ASTR-100 - Jiri Brezina Teaching
... day and night, equinoxes: vernal equinox is the place where the Sun moves northward (about 21 March), it marks the beginning of spring, and the autumnal equinox is the place where it crosses moving southward (about 21 Sep.), it marks the beginning of fall. The sun is farthest north at the point call ...
... day and night, equinoxes: vernal equinox is the place where the Sun moves northward (about 21 March), it marks the beginning of spring, and the autumnal equinox is the place where it crosses moving southward (about 21 Sep.), it marks the beginning of fall. The sun is farthest north at the point call ...
1 solar and stellar abundances of the elements
... ASTRONOMERS,nuclear physicists, and cosmologists have long sought to determine the "cosmic" abundances of the elements, i.e. the chemical composition of stars and gaseous nebulae in our part of the galaxy. In this contribution we shall be especially concerned with the composition of the sun which pr ...
... ASTRONOMERS,nuclear physicists, and cosmologists have long sought to determine the "cosmic" abundances of the elements, i.e. the chemical composition of stars and gaseous nebulae in our part of the galaxy. In this contribution we shall be especially concerned with the composition of the sun which pr ...
The prompt and afterglow emission of GRB991216
... negligible at least in the first phase of the oscillations •The energy and the number of photons increase with time Ruffini, Vitagliano and Xue (2004) Ruffini, Vereshchagin and Xue (2007) ...
... negligible at least in the first phase of the oscillations •The energy and the number of photons increase with time Ruffini, Vitagliano and Xue (2004) Ruffini, Vereshchagin and Xue (2007) ...
heavenly bodies
... Results from the Rosetta and Philae spacecraft show that the nucleus of 67P/Churyumov – Gerasimenko has no magnetic field, which suggests that magnetism may not have played a role in the early formation of planet animals. Further, the ALICE spectrograph on Rosetta determined that electrons (within ...
... Results from the Rosetta and Philae spacecraft show that the nucleus of 67P/Churyumov – Gerasimenko has no magnetic field, which suggests that magnetism may not have played a role in the early formation of planet animals. Further, the ALICE spectrograph on Rosetta determined that electrons (within ...
Variability of solar/stellar activity and magnetic field and its influence... planetary atmosphere evolution
... solar/stellar wind lead to atmospheric modifications which can be observed by satellites. In this article we focus on the evolution of the solar/stellar radiation, plasma and magnetic environment during the Sun’s (stars) life and its response on the upper atmospheres of terrestrial planets. In Secti ...
... solar/stellar wind lead to atmospheric modifications which can be observed by satellites. In this article we focus on the evolution of the solar/stellar radiation, plasma and magnetic environment during the Sun’s (stars) life and its response on the upper atmospheres of terrestrial planets. In Secti ...
STUDY OF UMBRA-PENUMBRA AREA RATIO OF SUNSPOTS
... Sun contains almost 99.9% of the mass of the solar system. It emits energy into space, mostly in the form of electromagnetic radiation. The Sun’s spectrum is close to that of an idealized black body with a temperature of about 5800 K and the maximum lying in the visible region. Solar energy is very ...
... Sun contains almost 99.9% of the mass of the solar system. It emits energy into space, mostly in the form of electromagnetic radiation. The Sun’s spectrum is close to that of an idealized black body with a temperature of about 5800 K and the maximum lying in the visible region. Solar energy is very ...
X-ray effects on protoplanetary disks
... X-ray flares are strong and ubiquitous in pre-main sequence stars throughout the planet formation era • Elevated X-ray flaring seen in thousands of PMS stars in dozens of star forming regions. 28 < log Lx < 32 erg/s. • For 1 MO stars, flares are ~102 more luminous and ~102 more frequent than in con ...
... X-ray flares are strong and ubiquitous in pre-main sequence stars throughout the planet formation era • Elevated X-ray flaring seen in thousands of PMS stars in dozens of star forming regions. 28 < log Lx < 32 erg/s. • For 1 MO stars, flares are ~102 more luminous and ~102 more frequent than in con ...
- Achieve the Core
... matter and the stimuli allow for the testing of the Common Core State Standards (CCSS) for Literacy in Science and Technical Subjects and the Reading Standards for Informational Texts. The text is worthy of students’ time to read, and the video adds a multimedia component to make the task a more com ...
... matter and the stimuli allow for the testing of the Common Core State Standards (CCSS) for Literacy in Science and Technical Subjects and the Reading Standards for Informational Texts. The text is worthy of students’ time to read, and the video adds a multimedia component to make the task a more com ...
Activity Indices Based on Sun-as-a-Star Spectra Obtained with the
... sequence, which is the phase in which they are most stable (Zeilik and Gregory, 1998, p. 262). What the stars on the main sequence also have in common is that they generate their energy from hydrogen burning in the core. Another very interesting finding was that stars spin up before they reach the ...
... sequence, which is the phase in which they are most stable (Zeilik and Gregory, 1998, p. 262). What the stars on the main sequence also have in common is that they generate their energy from hydrogen burning in the core. Another very interesting finding was that stars spin up before they reach the ...
1. INTRODUCTION
... from stellar coronae. In order to identify a sufficient number of Ñares in the EUV E Deep Survey (DS) light curves, data sets with more than 5 days of monitoring or with a signiÐcant number of Ñares (more than ten Ñares identiÐed by eye) were selected. Active coronal sources were our prime choice, a ...
... from stellar coronae. In order to identify a sufficient number of Ñares in the EUV E Deep Survey (DS) light curves, data sets with more than 5 days of monitoring or with a signiÐcant number of Ñares (more than ten Ñares identiÐed by eye) were selected. Active coronal sources were our prime choice, a ...
Stellar Spectroscopy during Exoplanet Transits
... Line profile changes during exoplanet transit. Red: Ratios of line profiles relative to the profile outside transit. This simulation sequence from a CO5BOLD model predicts the behavior of an Fe I line ( 620 nm, = 3 eV) during the first half of a transit across the stellar equator by a bloated Jup ...
... Line profile changes during exoplanet transit. Red: Ratios of line profiles relative to the profile outside transit. This simulation sequence from a CO5BOLD model predicts the behavior of an Fe I line ( 620 nm, = 3 eV) during the first half of a transit across the stellar equator by a bloated Jup ...
Written Transcript of this video lesson
... negative charges; any neutral atom has equal number of negative charged – electrons- and positive charged –protons- . The continuous raising of the atoms’ temperature up to 100000ºC, leads to releasing some or all the free electrons, so they move freely; here we say that the gas is ionized. If suffi ...
... negative charges; any neutral atom has equal number of negative charged – electrons- and positive charged –protons- . The continuous raising of the atoms’ temperature up to 100000ºC, leads to releasing some or all the free electrons, so they move freely; here we say that the gas is ionized. If suffi ...
ASTR-100 - Jiri Brezina Teaching
... day and night, equinoxes: vernal equinox is the place where the Sun moves northward (about 21 March), it marks the beginning of spring, and the autumnal equinox is the place where it crosses moving southward (about 21 Sep.), it marks the beginning of fall. The sun is farthest north at the point call ...
... day and night, equinoxes: vernal equinox is the place where the Sun moves northward (about 21 March), it marks the beginning of spring, and the autumnal equinox is the place where it crosses moving southward (about 21 Sep.), it marks the beginning of fall. The sun is farthest north at the point call ...
3. Neutron Star X-ray Binaries
... and ZX-ray - Sources: ---rapidly called spinning “slow” accretion-powered period 1s or more. LMXBs divided in these two typespulsars, depending on ~their timing ...
... and ZX-ray - Sources: ---rapidly called spinning “slow” accretion-powered period 1s or more. LMXBs divided in these two typespulsars, depending on ~their timing ...
Introduction to Geomagnetism - Center for Science Education
... extremely well organized existed beyond the surface of the magnet, and which was perhaps the origin of the magnetic force itself. A compass works the way it does because Earth has a magnetic field that looks a lot like the one belonging to a simple magnet. The Earth's field is completely invisible, ...
... extremely well organized existed beyond the surface of the magnet, and which was perhaps the origin of the magnetic force itself. A compass works the way it does because Earth has a magnetic field that looks a lot like the one belonging to a simple magnet. The Earth's field is completely invisible, ...
Obserwacje strumienia promieniowania rentgenowskiego
... also observed in D2, this level is still fluctuating on a 5 min time scale study is in progress. – Flares are seen on-top of this basal variability. – Flare „enhancements” are being detected from amplitudes above ~ 0.05 dex. – Both short and LDE types of events are present „without the sunspots” ...
... also observed in D2, this level is still fluctuating on a 5 min time scale study is in progress. – Flares are seen on-top of this basal variability. – Flare „enhancements” are being detected from amplitudes above ~ 0.05 dex. – Both short and LDE types of events are present „without the sunspots” ...
Astronomy Astrophysics Carbon monoxide in the solar atmosphere &
... The temporal evolution of the average temperature is shown for the chromospheric height of 650 km in panel b. Even for high initial temperature, the grey radiative equilibrium is reached after only a few minutes. Also the simulation with the cool initial chromosphere (2000 K) shows a steeper evoluti ...
... The temporal evolution of the average temperature is shown for the chromospheric height of 650 km in panel b. Even for high initial temperature, the grey radiative equilibrium is reached after only a few minutes. Also the simulation with the cool initial chromosphere (2000 K) shows a steeper evoluti ...
Oieroset_ARTEMIS_tail_science
... a) When and where does Kelvin-Helmholtz instabilities develop on the flanks? Two-spacecraft measurements can be used to identify non-linear KH vortices which have been suggested to provide significant solar wind entry into the tail during northward IMF conditions. ...
... a) When and where does Kelvin-Helmholtz instabilities develop on the flanks? Two-spacecraft measurements can be used to identify non-linear KH vortices which have been suggested to provide significant solar wind entry into the tail during northward IMF conditions. ...
Astronomy Astrophysics
... the magnetic field beneath each can be very different. If one changes the plot in Fig. 2 to include flares from only a single GOES classification there is little difference in the appearance other than to simply reduce the number of points plotted as the large scatter remains. To limit the effects o ...
... the magnetic field beneath each can be very different. If one changes the plot in Fig. 2 to include flares from only a single GOES classification there is little difference in the appearance other than to simply reduce the number of points plotted as the large scatter remains. To limit the effects o ...
Shape of a slowly rotating star measured by asteroseismology
... 0.14 ± 0.03 (6, 7). Vega, another rapidly rotating A star, has an apparent deformation that is too small to be measured because it is seen almost pole-on (8). Here, we present with unprecedented precision the first measurement of stellar asphericity by means of asteroseismology (9), for the star KIC ...
... 0.14 ± 0.03 (6, 7). Vega, another rapidly rotating A star, has an apparent deformation that is too small to be measured because it is seen almost pole-on (8). Here, we present with unprecedented precision the first measurement of stellar asphericity by means of asteroseismology (9), for the star KIC ...
01.1PART I_Ch1.fm - The Thunderbolts Project
... Today, most astronomers assure us that the solar system is both stable and predictable. But new vistas in the sciences often expose flaws in notions that once seemed obvious. Only a few decades ago, all well-trained, feet-on-the-ground scientists “knew” that— • Space is empty and cannot conduct elec ...
... Today, most astronomers assure us that the solar system is both stable and predictable. But new vistas in the sciences often expose flaws in notions that once seemed obvious. Only a few decades ago, all well-trained, feet-on-the-ground scientists “knew” that— • Space is empty and cannot conduct elec ...
New results on the age- activity relation from Kepler Alfio Bonanno
... the total magnetic energy released in the atmosphere • Further data needed to extend these scaling relations to other stars, but direct numerical simulations can now be tested along the HR diagram ...
... the total magnetic energy released in the atmosphere • Further data needed to extend these scaling relations to other stars, but direct numerical simulations can now be tested along the HR diagram ...
A Rigid-Field Hydrodynamics approach to modelling the
... We introduce a new Rigid-Field Hydrodynamics approach to modelling the magnetospheres of massive stars in the limit of very strong magnetic fields. Treating the field lines as effectively rigid, we develop hydrodynamical equations describing the one-dimensional flow along each, subject to pressure, ...
... We introduce a new Rigid-Field Hydrodynamics approach to modelling the magnetospheres of massive stars in the limit of very strong magnetic fields. Treating the field lines as effectively rigid, we develop hydrodynamical equations describing the one-dimensional flow along each, subject to pressure, ...
Climate and the Role of the Sun
... and the patterns of magnetic field with which they are associated cover all of the sun. Since the middle of the last century we have known that the sun produces sunspots in a fairly regular cycle of about eleven years, during which time their number, counted on any day, rises from none, or almost no ...
... and the patterns of magnetic field with which they are associated cover all of the sun. Since the middle of the last century we have known that the sun produces sunspots in a fairly regular cycle of about eleven years, during which time their number, counted on any day, rises from none, or almost no ...
"The Sun Is A Plasma Diffuser That Sorts Atoms By Mass"
... and “normal” He and Ne. Manuel and Hwaung [10] assumed that the Sun itself is a mix of these two primordial components and used isotope abundances in the solar wind to estimate the fraction of each primitive component in the Sun. Their comparison [10] of He and Ne isotope abundances in meteorites [2 ...
... and “normal” He and Ne. Manuel and Hwaung [10] assumed that the Sun itself is a mix of these two primordial components and used isotope abundances in the solar wind to estimate the fraction of each primitive component in the Sun. Their comparison [10] of He and Ne isotope abundances in meteorites [2 ...
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.