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313 full-text articles. Page 13 of 13.

Corot-7b: Super-Earth Or Super-Io?, Rory Barnes, Sean N. Raymond, Richard Greenberg, Brian Jackson, Nathan A. Kaib 2010 University of Washington

Corot-7b: Super-Earth Or Super-Io?, Rory Barnes, Sean N. Raymond, Richard Greenberg, Brian Jackson, Nathan A. Kaib

Brian Jackson

CoRoT-7b, a planet about 70% larger than the Earth orbiting a Sun-like star, is the first-discovered rocky exoplanet, and hence has been dubbed a "super-Earth." Some initial studies suggested that since the planet is so close to its host star, it receives enough insolation to partially melt its surface. However, these past studies failed to take into consideration the role that tides may play in this system. Even if the planet's eccentricity has always been zero, we show that tidal decay of the semimajor axis could have been large enough that the planet formed on a wider orbit which ...


Globe Walk, Rob Snyder 2010 University of Massachusetts - Amherst

Globe Walk, Rob Snyder

IPY STEM Polar Connections

A “Globe Walk” can be used as a demonstration or classroom activity to guide students toward a better understanding of the affects that Earth’s axial tilt, rotation on Earth’s axis, and orbital motion have on the angles of incidence of sunlight, the lengths of daytimes, and solar insolation.


2010 Solar And Space Physics Decadal Survey White Paper: Next Steps In Solar Spectral Irradiance Studies, Mark P. Rast, Jerald W. Harder, Roberto Casini, Serena Criscuoli, Ilaria Ermolli, Juan Fontenla, Hanli Liu, Scott W. McIntosh, Carolus J. Schrijver, Han Uitenbroek 2010 University of Colorado, Boulder

2010 Solar And Space Physics Decadal Survey White Paper: Next Steps In Solar Spectral Irradiance Studies, Mark P. Rast, Jerald W. Harder, Roberto Casini, Serena Criscuoli, Ilaria Ermolli, Juan Fontenla, Hanli Liu, Scott W. Mcintosh, Carolus J. Schrijver, Han Uitenbroek

Astrophysical & Planetary Sciences Faculty Contributions

Understanding the physical causes underlying solar spectral irradiance variations and the impact of these variations on terrestrial climate remain critical compelling challenges. On the solar side, the most fundamental unknown is the role of the “quiet-sun7 ,” a question brought into focus by spectral irradiance observations during the recent deep minimum, which show opposing trends in the infrared and ultraviolet portions of the spectrum (Harder et al. 2009). On the terrestrial side, while it is clear that the Sun played only a small role in late twentieth century warming, the signature of solar cycle variations in climate are now quite well ...


Nlte Spectral Synthesis Based On 3d Mhd Convection Simulations - Understanding The Role Of The Magnetic Field In Intensity Variations, Margit Haberreiter, Sven Wedemeyer-Boehm, Mark Rast 2010 University of Colorado, Boulder

Nlte Spectral Synthesis Based On 3d Mhd Convection Simulations - Understanding The Role Of The Magnetic Field In Intensity Variations, Margit Haberreiter, Sven Wedemeyer-Boehm, Mark Rast

Astrophysical & Planetary Sciences Faculty Contributions

While the magnetic field is considered to be the main driver for Solar Spectral Irradiance (SSI) variations, the detailed physical mechanisms that explain this relation are not yet fully understood. In this paper we analyze the effect of small scale magnetic field on the intensity in Ca II 393.4 nm and various continuum wavelengths calculated with the NLTE radiative tranfer code SolMod3D. The code calculates NLTE level populations and line spectra based on 3D MHD simulations carried out with CO5BOLD. This enables us to study in great detail the effect of the varying small scale magnetic field on intensity ...


Is There Such A Thing As Quiet Sun?, Mark Peter Rast 2010 University of Colorado, Boulder

Is There Such A Thing As Quiet Sun?, Mark Peter Rast

Astrophysical & Planetary Sciences Faculty Contributions

The Cycle 23–Cycle 24 minimum was deep and prolonged, similar to minima of the late 19th and early 20th centuries but quite different from those between the overlapping cycles of the early space age. This provides a unique opportunity to study the Sun at very low levels of magnetic activity. Here we examine the quiet Sun, defining it to be those portions of the Sun for which continuum intensity variations are dominated by thermal perturbations as op- posed to opacity fluctuations due to the presence of magnetic fields. We briefly present evidence that: (1) The expected thermal signature of ...


Modeling The Solar Irradiance Background Via Numerical Simulation, B. Viticchié, M. Vantaggiato, F. Berrilli, D. del Moro, V. Penza, E. Pietropaolo, M. Rast 2010 Universitá degli Studi di Roma “Tor Vergata”

Modeling The Solar Irradiance Background Via Numerical Simulation, B. Viticchié, M. Vantaggiato, F. Berrilli, D. Del Moro, V. Penza, E. Pietropaolo, M. Rast

Astrophysical & Planetary Sciences Faculty Contributions

Various small scale photospheric processes are responsible for spatial and temporal variations of solar emer- gent intensity. The contribution to total irradiance fluctua- tions of such small scale features is the solar irradiance back- ground. Here we examine the statistical properties of irradi- ance background computed via a n-body numerical scheme mimicking photospheric space-time correlations and cal- ibrated by means of IBIS/DST spectro-polarimetric data. Such computed properties are compared with experimen- tal results derived from the analysis of a VIRGO/SPM data. A future application of the model here presented could be the interpretation of stellar irradiance power spectra ...


Solar Observations During A Solar Minimum Using A Small Radio Telescope, Gary Forrester 2010 Bridgewater State University

Solar Observations During A Solar Minimum Using A Small Radio Telescope, Gary Forrester

Undergraduate Review

The Sun is currently in a quiescent phase called solar minimum. We used Bridgewater State College’s (B.S.C.’s) Small Radio Telescope (SRT) to observe solar radio emission during this quiet phase and correlated our data to solar X-ray data readily available through the National Oceanic and Atmospheric Administration (NOAA). Previous observations made during a period of high solar activity (solar maximum) using one of M.I.T.’s SRTs showed that some solar radio and X-ray events were correlated, while others were not. We made observations during solar minimum and found one event where there was a ...


A Two-Dimensional, Linear–Elastic Model To Explain Radial Extensional Fractures, Pantheon Fossae, Caloris Basin, Mercury, Brianne McDonough 2010 Bridgewater State University

A Two-Dimensional, Linear–Elastic Model To Explain Radial Extensional Fractures, Pantheon Fossae, Caloris Basin, Mercury, Brianne Mcdonough

Undergraduate Review

In this study, two-dimensional linear elasticity theory is used to model the lithospheric stress field that produces radial extensional fractures observed at Pantheon Fossae in the Caloris Basin of Mercury. These fractures were imaged by the MESSENGER mission flyby of Mercury on January 14, 2008 and show radial fractures extending outward from a 40-kilometer impact crater named Apollodorus. Recent studies have proposed several different mechanisms to explain these fractures, including magmatic processes, central basin uplift, and stresses produced by the formation of the impact crater itself.


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