The Sun as an X-Ray Star. III. Flares
... di†erent phases of the solar cycle plus one Ñare case. The present work applies this analysis to several solar Ñares in the perspective to interpret stellar Ñares and some features of very active stellar coronae. Coronal Ñares are transient, X-ray bright, and localized events : they last from few mi ...
... di†erent phases of the solar cycle plus one Ñare case. The present work applies this analysis to several solar Ñares in the perspective to interpret stellar Ñares and some features of very active stellar coronae. Coronal Ñares are transient, X-ray bright, and localized events : they last from few mi ...
The Age and Progenitor Mass of Sirius B
... Binaries consisting of a nuclear-burning star and a white dwarf offer another potential source of candidates for the IFMR. If the parameters of the nuclear-burning star can be established with sufficient accuracy that its age can be obtained by fitting its position on the HR Diagram, then the total ...
... Binaries consisting of a nuclear-burning star and a white dwarf offer another potential source of candidates for the IFMR. If the parameters of the nuclear-burning star can be established with sufficient accuracy that its age can be obtained by fitting its position on the HR Diagram, then the total ...
solar twins and solar analogues in galactic surveys
... we call a solar twin a star that has the same observed parameters as the Sun within its errors. These stars can be used as stand-in suns when doing observations, as normal night-time telescopes are not built to be pointed at the Sun. There have been many searches for these twins and every one of the ...
... we call a solar twin a star that has the same observed parameters as the Sun within its errors. These stars can be used as stand-in suns when doing observations, as normal night-time telescopes are not built to be pointed at the Sun. There have been many searches for these twins and every one of the ...
Relationship between solar wind dynamic pressure and amplitude
... In the second stage after the passage of the compressional HM wave front tail-ward, the dawn-to-dusk electric field is enhanced by the enhanced magnetospheric convection in the compressed magnetosphere. This electric field produces the FACs and ICs, which flow in the opposite direction of the initia ...
... In the second stage after the passage of the compressional HM wave front tail-ward, the dawn-to-dusk electric field is enhanced by the enhanced magnetospheric convection in the compressed magnetosphere. This electric field produces the FACs and ICs, which flow in the opposite direction of the initia ...
Transit of Venus 5th-6th of June 2012
... Hawaï) and at Svalbard (Norway), where the European Space Aency ESA had organized a scientific conference on the Venus Express mission. The first results were presented at the European conference on planetary science in Madrid (Spain) held during the week of September 23rd to 28th, then at the equiv ...
... Hawaï) and at Svalbard (Norway), where the European Space Aency ESA had organized a scientific conference on the Venus Express mission. The first results were presented at the European conference on planetary science in Madrid (Spain) held during the week of September 23rd to 28th, then at the equiv ...
photoelectric emission measurements on the analogs of individual
... the measured enhancement was affected by the surface contaminants. The existing models have not provided a satisfactory explanation for the observed data. ...
... the measured enhancement was affected by the surface contaminants. The existing models have not provided a satisfactory explanation for the observed data. ...
20. Meteorites and the chemical evolution of the Milky Way
... and metallicity. Moreover, there are still large uncertainties in the predicted yields due to uncertainties in the stellar evolution physics and nuclear reaction cross sections. A key concept related to stellar yields is the definition of primary and secondary species. A primary specie is one that c ...
... and metallicity. Moreover, there are still large uncertainties in the predicted yields due to uncertainties in the stellar evolution physics and nuclear reaction cross sections. A key concept related to stellar yields is the definition of primary and secondary species. A primary specie is one that c ...
Astrobiological Stoichiometry
... abundances for the same element in the same star. Figure 2, from the work of Hinkel (2012), illustrates how different research groups measured the elements Na, Si, O, Sc, Al, and Fe in five different stars (the data sets are discussed and the research groups identified by Hinkel, 2012). The maximum ...
... abundances for the same element in the same star. Figure 2, from the work of Hinkel (2012), illustrates how different research groups measured the elements Na, Si, O, Sc, Al, and Fe in five different stars (the data sets are discussed and the research groups identified by Hinkel, 2012). The maximum ...
photosphere
... The Magnetic Carpet of the Corona • Corona contains very low-density, very hot (1 million oK) gas • Coronal gas is heated through motions of magnetic fields anchored in the photosphere below (“magnetic carpet”) ...
... The Magnetic Carpet of the Corona • Corona contains very low-density, very hot (1 million oK) gas • Coronal gas is heated through motions of magnetic fields anchored in the photosphere below (“magnetic carpet”) ...
SAGE_prop
... atmospheric abundances and understand how important elements such as CNO are returned to enrich the interstellar medium; determine the incidence of circumstellar material associated with the disruption of remnant planetary systems. Probe the structure & ionization of the Local Interstellar Gas: meas ...
... atmospheric abundances and understand how important elements such as CNO are returned to enrich the interstellar medium; determine the incidence of circumstellar material associated with the disruption of remnant planetary systems. Probe the structure & ionization of the Local Interstellar Gas: meas ...
Polaris – Distance to Pole
... and none of them match the others. There are just as many measurements and methods as there are astronomers, and all of them disagree. What is needed is a long term project with the aim of mapping the heavens conducted from a single location over a period of several years. 1563 - age 17 ...
... and none of them match the others. There are just as many measurements and methods as there are astronomers, and all of them disagree. What is needed is a long term project with the aim of mapping the heavens conducted from a single location over a period of several years. 1563 - age 17 ...
S.V. Berdyugina, I.G. Usoskin, Preferred Longitudes in Sunspot
... Note that the synthesized magnitudes differ from the real solar brightness since the latter includes also such bright phenomena as faculae. The above procedure transforms the two-dimensional sunspot distribution into a one-dimensional data set and, therefore, is similar to other filtering techniques. ...
... Note that the synthesized magnitudes differ from the real solar brightness since the latter includes also such bright phenomena as faculae. The above procedure transforms the two-dimensional sunspot distribution into a one-dimensional data set and, therefore, is similar to other filtering techniques. ...
Recent Measurements of Millisecond Pulsar Masses
... systems, like PSR B1913+16 or PSR J0737-3039. This happens because they have eccentric orbits, where more relativistic effects can be measured. Their masses range from 1.25 to 1.44 solar masses. • Because of prolonged accretion, MSPs could be a lot more massive. But are they? • MSP masses are diffic ...
... systems, like PSR B1913+16 or PSR J0737-3039. This happens because they have eccentric orbits, where more relativistic effects can be measured. Their masses range from 1.25 to 1.44 solar masses. • Because of prolonged accretion, MSPs could be a lot more massive. But are they? • MSP masses are diffic ...
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.