI) is a NASA sounding rocket mission which will study particle acceleration and coronal heating on the Sun through high sensitivity obse…
Constraining Hot Plasma in a Non-flaring Solar Active Region with FOXSI Hard X-ray Observations
Shin-nosuke Ishikawa, Lindsay Glesener, Steven Christe +6
We present new constraints on the high-temperature emission measure of a non-flaring solar active region using observations from the recently flown Focusing Optics X-ray Solar Imag…
In-Orbit Performance of the Hard X-ray Detector on board Suzaku
M. Kokubun, K. Makishima, T. Takahashi +52
The in-orbit performance and calibration of the Hard X-ray Detector (HXD) on board the X-ray astronomy satellite Suzaku are described. Its basic performances, including a wide ener…