A5047227373- Solar and Space Plasma Dynamics
- Stellar, planetary, and galactic studies
- Astro and Planetary Science
- Solar Radiation and Photovoltaics
- Spacecraft and Cryogenic Technologies
- Ionosphere and magnetosphere dynamics
- Astronomy and Astrophysical Research
- Calibration and Measurement Techniques
- Adaptive optics and wavefront sensing
- Geomagnetism and Paleomagnetism Studies
- Photocathodes and Microchannel Plates
- CCD and CMOS Imaging Sensors
- Spacecraft Design and Technology
- Geophysics and Gravity Measurements
- Astronomical Observations and Instrumentation
- Spacecraft Dynamics and Control
- Computational Physics and Python Applications
- Scientific Research and Discoveries
- Galaxies: Formation, Evolution, Phenomena
- Optical Polarization and Ellipsometry
- Dark Matter and Cosmic Phenomena
- Particle Detector Development and Performance
- Photovoltaic System Optimization Techniques
- Geochemistry and Geologic Mapping
- Color Science and Applications
Goddard Space Flight Center
1997-2024
Catholic University of America
2023
Marshall Space Flight Center
2023
Laboratory for Atmospheric and Space Physics
2023
Center for Astrophysics Harvard & Smithsonian
2023
University of Colorado Boulder
2023
University of Illinois Urbana-Champaign
2023
Southwest Research Institute
2023
Predictive Science (United States)
2023
National Aeronautics and Space Administration
2020
The Extreme Ultraviolet Imager (EUVI) is part of the SECCHI instrument suite currently being developed for NASA STEREO mission. Identical EUVI telescopes on two spacecraft will study structure and evolution solar corona in three dimensions, specifically focus initiation early coronal mass ejections (CMEs). telescope at Lockheed Martin Solar Astrophysics Lab. investigation led by Naval Research EUVI's 2048 x pixel detectors have a field view out to 1.7 radii, observe four spectral channels...
We found an important piece of evidence for magnetic reconnection inflow in a flare on 1999 March 18. The occurred the northeast limb, displaying nice cusp-shaped soft X-ray loop and plasmoid ejection typical long-duration events. EUV observation same shows us bubble-like void ejection. core this corresponds to plasmoid. Moreover, as is ejected, occurs at disconnecting point. A clear ongoing pattern toward X-point seen. velocity apparent motion about 5 km s-1, which upper limit speed. Based...
The three-dimensional structure of solar active region NOAA 7986 observed on 1996 August 30 with the Extreme-Ultraviolet Imaging Telescope (EIT) board Solar and Heliospheric Observatory (SOHO) is analyzed. We develop a new method dynamic stereoscopy to reconstruct geometry dynamically changing loops, which allows us determine orientation mean loop plane respect line sight, prerequisite correct properly for projection effects in models. With this filter-ratio technique applied EIT 171 195 Å...
In this paper we study the three-dimensional structure of hot (Te ≈ 1.5-2.5 MK) loops in solar active region NOAA 7986, observed on 1996 August 30 with Extreme-ultraviolet Imaging Telescope (EIT) board Solar and Heliospheric Observatory (SOHO). This complements a first (Paper I) cooler 1.0-1.5 same region, using method Dynamic Stereoscopy to reconstruct geometry. We coordinates x(s), y(s), z(s), density ne(s), temperature profile Te(s) 35 individual loop segments (as function coordinate s)...
The SECCHI HI2 white-light imagers on the STEREO A and B spacecraft show systematically different proper motions of material moving outward from Sun in front high-speed solar wind streams coronal holes. As a group ejections enters eastern (A) field view, elements at rear appear to overrun front. (This is projection effect does not mean that actually merge.) opposite true western (B) field; run away rear. Elongation/time maps this as characteristic grouping tracks motion into convergent...
We explore new opportunities for solar physics that could be realized by future missions providing sustained observations from vantage points away the Sun-Earth line. These include far side of Sun, at high latitudes including over poles, or near-quadrature angles relative to Earth (e.g., L4 and L5 Lagrangian points). Such fill known holes in our scientific understanding three-dimensional, time-evolving Sun heliosphere, have potential open frontiers through discoveries enabled novel viewpoints.
SOHO EIT spectroheliograms showing the polar coronal holes during present sunspot minimum are compared with National Solar Observatory (Kitt Peak) magnetograms taken in Fe I λ8688 and Ca II λ8542. The chromospheric λ8542 magnetograms, obtained on a routine, near-daily basis since 1996 June, reveal Sun's strong fields remarkable clarity. We find that IX λ171 plumes occur where minority-polarity flux is contact of dominant polarity inside each hole. Moreover, locations "plume haze" coincide...
We observed NOAA Active Region 8108 around 1940 UT on 1997 November 18 with the Very Large Array and three instruments aboard NASA/ESA Solar Heliospheric Observatory satellite, including Coronal Diagnostic Spectrometer, EUV Imaging Telescope, Michelson Doppler Imager. used right-hand left-hand circularly polarized components of radio observing frequencies, along coordinated observations, to derive three-dimensional coronal magnetic field above region's sunspot its immediate surroundings....
The POLAR Investigation of the Sun (POLARIS) mission uses a combination gravity assist and solar sail propulsion to place spacecraft in 0.48 AU circular orbit around with an inclination 75 degrees respect equator. This challenging is made possible by development propulsion. first extended view high-latitude regions will enable crucial observations not from ecliptic viewpoint or Solar Orbiter. While Orbiter would give glimpse high latitude magnetic field flows probe dynamo, it does have...
We report on the Balloonborne Investigation of Temperature and Speed Electrons in corona (BITSE) mission launched recently to observe solar from about 3 Rs 15 at four wavelengths (393.5, 405.0, 398.7, 423.4 nm). The BITSE instrument is an externally occulted single stage coronagraph developed NASA's Goddard Space Flight Center collaboration with Korea Astronomy Science Institute (KASI). used a polarization camera that provided total brightness images size 1024 x pixels. Wallops Arc Second...
The Sun's corona, which is composed of plasma at a temperature few millions degrees, can be best viewed in two electromagnetic domains, one from wavelengths angstroms to hundreds (in the soft X-ray and EUV domain), other centimeters several tens radio domain). In this paper, we present quantitative comparison coronal observations made these domains with high spatial resolution over full disk Sun. were taken EIT (Extreme-Ultraviolet Imaging Telescope) on board SOHO (Solar Heliospheric...
Because of the orbit characteristics vast majority spacecraft, solar flux has predominantly been measured at Earth or least in plane ecliptic. Therefore, existing data do not directly demonstrate fact that latitudinal distribution extreme-ultraviolet (EUV) is largely anisotropic. Indeed, EUV nonuniform very contrasted bright features (i.e., active regions) and dark coronal holes) surface Sun produces both obvious rotational (or longitudinal) modulation also a strong anisotropy. Although...
Whitepaper #164 in the Decadal Survey for Solar and Space Physics (Heliophysics) 2024-2033. Main topics: space weather applications; basic research. Additional research/operations/research loop; solar physics; space-based missions/projects; inner […]
Whitepaper #333 in the Decadal Survey for Solar and Space Physics (Heliophysics) 2024-2033. Main topics: space weather applications; basic research. Additional research/operations/research loop; research/applications/operations pipeline; […]
The COronal Diagnostic EXperiment (CODEX) is a Heliophysics mission to measure the density, temperature, and velocity of electrons in solar corona with primary goal improving our understanding physical conditions wind acceleration region. temperature measurement requires much higher signal-to-noise ratio than density measurements. In coronagraphs, diffraction disk light due occulting element dominant source noise. Therefore, further suppress diffracted sun respect existing coronagraphs...
HECOR (HElium CORonagraph) is a coronagraph designed to observe the solar corona at 30.4 nm between 1.2 and 4 radii. The instrument part of Herschel sounding rocket payload be flown from White Sands Missile Range in December 2007. Much like for neutral hydrogen, residual singly ionized helium present can detected because it resonantly scatters intense underlying chromospheric radiation. Combined with simultaneous measurements hydrogen made by SCORE, other payload, observations will provide...
Detailed investigations of the corona and source regions solar wind have become possible with spectroscopic imaging instruments on Solar Heliospheric Observatory (SOHO). We present observations in extreme ultraviolet (EUV), pertinent to generation slow wind, which were obtained by Ultraviolet Measurements Emitted Radiation (SUMER) spectrograph Extreme-ultraviolet Imaging Telescope (EIT) early 1998 under relatively quiet conditions, but several active new cycle present. At same time,...
The High Inclination Solar Mission (HISM) is a concept for an out-of-the-ecliptic mission observing the Sun and heliosphere. profile largely based on Polar Imager concept: initially spiraling in to 0.48 AU ecliptic orbit, then increasing orbital inclination at rate of $\sim 10$ degrees per year, ultimately reaching heliographic $>$75 degrees. achieved using solar sails derived from technology currently being developed Cruiser mission, under development. HISM remote sensing instruments...
METIS, the Multi Element Telescope for Imaging and Spectroscopy, is an instrument proposed to European Space Agency be part of payload Solar Orbiter mission. The design has been conceived performing extreme ultraviolet (EUV) spectroscopy both on solar disk off-limb, near-Sun coronagraphy spectroscopy. suite consists three different interconnected elements, COR, EUS SOCS, sharing same optical bench, electronics, S/C heat shield aperture. COR a visible-EUV multiband coronagraph based classical...
Whitepaper #330 in the Decadal Survey for Solar and Space Physics (Heliophysics) 2024-2033. Main topics: basic research. Additional ground-based missions/projects; solar physics; space-based system science.