A5022483961- Solar and Space Plasma Dynamics
- Stellar, planetary, and galactic studies
- Calibration and Measurement Techniques
- Astro and Planetary Science
- Advanced X-ray Imaging Techniques
- X-ray Spectroscopy and Fluorescence Analysis
- Ionosphere and magnetosphere dynamics
- Nuclear Physics and Applications
- Photocathodes and Microchannel Plates
- Planetary Science and Exploration
- Astrophysical Phenomena and Observations
- Particle Detector Development and Performance
- Geomagnetism and Paleomagnetism Studies
- CCD and CMOS Imaging Sensors
- Spacecraft Design and Technology
- Advanced X-ray and CT Imaging
- Climate change and permafrost
- Atmospheric Ozone and Climate
- High-pressure geophysics and materials
- Image Processing and 3D Reconstruction
- Dental Radiography and Imaging
- Spacecraft and Cryogenic Technologies
- Statistical and numerical algorithms
- Advanced Optical Sensing Technologies
- Particle accelerators and beam dynamics
Marshall Space Flight Center
2014-2024
University of Alabama in Huntsville
2014-2017
University of Alabama
2014
Florida Institute of Technology
2013
Abstract The third flight of the High-Resolution Coronal Imager (Hi-C 2.1) occurred on May 29, 2018; Sounding Rocket was launched from White Sands Missile Range in New Mexico. instrument has been modified its original configuration 1) to observe solar corona a passband that peaks near 172 Å, and uses new, custom-built low-noise camera. targeted Active Region 12712, captured 78 images at cadence 4.4 s (18:56:22 – 19:01:57 UT; 5 min 35 observing time). image spatial resolution varies due...
There is a thin transition region (TR) in the solar atmosphere where temperature rises from 10,000 K chromosphere to millions of degrees corona. Little known about mechanisms that dominate this enigmatic other than magnetic field plays key role. The magnetism TR can only be detected by polarimetric measurements few ultraviolet (UV) spectral lines, Lyman-$\alpha$ line neutral hydrogen at 121.6 nm (the strongest UV spectrum) being particular interest given its sensitivity Hanle effect...
The Extreme-ultraviolet Stellar Characterization for Atmospheric Physics and Evolution (ESCAPE) mission is an astrophysics Small Explorer employing ultraviolet spectroscopy (EUV: 80 to 825 Å FUV: 1280 1650 Å) explore the high-energy radiation environment in habitable zones around nearby stars. ESCAPE provides first comprehensive study of stellar EUV coronal mass ejection environments that directly impact habitability rocky exoplanets. In a 20-month science mission, will provide essential...
The Marshall Grazing Incidence X-ray Spectrometer (MaGIXS) sounding rocket experiment launched on July 30, 2021 from the White Sands Missile Range in New Mexico. MaGIXS is a unique solar observing telescope developed to capture spectral images, 6 - 24 Angstrom wavelength range, of coronal active regions. Its novel design takes advantage recent technological advances related fabricating and optimizing optical systems as well breakthroughs inversion methodologies necessary create spectrally...
ABSTRACT High-cadence observations by the slit-jaw (SJ) optics system of sounding rocket experiment known as Chromospheric Lyman Alpha Spectropolarimeter (CLASP) reveal ubiquitous intensity disturbances that recurrently propagate in either chromosphere or transition region both at a speed much higher than sound. The CLASP/SJ instrument provides time series two-dimensional images taken with broadband filters centered on Ly α line 0.6 s cadence. multiple fast-propagating appear quiet Sun and...
The Marshall Grazing Incidence X-ray Spectrometer (MaGIXS) is a sounding rocket instrument that flew on July 30, 2021 from the White Sands Missile Range, NM. was designed to address specific science questions require differential emission measures of solar soft spectrum 6 – 25[Formula: see text]Å(0.5 2.1[Formula: text]keV). MaGIXS comprises Wolter-I telescope, slit-jaw imaging system, an identical pair grazing incidence paraboloid mirrors, planar grating and CCD camera. While implementing...
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 needs future astronomy missions such as Lynx. MSFC efforts include both direct fabrication (diamond turning and deterministic computer-controlled polishing) mirror shells replication (from figured, polished mandrels). Both techniques produce full-circumference monolithic (primary + secondary) that share advantages...
Abstract The Chromospheric Lyman-Alpha Spectro-Polarimeter is a sounding rocket experiment that has provided the first successful measurement of linear polarization produced by scattering processes in hydrogen Ly α line (121.57 nm) radiation solar disk. In this paper, we report Si iii at 120.65 nm also shows and compare signals observed lines order to search for observational signatures Hanle effect. We focus on four selected bright structures investigate how U / I spatial variations vary...
Abstract The relative amount of high-temperature plasma has been found to be a useful diagnostic determine the frequency coronal heating on sub-resolution structures. When loops are infrequently heated, broad emission measure (EM) over wider range temperatures is expected. A narrower EM expected for high-frequency where closer equilibrium. soft X-ray spectrum contains many spectral lines that provide diagnostics, including from Fe xvii – xix . This region solar will observed by Marshall...
Abstract Nanoflares are thought to be one of the prime candidates that can heat solar corona its multimillion kelvin temperature. Individual nanoflares difficult detect with present generation instruments, but their presence inferred by comparing simulated nanoflare-heated plasma emissions observed emission. Using HYDRAD coronal loop simulations, we model emission from an X-ray bright point (XBP) Marshall Grazing Incidence Spectrometer (MaGIXS), along nearest available observations...
The Marshall Grazing Incidence X-ray Spectrometer (MaGIXS) is a NASA sounding rocket instrument designed to obtain spatially resolved soft spectra of the solar atmosphere in 6–24 Å (0.5–2.0 keV) range. consists single shell Wolter Type-I telescope, slit, and spectrometer comprising matched pair grazing incidence parabolic mirrors planar varied-line space diffraction grating. achieve 50 mÅ spectral resolution 5 arcsecond spatial along ±4-arcminute long launch planned for 2019. We report on...
NASA / MSFC has made new full-shell NiCo replicated hard X-ray optics for the fourth flight of Focusing Optics Solar Imager sounding rocket set to observe sun in March 2023. The FOXSI-4 high resolution were using enhanced mandrel polishing techniques incorporating a Zeeko CNC deterministic machine and an improved module assembly station with in-situ metrology. will fly three 2-meter focal length mirror modules two shells each. previous FOXSI-3 achieved angular 20 arcsec HPD (5 FWHM)...
Advancements in computer-controlled polishing, metrology, and replication have led to an x-ray mirror fabrication process that is capable of producing high-resolution Wolter microscopes. We present the test a nickel-cobalt replicated full-shell was electroformed from finely figured polished mandrel. This mandrel designed for 8-m source-to-detector-distance microscope, with 10× magnification, optimized reduce shell distortions occur within 20 mm ends. This, combination improved tooling design...
The NASA Marshall Space Flight Center (MSFC) has developed a science camera suitable for sub-orbital missions observations in the UV, EUV and soft X-ray. Six cameras will be built tested flight with Chromospheric Lyman-Alpha Spectro-Polarimeter (CLASP), joint National Astronomical Observatory of Japan (NAOJ) MSFC sounding rocket mission. goal CLASP mission is to observe scattering polarization Lyman-α detect Hanle effect line core. Due nature polarizationin chromosphere, strict...
Ubiquitous solar atmospheric coronal and transition region bright points (BPs) are compact features overlying strong concentrations of magnetic flux. Here, we utilize high-cadence observations from the Atmospheric Imaging Assembly on board Solar Dynamics Observatory to provide first extreme ultraviolet quiet-Sun (QS) network BP activity associated with sigmoidal structuring. To our knowledge, this previously unresolved fine structure has never been such small-scale QS events. This event...
The Marshall Grazing Incidence X-ray Spectrometer (MaGIXS) is a NASA sounding rocket instrument that designed to observe soft emissions from 24 - 6.0 Å (0.5 2.0 keV energies) in the solar atmosphere. For first time, high-temperature, low-emission plasma will be observed directly with 5 arcsecond spatial resolution and 22 mÅ spectral resolution. unique optical design consists of Wolter I telescope 3-optic grazing- incidence spectrometer. spectrometer utilizes finite conjugate mirror pair...
The FOXSI-4 sounding rocket will fly a significantly upgraded instrument in NASA's first solar are campaign. It deploy direct X-ray focusing optics which have revolutionized our understanding of astrophysical phenomena. For example, they allowed NuSTAR to provide imaging and IXPE (scheduled for launch 2021) polarization observations with detectors higher photon rate capability greater sensitivity than their predecessors. FOXSI is the dedicated mission using this method has demonstrated high...
Recently NASA Marshall Space Flight Center has made good progress in employing computer numerical control (CNC) polishing techniques on electroless nickel mandrels, as part of our replicated grazing incidence optics program. CNC afforded the ability to deterministically refine mandrel figure, therefore improving mirror performance. The Grazing Incidence X-ray Spectrometer (MaGIXS) is a MSFC-led sounding rocket instrument that comprises some first mirrors produced at MSFC using this...
Abstract The Chromospheric Lyman-Alpha Spectro-Polarimeter (CLASP) is a suborbital rocket experiment that on 2015 September 3 measured the linear polarization produced by scattering processes in hydrogen Ly α line of solar disk radiation. line-center photons this spectral radiation mostly stem from chromosphere-corona transition region (TR). These unprecedented spectropolarimetric observations revealed an interesting surprise, namely there practically no center-to-limb variation (CLV) Q / I...
The NASA Marshall Space Flight Center (MSFC) has developed a science camera suitable for sub-orbital missions observations in the UV, EUV and soft X-ray. Six cameras were built tested Chromospheric Lyman-Alpha Spectro-Polarimeter (CLASP), joint MSFC, National Astronomical Observatory of Japan (NAOJ), Instituto de Astrofisica Canarias (IAC) Institut D'Astrophysique Spatiale (IAS) sounding rocket mission. CLASP design includes frame-transfer e2v CCD57-10 512 × detector, dual channel...
Abstract The Marshall Grazing Incidence Spectrometer (MaGIXS) is a sounding rocket experiment that will observe the soft X-ray spectrum of Sun from 24 to 6.0 Å (0.5–2.0 keV) and scheduled for launch in 2021. Component- instrument-level calibrations MaGIXS instrument are carried out using Cryogenic Facility (XRCF) at NASA Space Flight Center. In this paper, we present calibration incident flux electron impact source with different targets XRCF CCD camera; photon was low enough enable its use...
Minimal observational evidence exists for fast transition region (TR) upflows in the presence of cool loops. Observations such occurrences challenge notions standard solar atmospheric heating models, as well their description bright TR emission. Using {\it EUV Imaging Spectrometer} (EIS) onboard Hinode}, we observe ($v_\lambda$\,$\le$\,$-$10 km s$^{-1}$) over multiple temperatures (5.8\,$\le$\,$\log T$\,$\le$ 6.0) at footpoint sites a loop ($\log T$\,$\le$\,6.0). Prior to energizing,...