Predicting Sky Dome Appearance on Earth
... When adapting the model for direct solar radiance, one has to bear in mind that there is very likely a comparatively tight range of absolute solar irradiance values for which an earth-like planet with an atmosphere like the one we assume in our model can exist in the first place. Too much irradiance ...
... When adapting the model for direct solar radiance, one has to bear in mind that there is very likely a comparatively tight range of absolute solar irradiance values for which an earth-like planet with an atmosphere like the one we assume in our model can exist in the first place. Too much irradiance ...
Acronyme - LPSC
... recorded until end of 2012, two times more statistics will be collected. But increasing the statistics of the measured showers will not be sufficient to answer the key questions outlined above. Therefore the Pierre Auger collaboration aims at an upgrade of the Observatory to ensure that the data col ...
... recorded until end of 2012, two times more statistics will be collected. But increasing the statistics of the measured showers will not be sufficient to answer the key questions outlined above. Therefore the Pierre Auger collaboration aims at an upgrade of the Observatory to ensure that the data col ...
Lecture03
... with respect to the Sun’s position on the sky. • A sidereal day (period of rotation measured with respect to the stars – see Box 2-2) is slightly shorter; it is shorter by approximately 4 minutes. • The number of sidereal days in a year is precisely one more than the number of mean solar days in a y ...
... with respect to the Sun’s position on the sky. • A sidereal day (period of rotation measured with respect to the stars – see Box 2-2) is slightly shorter; it is shorter by approximately 4 minutes. • The number of sidereal days in a year is precisely one more than the number of mean solar days in a y ...
Ocean-like water in the Jupiter
... in six comets from the Oort cloud yielded a mean D/H ratio of (2.96 6 0.25) 3 1024. The D/H value in carbonaceous chondrites, (1.4 6 0.1) 3 1024, together with dynamical simulations, led to models in which asteroids were the main source of Earth’s water7, with #10 per cent being delivered by comets. ...
... in six comets from the Oort cloud yielded a mean D/H ratio of (2.96 6 0.25) 3 1024. The D/H value in carbonaceous chondrites, (1.4 6 0.1) 3 1024, together with dynamical simulations, led to models in which asteroids were the main source of Earth’s water7, with #10 per cent being delivered by comets. ...
The Sun - The University Centre in Svalbard
... THE ENERGY PRODUCTION The conditions in the solar core are extreme and this area is kind of like a nuclear power plant. The temperature is over 15 million degrees C, and the enormous pressure is pushing the atoms very close together causing them to collide with each other all the time. Sometimes hy ...
... THE ENERGY PRODUCTION The conditions in the solar core are extreme and this area is kind of like a nuclear power plant. The temperature is over 15 million degrees C, and the enormous pressure is pushing the atoms very close together causing them to collide with each other all the time. Sometimes hy ...
Document
... Going Back to the Akmal, Pandharipande, Ravenhall nuclear phase in in fig 11 of APR ( PRC,58, 1804 (1998)) we find that for the APR [A18 + dv +UIX] the central density of a star of 1.8 solar mass is ( n_B ~0.62 /fm^3), very close to the initial density at which the phase transition begins. The reaso ...
... Going Back to the Akmal, Pandharipande, Ravenhall nuclear phase in in fig 11 of APR ( PRC,58, 1804 (1998)) we find that for the APR [A18 + dv +UIX] the central density of a star of 1.8 solar mass is ( n_B ~0.62 /fm^3), very close to the initial density at which the phase transition begins. The reaso ...
CHAPTER 29 STARS 240 points
... One of the many ways scientists learn more about stars is the use of spectral lines. Spectral lines help scientists determine the speed of a star’s motion. Motion between the source of light and the observer cause the spectral lines to shift in wavelength. Depending on whether the wavelength is shor ...
... One of the many ways scientists learn more about stars is the use of spectral lines. Spectral lines help scientists determine the speed of a star’s motion. Motion between the source of light and the observer cause the spectral lines to shift in wavelength. Depending on whether the wavelength is shor ...
Chandra Emission Line Diagnostics of Sco
... explain these data. Our sun produces x-rays through a magnetic dynamo created by the interaction of convection and rotation. It was theorized that hot stars did not have this convective envelope. However, some recent observations support the existence of magnetic fields and possibly magnetic activit ...
... explain these data. Our sun produces x-rays through a magnetic dynamo created by the interaction of convection and rotation. It was theorized that hot stars did not have this convective envelope. However, some recent observations support the existence of magnetic fields and possibly magnetic activit ...
SOLAR ECLIPSES
... effect is less than 60 seconds, but sight damage due to repetitive exposures, even shorter, could occur, as the destructive effects on the retina are cumulative. If an optical instrument such as refractor, telescope, and binoculars is used, the time limit of the exposure will be shorter than a fract ...
... effect is less than 60 seconds, but sight damage due to repetitive exposures, even shorter, could occur, as the destructive effects on the retina are cumulative. If an optical instrument such as refractor, telescope, and binoculars is used, the time limit of the exposure will be shorter than a fract ...
The Origin of the Solar System
... Computer simulations show that Jovian planets can grow by direct gas accretion without forming rocky ...
... Computer simulations show that Jovian planets can grow by direct gas accretion without forming rocky ...
Physical structure of the local interstellar medium
... the general ISM. However, due to its proximity, it is the only region in the Universe where we can study the three-dimensional structure of the ISM in detail. The LISM is ideally suited to make detailed studies and test models and assumptions on diverse phenomena, which can then be applied to more d ...
... the general ISM. However, due to its proximity, it is the only region in the Universe where we can study the three-dimensional structure of the ISM in detail. The LISM is ideally suited to make detailed studies and test models and assumptions on diverse phenomena, which can then be applied to more d ...
The Limits of Our Solar System - Lunar and Planetary Institute
... the arrival direction of the interstellar H differs from that of the interstellar He by about 4° (Lallement et al., 2005). This offset results from charge exchange of the H with the deflected H+ in front of the heliosphere. The direction of the offset tells us the direction of the plasma flow in the ...
... the arrival direction of the interstellar H differs from that of the interstellar He by about 4° (Lallement et al., 2005). This offset results from charge exchange of the H with the deflected H+ in front of the heliosphere. The direction of the offset tells us the direction of the plasma flow in the ...
scholer-shocks-ii
... At low Mach number waves (with large k) have upstream directed group velocity; they are phase-standing or have downstream directed phase velocity. ...
... At low Mach number waves (with large k) have upstream directed group velocity; they are phase-standing or have downstream directed phase velocity. ...
Advanced Composition Explorer
Advanced Composition Explorer (ACE) is a NASA Explorers program Solar and space exploration mission to study matter comprising energetic particles from the solar wind, the interplanetary medium, and other sources. Real-time data from ACE is used by the NOAA Space Weather Prediction Center to improve forecasts and warnings of solar storms. The ACE robotic spacecraft was launched August 25, 1997 and entered a Lissajous orbit close to the L1 Lagrangian point (which lies between the Sun and the Earth at a distance of some 1.5 million km from the latter) on December 12, 1997. The spacecraft is currently operating at that orbit. Because ACE is in a non-Keplerian orbit, and has regular station-keeping maneuvers, the orbital parameters at right are only approximate. The spacecraft is still in generally good condition in 2015, and is projected to have enough fuel to maintain its orbit until 2024. NASA Goddard Space Flight Center managed the development and integration of the ACE spacecraft.