Ronald F. Elsner
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View article: Optics for the imaging x-ray polarimetry explorer
Optics for the imaging x-ray polarimetry explorer Open
The Imaging X-ray Polarimetry Explorer, a NASA small explorer mission, will be the first mission dedicated to x-ray polarimetry. The payload consists of three identical telescopes, each comprising a mirror module assembly (MMA) with a pola…
View article: X-Ray Emission from Jupiter’s Galilean Moons: A Tool for Determining Their Surface Composition and Particle Environment
X-Ray Emission from Jupiter’s Galilean Moons: A Tool for Determining Their Surface Composition and Particle Environment Open
We analyze archival Chandra X-ray Observatory observations of Jupiter to search for emission from the Galilean moons. X-ray emission has previously been reported from Io and Europa using a subset of these data. We confirm this detection, a…
View article: Comparisons Between Jupiter's X‐ray, UV and Radio Emissions and In‐Situ Solar Wind Measurements During 2007
Comparisons Between Jupiter's X‐ray, UV and Radio Emissions and In‐Situ Solar Wind Measurements During 2007 Open
We compare Chandra and XMM‐Newton X‐ray observations of Jupiter during 2007 with a rich multi‐instrument data set including upstream in situ solar wind measurements from the New Horizons spacecraft, radio emissions from the Nançay Decametr…
View article: Jupiter's X‐ray Emission During the 2007 Solar Minimum
Jupiter's X‐ray Emission During the 2007 Solar Minimum Open
The 2007–2009 solar minimum was the longest of the space age. We present the first of two companion papers on Chandra and XMM‐Newton X‐ray campaigns of Jupiter through February–March 2007. We find that low solar X‐ray flux during solar min…
View article: Lynx x-ray optics based on thin monolithic shells: design and development
Lynx x-ray optics based on thin monolithic shells: design and development Open
Lynx is the future x-ray observatory with superb imaging capabilities (<1 arc sec half-energy width) and large throughput (2 m2 effective area @ 1 keV), which is being considered in the U.S. to take over Chandra. The implementation of the …
View article: Full-shell x-ray optics development at NASA Marshall Space Flight Center
Full-shell x-ray optics development at NASA Marshall Space Flight Center Open
NASA's Marshall Space Flight Center (MSFC) maintains an active research program toward the development of high-resolution, lightweight, grazing-incidence x-ray optics to serve the needs of future x-ray astronomy missions such as Lynx. MSFC…
View article: X-rays Studies of the Solar System
X-rays Studies of the Solar System Open
X-ray observatories contribute fundamental advances in Solar System studies by probing Sun-object interactions, developing planet and satellite surface composition maps, probing global magnetospheric dynamics, and tracking astrochemical re…
View article: Assessing Quasi‐Periodicities in Jovian X‐Ray Emissions: Techniques and Heritage Survey
Assessing Quasi‐Periodicities in Jovian X‐Ray Emissions: Techniques and Heritage Survey Open
Jupiter's auroral X‐rays are rather mysterious, with an unknown driver, and several previous reports of individual cases of quasi‐periodic emission. In this work we revisit heritage X‐ray data sets from the 1990s to 2015 and apply robust s…
View article: The Imaging X-ray Polarimetry Explorer (IXPE): technical overview
The Imaging X-ray Polarimetry Explorer (IXPE): technical overview Open
The Imaging X-ray Polarimetry Explorer (IXPE) will expand the information space for study of cosmic sources, by adding linear polarization to the properties (time, energy, and position) observed in x-ray astronomy. Selected in 2017 January…
View article: Toward large-area sub-arcsecond x-ray telescopes II
Toward large-area sub-arcsecond x-ray telescopes II Open
In order to advance significantly scientific objectives, future x-ray astronomy missions will likely call for x-ray telescopes with large aperture areas (≈3 m[superscript 2]) and fine angular resolution (≈1[superscript 2 ]). Achieving such…
View article: The Imaging X-ray Polarimetry Explorer (IXPE)
The Imaging X-ray Polarimetry Explorer (IXPE) Open
The Imaging X-ray Polarimetry Explorer (IXPE) is an exciting international collaboration for a scientific mission that dramatically brings together the unique talents of the partners to expand observation space by simultaneously adding pol…
View article: Jupiter's X‐ray and EUV auroras monitored by Chandra, XMM‐Newton, and Hisaki satellite
Jupiter's X‐ray and EUV auroras monitored by Chandra, XMM‐Newton, and Hisaki satellite Open
Jupiter's X‐ray auroral emission in the polar cap region results from particles which have undergone strong field‐aligned acceleration into the ionosphere. The origin of precipitating ions and electrons and the time variability in the X‐ra…
View article: The impact of an ICME on the Jovian X‐ray aurora
The impact of an ICME on the Jovian X‐ray aurora Open
We report the first Jupiter X‐ray observations planned to coincide with an interplanetary coronal mass ejection (ICME). At the predicted ICME arrival time, we observed a factor of ∼8 enhancement in Jupiter's X‐ray aurora. Within 1.5 h of t…
View article: X-ray optics at NASA Marshall Space Flight Center
X-ray optics at NASA Marshall Space Flight Center Open
NASA's Marshall Space Flight Center (MSFC) engages in research, development, design, fabrication, coating, assembly, and testing of grazing-incidence optics (primarily) for x-ray telescope systems. Over the past two decades, MSFC has refin…
View article: SuperHERO: Design of a new hard-X-ray focusing telescope
SuperHERO: Design of a new hard-X-ray focusing telescope Open
SuperHERO is a hard x-ray (20-75 keV) balloon-borne telescope, currently in its proposal phase, that will utilize high angular-resolution grazing-incidence optics, coupled to novel CdTe multi-pixel, fine-pitch (250 micrometers) detectors. …
View article: HIGH-TIME-RESOLUTION MEASUREMENTS OF THE POLARIZATION OF THE CRAB PULSAR AT 1.38 GHz
HIGH-TIME-RESOLUTION MEASUREMENTS OF THE POLARIZATION OF THE CRAB PULSAR AT 1.38 GHz Open
Using the Westerbork Synthesis Radio Telescope (WSRT), we obtained\nhigh-time-resolution measurements of the full (linear and circular)\npolarization of the Crab pulsar. Taken at a resolution of 1/8192 of the 34-ms\npulse period (i.e., $4.…