Annual Solar Motion And Spy Satellites,
2014
Utah State University
Annual Solar Motion And Spy Satellites, Margaret Jensen, Shane L. Larson
Browse All Undergraduate research
A topic often taught in introductory astronomy courses is the changing position of the Sun in the sky as a function of time of day, and season. The relevance and importance of this motion is explained in the context of seasons and the impact it has on human activities such as agriculture. The geometry of the ob- served motion in the sky is usually reduced to graphical representations and visualizations that can be difficult to render and grasp. Sometimes students are asked to observe the Suns changing motion and record their data, but this is a long-term project requiring several …
Updating And Revising Star Camera For Future Flights Of Balloon Borne Experiment,
2014
California State University - Sacramento
Updating And Revising Star Camera For Future Flights Of Balloon Borne Experiment, Krystle N. Sy, Seth Hillbrand
STAR Program Research Presentations
The BLAST (Balloon-borne Large Aperture Submillimeter Telescope) experiment surveys the galaxy from altitudes of 100,000 ft in order to answer important cosmological questions, such as how stars are formed. This experiment is conducted above Antarctica to minimize unwanted noise. Two star cameras are used in the navigation systems to identify known stars. The cameras take pictures and match stars in the image to known star positions from a catalog stored in the star camera's computer. This is done using code written in C++, a computer programming language. In order to modernize the system, the code needs to be updated. A …
Probing The Alfvén Speed Profile Using Type Ii Radio Bursts,
2014
Central Coast New Tech High
Probing The Alfvén Speed Profile Using Type Ii Radio Bursts, Peter Sullivan, Hazel M. Bain
STAR Program Research Presentations
Type II radio bursts can be produced when a coronal mass ejection (CME) traveling faster than the local plasma speed of the ambient medium produces a shock. From the drift rate of type II bursts it is possible to calculate the velocity of the CME. We present a statistical survey of type II radio burst events during 2012-2013. Using radio observations we determine speeds of CME shocks as a means of setting limits on the Alfvén speed profile of the interplanetary medium as a function of distance from the sun. In particular we use observations from the WAVES instruments onboard …
Landsat-8: Science And Product Vision For Terrestrial Global
Change Research,
2014
South Dakota State University
Landsat-8: Science And Product Vision For Terrestrial Global Change Research, David P. Roy, M. A. Wulder, T. R. Loveland, C. E. Woodcock, R. G. Allen, M. C. Anderson, D. Helder, J. R. Irons, D. M. Johnson, R. Kennedy, T. A. Scambos, C. B. Schaaf, J. R. Schott, Y. Sheng, E. F. Vermote, A. S. Belward, R. Bindschadler, W. B. Cohen, F. Gao, J. D. Hipple, P. Hostert, Desert Research Institute, Reno, Nv, C. O. Justice, Ayse Kilic, V. Kovalskyy, Z. P. Lee, L. Lymburner, J. G. Masek, J. Mccorkel, Y. Shuai, R. Trezza, J. Vogelmann, R. H. Wynne, Z. Zhu
School of Natural Resources: Faculty Publications
Landsat 8, a NASA and USGS collaboration, acquires global moderate-resolution measurements of the Earth's terrestrial and polar regions in the visible, near-infrared, short wave, and thermal infrared. Landsat 8 extends the remarkable 40 year Landsat record and has enhanced capabilities including new spectral bands in the blue and cirrus cloud-detection portion of the spectrum, two thermal bands, improved sensor signal-to-noise performance and associated improvements in radiometric resolution, and an improved duty cycle that allows collection of a significantly greater number of images per day. This paper introduces the current (2012–2017) Landsat Science Team's efforts to establish an initial understanding of …
Estimation Of Crop Gross Primary Production (Gpp): FaparChl Versus Mod15a2 Fpar,
2014
NASA, Greenbelt, MD
Estimation Of Crop Gross Primary Production (Gpp): FaparChl Versus Mod15a2 Fpar, Qingyuan Zhang, Yen-Ben Cheng, A. I. Lyapustin, Yujie Wang, Feng Gao, Andrew E. Suyker, Shashi B. Verma, Elizabeth M. Middleton
School of Natural Resources: Faculty Publications
Photosynthesis (PSN) is a pigment level process in which antenna pigments (predominately chlorophylls) in chloroplasts absorb photosynthetically active radiation (PAR) for the photochemical process. PAR absorbed by foliar non-photosynthetic components is not used for PSN. The fraction of PAR absorbed (fAPAR) by a canopy/vegetation (i.e., fAPARcanopy) derived from the Moderate Resolution Imaging Spectroradiometer (MODIS) images, referred to as MOD15A2 FPAR, has been used to compute absorbed PAR (APAR) for PSN (APARPSN) which is utilized to produce the standard MODIS gross primary production (GPP) product, referred to as MOD17A2 GPP. In this study, the fraction of PAR …
Orbital Solutions And Absolute Elements Of The Short-Period Eclipsing Binary Es Librae,
2014
Georgia State University
Orbital Solutions And Absolute Elements Of The Short-Period Eclipsing Binary Es Librae, Nicole E. Cabrera, James R. Sowell, Richard M. Williamon, Thomas F. Collins, Francis C. Fekel, Michael H. Williamson, Matthew W. Muterspaugh
Information Systems and Engineering Management Research Publications
We have obtained new differential UBV photoelectric photometry and radial velocities of both components of the short-period eclipsing binary ES Lib. The system has a circular orbit with a period of 0.883040928 days and is seen at an inclination of 70.1°. With the Wilson-Devinney analysis program, we obtained a simultaneous solution of our photometric and spectroscopic observations that resulted in masses of M1 = 2.30 ± 0.03 M⊙ and M2 = 0.97 ± 0.01 M⊙ and the equal-volume radii of R1 = 2.69 ± 0.02 R⊙ and R2 = 1.83 ± 0.01 R⊙ for the primary and secondary, respectively. The …
Dynamical Models Of Elliptical Galaxies – I. Simple Methods,
2014
University of Cambridge
Dynamical Models Of Elliptical Galaxies – I. Simple Methods, A. Angello, N. Evans, Aaron Romanowsky
Faculty Publications
We study dynamical models for elliptical galaxies, deriving the projected kinematic profiles in a form that is valid for general surface-brightness profiles and (spherical) total mass profiles, without the need for any explicit deprojection. We then show that an almost flat rotation curve, combined with modest velocity anisotropy, is already sufficient to recover the kinematic profiles of nearby ellipticals. As an application, we provide two different sets of mass estimators for elliptical galaxies, based on either the velocity dispersion at a specific location near the effective radius, or the aperture-averaged velocity dispersion. In the large aperture (virial) limit, mass estimators …
[Sabbatical Report],
2014
Western Kentucky University
[Sabbatical Report], Louis-Gregory Strolger
Sabbatical Reports
I spent my AY2014 sabbatical year at the Space Telescope Science Institute (STScI), with plans of completing the analyses of supernova rates for both thermonuclear and corecolliape events in high redshift galaxies from the Multi-cycle Treasury Projects with the Hubble Space Telescope.
Comparative Analysis Of A Transition Region Bright Point With A Blinker And Coronal Bright Point Using Multiple Eis Emission Lines,
2014
Trinity University
Comparative Analysis Of A Transition Region Bright Point With A Blinker And Coronal Bright Point Using Multiple Eis Emission Lines, N B. Orange, H M. Oluseyi, D L. Chesny, M Patel, K Hesterly, L Preuss, C Neira, Niescja E. Turner
Physics and Astronomy Faculty Research
Since their discovery 20 year ago, transition region bright points have never been observed spectroscopically. Bright point properties have not been compared with similar transition region and coronal structures. In this work we have investigated three transient quiet Sun brightenings including a transition region bright point (TR BP), a coronal bright point (CBP) and a blinker. We use time-series observations of the extreme-ultraviolet emission lines of a wide range of temperature T(logT=5.3 – 6.4) from the EUV Imaging Spectrometer (EIS) onboard the Hinode satellite. We present the EIS temperature maps and Doppler maps, which are compared with …
Studying Short-Period Comets And Long-Period Comets Detected By Wise/Neowise,
2014
University of Central Florida
Studying Short-Period Comets And Long-Period Comets Detected By Wise/Neowise, Emily Kramer
Electronic Theses and Dissertations
The Wide-field Infrared Survey Explorer (WISE) mission surveyed the sky in four infrared wavelength bands (3.4, 4.6, 12 and 22 μm) between January 2010 and February 2011. During the mission, WISE serendipitously observed 160 comets, including 21 newly discovered objects. About 89 of the comets observed by WISE displayed a significant dust tail in the 12 and 22 μm (thermal emission) bands, showing a wide range of activity levels and dust morphology. Since the observed objects are a mix of both long-period comets (LPCs) and short-period comets (SPCs), differences in their activity can be used to better understand the thermal …
Surface Plasmon Resonance Sensing Properties Of A 3d Nanostructure Consisting Of Aligned Nanohole And Nanocone Arrays,
2014
Western University
Surface Plasmon Resonance Sensing Properties Of A 3d Nanostructure Consisting Of Aligned Nanohole And Nanocone Arrays, Mohamadreza Najiminaini, Erden Ertorer, Bozena Kaminska, Silvia Mittler, Jeffrey J.L. Carson
Physics and Astronomy Publications
Molecular surface plasmon resonance (SPR) sensing is one of the most common applications of an array of periodic nanoholes in a metal film. However, metallic nanohole arrays (NHAs) with low-hole count have lower resolution and SPR sensing performance compared to NHAs with high-hole count. In this paper, we present a compact three-dimensional (3D) plasmonic nanostructure with extraordinary optical transmission properties benefiting from surface plasmon matching and enhanced localized surface plasmon coupling. The 3D nanostructure consisted of a gold film containing a NHA with an underlying cavity and a gold nanocone array (NCA) at the bottom of the cavity. Each nanocone …
Numerical Simulations Of Compact Intracloud Discharges As The Relativistic Runaway Electron Avalanche-Extensive Air Shower Process,
2014
Florida Institute of Technology
Numerical Simulations Of Compact Intracloud Discharges As The Relativistic Runaway Electron Avalanche-Extensive Air Shower Process, Shahab Arabshahi, Joseph R. Dwyer, A. Nag, V. A. Rakov, Hamid K. Rassoul
Aerospace, Physics, and Space Science Faculty Publications
Compact intracloud discharges (CIDs) are sources of the powerful, often isolated radio pulses emitted by thunderstorms. The VLF-LF radio pulses are called narrow bipolar pulses (NBPs). It is still not clear how CIDs are produced, but two categories of theoretical models that have previously been considered are the Transmission Line (TL) model and the Relativistic Runaway Electron Avalanche-Extensive Air Showers (RREA-EAS) model. In this paper, we perform numerical calculations of RREA-EASs for various electric field configurations inside thunderstorms. The results of these calculations are compared to results from the other models and to the experimental data. Our analysis shows that …
Exomol Molecular Line Lists V: The Ro-Vibrational Spectra Of Nacl And Kcl,
2014
Old Dominion University
Exomol Molecular Line Lists V: The Ro-Vibrational Spectra Of Nacl And Kcl, Emma J. Barton, Christopher Chiu, Shirin Golpayegani, Sergei N. Yurchenko, Jonathan Tennyson, Daniel J. Frohman, Peter F. Bernath
Chemistry & Biochemistry Faculty Publications
Accurate rotation-vibration line lists for two molecules, NaCl and KCl, in their ground electronic states are presented. These line lists are suitable for temperatures relevant to exoplanetary atmospheres and cool stars (up to 3000 K). Isotopologues 23Na35Cl, 23Na37Cl, 39K35Cl, 39K37Cl, 41K35Cl and 41K37Cl are considered. Laboratory data were used to refine ab initio potential energy curves in order to compute accurate ro-vibrational energy levels. Einstein A coefficients are generated using newly determined ab initio dipole moment curves calculated using the CCSD(T) method. …
A Transition Mass For Black Holes To Show Broad Emission Lines,
2014
Harvard University
A Transition Mass For Black Holes To Show Broad Emission Lines, Susmita Chakravorty, Martin Elvis, Gary J. Ferland
Physics and Astronomy Faculty Publications
Although the supermassive (AGN) and stellar mass (BHBs) black holes have many properties in common, the broad emission lines (BELs) are exclusively signatures of the active galactic nuclei (AGN). Based on the detection of these lines from Sloan Digital Sky Survey (SDSS) data bases, there seems to be no AGN with mass MBH ≲ 105 M⊙. In this paper, we investigate if such low-mass black holes are really non-existent or they are undetected because the BELs in them are not produced efficiently. Using the ionizing spectral energy distribution for a wide range of black hole mass, …
Suppression Of Dielectronic Recombination At Finite Densities,
2014
Western Michigan University
Suppression Of Dielectronic Recombination At Finite Densities, T. W. Gorczyca, D. Nikolić, N. R. Badnell, Gary J. Ferland
Physics and Astronomy Faculty Publications
Density-dependent effective dielectronic recombination rate coefficients are determined in order to explore finite-density effects on the ionization balance of plasmas.
Binary Star Light Curve And Model Of Tyc 3670-588-1 From Professional-Amateur Collaboration, A,
2014
Arkansas Tech University
Binary Star Light Curve And Model Of Tyc 3670-588-1 From Professional-Amateur Collaboration, A, J. W. Robertson, B. Mcmath, D. Waters, R. T. Campbell, G. Roberts
Journal of the Arkansas Academy of Science
We present the orbital light curve and model system parameters of a newly discovered eclipsing binary star in the constellation of Perseus. Our professional-amateur astronomy collaboration between Arkansas Tech University (ATU), the Central Arkansas Astronomy Society (CAAS) and Whispering Pine Observatory, produced photometry in two wavelengths (Johnson V and R) in order to model the system for fundamental parameters with a binary modeling code. We determined that this binary system contains two F-type stars orbiting each other with a short orbital period and having the following characteristics for the two components: mass ratio (q ~ 0.92), temperatures (T1~ 7170 K, …
Bayesian Detection And Characterization Of Extra-Solar Planets Via Photometric Variations,
2014
University at Albany, State University of New York
Bayesian Detection And Characterization Of Extra-Solar Planets Via Photometric Variations, Ben H. Placek
Legacy Theses & Dissertations (2009 - 2024)
Exoplanets are known to be responsible for a variety of photometric effects, which collectively can be used for both exoplanet detection and characterization. A portion of the observed flux variation originates directly from the exoplanet itself as both a reflected light component and thermal emission. Additional effects originate from the influence of the exoplanet on its host star. These include Doppler boosting, or beaming, caused by the radial velocity variations due to the stellar wobble, as well as variations in flux caused by the ellipsoidal shape of the star, which is induced by the planetary tidal forces. The newly developed …
Neutral Pion Cross Section And Spin Asymmetries At Intermediate Pseudorapidity In Polarized Proton Collisions At √ S = 200 Gev,
2014
Old Dominion University
Neutral Pion Cross Section And Spin Asymmetries At Intermediate Pseudorapidity In Polarized Proton Collisions At √ S = 200 Gev, L. Adamczyk, J. K. Adkins, G. Agakishiev, M. M. Aggarwal, Z. Ahammed, I. Alekseev, S. Bültmann, I. Koralt, D. Plyku, Star Collaboration
Physics Faculty Publications
The differential cross section and spin asymmetries for neutral pions produced within the intermediate pseudorapidity range 0.8<η/c and is found to agree with a next-to-leading order perturbative QCD calculation. The longitudinal double-spin asymmetry ALL is measured in the same pseudorapidity range and spans a range of Bjorken-x down to x≈0.01. The measured ALL is consistent with model predictions for varying degrees of gluon polarization. The parity-violating asymmetry AL is also measured and found to be consistent with zero. The transverse single-spin asymmetry AN is measured over a previously unexplored kinematic range in Feynman-x and PT. Such measurements may aid our understanding of the onset and kinematic dependence of the large asymmetries observed …
Orion,
2014
Parkland College
Orion, Katelyn G. Gyorkos
Natural Sciences Student Research Presentations
The purpose of this project was to gather information about the stars and objects in the constellation Orion. This is a project for the Natural Sciences Poster Session at Parkland College.
Welcome To Maxwell Montes,
2014
Parkland College
Welcome To Maxwell Montes, Nichole S. Buck
Natural Sciences Student Research Presentations
This poster poses Venus as a travel destination through a fictional travel agency, Venusian Journeys, and provides facts about the planet, the continent Ishtar Terra and its highest point, Maxwell Montes. This is a project for the Natural Sciences Poster Session at Parkland College.
