The Comet Cometh
... the comet Mrkos and attained excellent spectra with the spectrograph at its coude focus. Dispersion of his instrument was around 20 Nmm, about four times as good as prism spectrographs previously used. If comets condensed from the solar nebula in the region where Jupiter formed, as many astronomers ...
... the comet Mrkos and attained excellent spectra with the spectrograph at its coude focus. Dispersion of his instrument was around 20 Nmm, about four times as good as prism spectrographs previously used. If comets condensed from the solar nebula in the region where Jupiter formed, as many astronomers ...
DeRosa-LoHCo
... Below are shown surface flows inferred from f-mode timedistance analysis for part of CR1949 (in 1999), as an example of this phenomenon. ...
... Below are shown surface flows inferred from f-mode timedistance analysis for part of CR1949 (in 1999), as an example of this phenomenon. ...
Stockholm University
... take the form of bipolar regions. Above these magnetic concentrations the field continues in an arch-like fashion. These formations appear usually as twisted loop-like structures. These loops can be thought of as a continuation of more concentrated flux ropes in the bulk of the solar convection zone ...
... take the form of bipolar regions. Above these magnetic concentrations the field continues in an arch-like fashion. These formations appear usually as twisted loop-like structures. These loops can be thought of as a continuation of more concentrated flux ropes in the bulk of the solar convection zone ...
Distant future of the Sun and Earth revisited
... zero-age solar radius R was 11% smaller than the present value. (2) There was an increase of effective temperature Teff from, according to our model, 5596 K to 5774 K (±5 K). (3) The present Sun is increasing its average luminosity at a rate of 1% in every 110 million years, or 10% over the next bil ...
... zero-age solar radius R was 11% smaller than the present value. (2) There was an increase of effective temperature Teff from, according to our model, 5596 K to 5774 K (±5 K). (3) The present Sun is increasing its average luminosity at a rate of 1% in every 110 million years, or 10% over the next bil ...
the latest related paper
... In 1583, the year Galileo GALILEI observed that a pendulum could be used for keeping time reliably, Joseph-Juste SCALIGER, the chronologist born in Agen, published in Lutecia "De emendatione temporum" [On the Correction of Chronology], the genial dating system he conceived after his lucky escape to ...
... In 1583, the year Galileo GALILEI observed that a pendulum could be used for keeping time reliably, Joseph-Juste SCALIGER, the chronologist born in Agen, published in Lutecia "De emendatione temporum" [On the Correction of Chronology], the genial dating system he conceived after his lucky escape to ...
Folie 1
... • The protoplanet is embedded in a nebula. In this case the protoplanet is defined as the core and the region gravitationally bound to the core (called the Hill sphere). • At its outer boundary the protoplanet is in thermal and pressure equilibrium with the nebula. • It accretes solid planetesimals ...
... • The protoplanet is embedded in a nebula. In this case the protoplanet is defined as the core and the region gravitationally bound to the core (called the Hill sphere). • At its outer boundary the protoplanet is in thermal and pressure equilibrium with the nebula. • It accretes solid planetesimals ...
Non-thermal hard X-ray emission from stellar coronae
... Ilgner & Nelson (2006) What the role of hard X-rays during flares, ...
... Ilgner & Nelson (2006) What the role of hard X-rays during flares, ...
Distant future of the Sun and Earth revisited
... zero-age solar radius R was 11% smaller than the present value. (2) There was an increase of effective temperature Teff from, according to our model, 5596 K to 5774 K (±5 K). (3) The present Sun is increasing its average luminosity at a rate of 1% in every 110 million years, or 10% over the next bil ...
... zero-age solar radius R was 11% smaller than the present value. (2) There was an increase of effective temperature Teff from, according to our model, 5596 K to 5774 K (±5 K). (3) The present Sun is increasing its average luminosity at a rate of 1% in every 110 million years, or 10% over the next bil ...
line ratio electron temperature diagnostic in helicon plasma
... model doesn’t assume that bound excited populations originate exclusively from the ground state via electron impact excitation. Secondary processes like excitation transfer, recombination and, ionization involving all excited states are included in the computation. In order to use this model, the pl ...
... model doesn’t assume that bound excited populations originate exclusively from the ground state via electron impact excitation. Secondary processes like excitation transfer, recombination and, ionization involving all excited states are included in the computation. In order to use this model, the pl ...
Neon and oxygen in low activity stars: towards a coronal unification
... however, the specific linear combination can be differently chosen. In Fig. 2 we show the emissivity curves, i.e. G(T ), of the respective linear combinations for Ne and O as used by Drake & Testa (2005) (D&T) and Liefke & Schmitt (2006) (L&S) and calculated with the CHIANTI V 5.2 code (Dere et al. 1 ...
... however, the specific linear combination can be differently chosen. In Fig. 2 we show the emissivity curves, i.e. G(T ), of the respective linear combinations for Ne and O as used by Drake & Testa (2005) (D&T) and Liefke & Schmitt (2006) (L&S) and calculated with the CHIANTI V 5.2 code (Dere et al. 1 ...
HR 6060: The Closest Ever Solar Twin
... de Strobel (1996), in her large review of the solar analogue subject, gives as kinematical parameters: (U',V',W')sun = (+9,+12,+7), (U',V',W')HR 6060 = (+38,-4,-18). HR 6060 is therefore a typical middle aged, thin disk star, never venturing much either outside the solar circle or the galactic plane ...
... de Strobel (1996), in her large review of the solar analogue subject, gives as kinematical parameters: (U',V',W')sun = (+9,+12,+7), (U',V',W')HR 6060 = (+38,-4,-18). HR 6060 is therefore a typical middle aged, thin disk star, never venturing much either outside the solar circle or the galactic plane ...
The Sun Section 1 The Sun`s Energy, continued
... • Dark lines form in the spectra of stars when gases in the stars’ outer layers absorb specific wavelengths of the light that passes through the layers. ...
... • Dark lines form in the spectra of stars when gases in the stars’ outer layers absorb specific wavelengths of the light that passes through the layers. ...
September 2007 - East Valley Astronomy Club
... as the region surrounding a planet within which its own magnetic field dominates the behavior of electrically charged particles. The solar wind is constantly emanating from the sun. It consists mostly of ionized particles, electrons and protons moving at high velocity, (about 400km/sec.). When the p ...
... as the region surrounding a planet within which its own magnetic field dominates the behavior of electrically charged particles. The solar wind is constantly emanating from the sun. It consists mostly of ionized particles, electrons and protons moving at high velocity, (about 400km/sec.). When the p ...
ES Chapter 30
... – Coronal holes, often located over sunspot groups, are areas of low density in the gas of the corona. – Solar flares are violent eruptions of particles and radiation from the surface of the Sun that are associated with sunspots. – When these particles reach Earth, they can interfere with communicat ...
... – Coronal holes, often located over sunspot groups, are areas of low density in the gas of the corona. – Solar flares are violent eruptions of particles and radiation from the surface of the Sun that are associated with sunspots. – When these particles reach Earth, they can interfere with communicat ...
New energy and helicity bounds for knotted and braided magnetic
... writhe and twist contributions, HWr and HTw. In particular, we have HTw ¼ H HWr. Hence, an estimate of HTw can be obtained by direct measurements of total helicity, using (5) and (13) by diagram extraction from visiometric analysis based on observational data and imaging analysis. These methods ha ...
... writhe and twist contributions, HWr and HTw. In particular, we have HTw ¼ H HWr. Hence, an estimate of HTw can be obtained by direct measurements of total helicity, using (5) and (13) by diagram extraction from visiometric analysis based on observational data and imaging analysis. These methods ha ...
Literature Review on the Formation of Active Regions
... magnetic field with the electron angular moment (Mestel, 1999). This discovery was used by Hale (1908) to measure the magnitude of the solar magnetic field. Since then, the magnetic nature of sunspots unfolded. The Zeeman effect states that, if an ionized gas is placed in the magnetic field, most of ...
... magnetic field with the electron angular moment (Mestel, 1999). This discovery was used by Hale (1908) to measure the magnitude of the solar magnetic field. Since then, the magnetic nature of sunspots unfolded. The Zeeman effect states that, if an ionized gas is placed in the magnetic field, most of ...
Electromagnetic waves have unique traits.
... Because they do not need a medium, EM waves can pass through outer space, which is a near vacuum. Also, because they do not give up energy in traveling, EM waves can cross the great distances that separate stars and galaxies. For example, rays from the Sun travel about 150 million kilometers (93 mil ...
... Because they do not need a medium, EM waves can pass through outer space, which is a near vacuum. Also, because they do not give up energy in traveling, EM waves can cross the great distances that separate stars and galaxies. For example, rays from the Sun travel about 150 million kilometers (93 mil ...
arXiv:astro-ph/0009259 v3 12 Dec 2000
... then argued that the primary source of the energy available to the sun was the gravitational energy of the primordial meteors from which it was formed. Thus, with great authority and eloquence Lord Kelvin declared in 1862: That some form of the meteoric theory is certainly the true and complete expl ...
... then argued that the primary source of the energy available to the sun was the gravitational energy of the primordial meteors from which it was formed. Thus, with great authority and eloquence Lord Kelvin declared in 1862: That some form of the meteoric theory is certainly the true and complete expl ...
Solar Irradiance Reference Spectra (SIRS) for the 2008 Whole
... 2008). (top) The SOHO MDI magnetic field synoptic image. Note that time is backwards (goes right to left) for synoptic images. (middle) and (bottom) The irradiance time series in broad bands. radiation then show enhanced (brighter) irradiance from 30 March (DOY 090) through 4 April (DOY 095), and th ...
... 2008). (top) The SOHO MDI magnetic field synoptic image. Note that time is backwards (goes right to left) for synoptic images. (middle) and (bottom) The irradiance time series in broad bands. radiation then show enhanced (brighter) irradiance from 30 March (DOY 090) through 4 April (DOY 095), and th ...
How the Sun Shines
... then argued that the primary source of the energy available to the sun was the gravitational energy of the primordial meteors from which it was formed. Thus, with great authority and eloquence Lord Kelvin declared in 1862: That some form of the meteoric theory is certainly the true and complete expl ...
... then argued that the primary source of the energy available to the sun was the gravitational energy of the primordial meteors from which it was formed. Thus, with great authority and eloquence Lord Kelvin declared in 1862: That some form of the meteoric theory is certainly the true and complete expl ...
How the Sun Shines
... then argued that the primary source of the energy available to the sun was the gravitational energy of the primordial meteors from which it was formed. Thus, with great authority and eloquence Lord Kelvin declared in 1862: That some form of the meteoric theory is certainly the true and complete expl ...
... then argued that the primary source of the energy available to the sun was the gravitational energy of the primordial meteors from which it was formed. Thus, with great authority and eloquence Lord Kelvin declared in 1862: That some form of the meteoric theory is certainly the true and complete expl ...
How the Sun Shines
... then argued that the primary source of the energy available to the sun was the gravitational energy of the primordial meteors from which it was formed. Thus, with great authority and eloquence Lord Kelvin declared in 1862: That some form of the meteoric theory is certainly the true and complete expl ...
... then argued that the primary source of the energy available to the sun was the gravitational energy of the primordial meteors from which it was formed. Thus, with great authority and eloquence Lord Kelvin declared in 1862: That some form of the meteoric theory is certainly the true and complete expl ...
How the Sun Shines - School of Natural Sciences
... then argued that the primary source of the energy available to the sun was the gravitational energy of the primordial meteors from which it was formed. Thus, with great authority and eloquence Lord Kelvin declared in 1862: That some form of the meteoric theory is certainly the true and complete expl ...
... then argued that the primary source of the energy available to the sun was the gravitational energy of the primordial meteors from which it was formed. Thus, with great authority and eloquence Lord Kelvin declared in 1862: That some form of the meteoric theory is certainly the true and complete expl ...
БЕЗОТРАЖАТЕЛЬНОЕ ПРОХОЖДЕНИЕ ВОЛНЫ ЧЕР
... the wave vector p() and the wave field amplitude W() may be obtained but the plasma dielectric permeability ef() may has small enough changes on the EW trajectory. The opposite case of large variability of ef() for small enough modulations in p() and W() may take place also. Secondly, calcul ...
... the wave vector p() and the wave field amplitude W() may be obtained but the plasma dielectric permeability ef() may has small enough changes on the EW trajectory. The opposite case of large variability of ef() for small enough modulations in p() and W() may take place also. Secondly, calcul ...
Sun Misconceptions - Florida Solar Energy Center
... This book includes not only basic scientific observations, but also briefly told myths and legends and instructions for easy, homespun demonstrations all illustrated with a combination of color photos and lively cartoons. After a look at the past and future of The Sun, she discusses its visible and ...
... This book includes not only basic scientific observations, but also briefly told myths and legends and instructions for easy, homespun demonstrations all illustrated with a combination of color photos and lively cartoons. After a look at the past and future of The Sun, she discusses its visible and ...
Corona
A corona (Latin, 'crown') is an aura of plasma that surrounds the sun and other celestial bodies. The Sun's corona extends millions of kilometres into space and is most easily seen during a total solar eclipse, but it is also observable with a coronagraph. The word ""corona"" is a Latin word meaning ""crown"", from the Ancient Greek κορώνη (korōnē, “garland, wreath”).The high temperature of the Sun's corona gives it unusual spectral features, which led some in the 19th century to suggest that it contained a previously unknown element, ""coronium"". Instead, these spectral features have since been explained by highly ionized iron (Fe-XIV). Bengt Edlén, following the work of Grotrian (1939), first identified the coronal lines in 1940 (observed since 1869) as transitions from low-lying metastable levels of the ground configuration of highly ionised metals (the green Fe-XIV line at 5303 Å, but also the red line Fe-X at 6374 Å). These high stages of ionisation indicate a plasma temperature in excess of 1,000,000 kelvin, much hotter than the surface of the sun.Light from the corona comes from three primary sources, which are called by different names although all of them share the same volume of space. The K-corona (K for kontinuierlich, ""continuous"" in German) is created by sunlight scattering off free electrons; Doppler broadening of the reflected photospheric absorption lines completely obscures them, giving the spectral appearance of a continuum with no absorption lines. The F-corona (F for Fraunhofer) is created by sunlight bouncing off dust particles, and is observable because its light contains the Fraunhofer absorption lines that are seen in raw sunlight; the F-corona extends to very high elongation angles from the Sun, where it is called the zodiacal light. The E-corona (E for emission) is due to spectral emission lines produced by ions that are present in the coronal plasma; it may be observed in broad or forbidden or hot spectral emission lines and is the main source of information about the corona's composition.