Atmospheric Abundances of Light Elements in the F
... log 7rad = 8.04; the Stark broadening, log C4 = —14.46; and the van der Waals broadening, log CQ = —30.87, following Baschek et al. (1977). The spectral data in this region suffered from interference features produced in the thin surface layer of the CCD chip. Even if we take the uncertainty due to ...
... log 7rad = 8.04; the Stark broadening, log C4 = —14.46; and the van der Waals broadening, log CQ = —30.87, following Baschek et al. (1977). The spectral data in this region suffered from interference features produced in the thin surface layer of the CCD chip. Even if we take the uncertainty due to ...
REPORTS Terahertz Magnetic Response from Artificial Materials
... with THz frequencies, optical components such as lenses and mirrors are commonly used, making a free-space characterization more convenient to pursue (Fig. 1). We performed the measurements here using spectroscopic ellipsometry at oblique incidence. A Fourier transform infrared spectrometer adapted ...
... with THz frequencies, optical components such as lenses and mirrors are commonly used, making a free-space characterization more convenient to pursue (Fig. 1). We performed the measurements here using spectroscopic ellipsometry at oblique incidence. A Fourier transform infrared spectrometer adapted ...
404.06 Stephen Drake
... You can use `all-sky monitor’ X-ray observations, e.g., Swift BAT, MAXI, etc., => given present sensitivity levels ~10-9 erg cm-2 s-1, only the largest flares will be found: e.g., Swift detections of stellar flares from the active binary systems Algol, II Peg & HR 1099 and the M4.5V star EV Lac an ...
... You can use `all-sky monitor’ X-ray observations, e.g., Swift BAT, MAXI, etc., => given present sensitivity levels ~10-9 erg cm-2 s-1, only the largest flares will be found: e.g., Swift detections of stellar flares from the active binary systems Algol, II Peg & HR 1099 and the M4.5V star EV Lac an ...
Intermittent Chaos in Nonlinear Wave-Wave - mtc-m16:80
... ted through the electromagnetic parametric instabilities driven by intense Langmuir waves in acA number of theoretical models of nonlinear tive experiments in space (Chian, 1991). Standwave-wave interactions have been developed in past ing Alfvén waves can generate convective or purely years by our ...
... ted through the electromagnetic parametric instabilities driven by intense Langmuir waves in acA number of theoretical models of nonlinear tive experiments in space (Chian, 1991). Standwave-wave interactions have been developed in past ing Alfvén waves can generate convective or purely years by our ...
PDF: 1227K
... Motivated by the analytic results of the previous section we normalize the growth rate of the instability alternatively by a quantity λ∗0 ≡ β urms /Hρ . In the following we take urms /cs = 0.1. Furthermore, we use νt = ηt = 10−3 cs /kf , so that kf Hρ ≈ 33 and ηt k1 /urms = 10−2 . This also means t ...
... Motivated by the analytic results of the previous section we normalize the growth rate of the instability alternatively by a quantity λ∗0 ≡ β urms /Hρ . In the following we take urms /cs = 0.1. Furthermore, we use νt = ηt = 10−3 cs /kf , so that kf Hρ ≈ 33 and ηt k1 /urms = 10−2 . This also means t ...
study of planetary magnetic fields
... Its field is generated by liquid metallic hydrogen, circulating a rocky core. Its core is heated by gravity pulling helium toward the core, and its rapid rotation. Uranus: The magnetic field of Uranus is a little more complicated than the other planets. Uranus’ magnetic field tilts dramatically and ...
... Its field is generated by liquid metallic hydrogen, circulating a rocky core. Its core is heated by gravity pulling helium toward the core, and its rapid rotation. Uranus: The magnetic field of Uranus is a little more complicated than the other planets. Uranus’ magnetic field tilts dramatically and ...
Module3: Life of a Star
... compressed gas are very hot. The shell (or bubble) shines at different wavelengths, mainly in the X-ray, optical and radio. Supernova remnants are studied at many different wavelengths from optical light to X-rays. Different things are happening in different wavelengths; when we observe in, say the ...
... compressed gas are very hot. The shell (or bubble) shines at different wavelengths, mainly in the X-ray, optical and radio. Supernova remnants are studied at many different wavelengths from optical light to X-rays. Different things are happening in different wavelengths; when we observe in, say the ...
Energy conservation and Poynting`s theorem
... The Faraday disk is known as an intrinsically high-current low-voltage device,12 and Eq. (5) can help us understand why. An application of Ohm’s law gives I=e ¼ R1 ¼ 2prh=lnðb=aÞ. Consider a disk made of a typical conductor, say aluminum, for which r ¼ 3.8 107 S/m.13 If I were 1 A, then even if b ...
... The Faraday disk is known as an intrinsically high-current low-voltage device,12 and Eq. (5) can help us understand why. An application of Ohm’s law gives I=e ¼ R1 ¼ 2prh=lnðb=aÞ. Consider a disk made of a typical conductor, say aluminum, for which r ¼ 3.8 107 S/m.13 If I were 1 A, then even if b ...
A straightforward estimation of the maximum sunspot number for
... predicted a sunspot maximum number for cycle 23 of 170 25. More recently Schatten et al. (1996) predicted a lower value of 138 30. Ohl (1966) found that geomagnetic activity during the last years of the solar cycle could be useful for predicting the next cycle. Later Simon and Legrand (1986) det ...
... predicted a sunspot maximum number for cycle 23 of 170 25. More recently Schatten et al. (1996) predicted a lower value of 138 30. Ohl (1966) found that geomagnetic activity during the last years of the solar cycle could be useful for predicting the next cycle. Later Simon and Legrand (1986) det ...
Nature template - PC Word 97
... field in the extended atmosphere of two AGB stars by simultaneous monitoring of all Stokes parameters of the v=1, J=2-1 maser transition of SiO with IRAM's 30m telescope. Theory of the SiO phenomenon invokes molecular excitation in dense pockets of gas and amplification of radiation in narrow tubes. ...
... field in the extended atmosphere of two AGB stars by simultaneous monitoring of all Stokes parameters of the v=1, J=2-1 maser transition of SiO with IRAM's 30m telescope. Theory of the SiO phenomenon invokes molecular excitation in dense pockets of gas and amplification of radiation in narrow tubes. ...
ASPERA-3: Analyser of Space Plasmas and
... partially thermalised by the bow shock (Kallio et al., 1997). Others undergo chargeexchange reactions with ambient exospheric and thermospheric neutrals, particularly hydrogen, and then impact the exobase as ENAs (Kallio et al., 1997). In both cases, solar wind energy is ‘directly’ deposited into th ...
... partially thermalised by the bow shock (Kallio et al., 1997). Others undergo chargeexchange reactions with ambient exospheric and thermospheric neutrals, particularly hydrogen, and then impact the exobase as ENAs (Kallio et al., 1997). In both cases, solar wind energy is ‘directly’ deposited into th ...
Chapter 15--Our Sun - Geological Sciences
... at a particular altitude differ from one region to another. Some regions of the chromosphere and corona are particularly hot and bright, while other regions are cooler and less dense. In the photosphere, sunspots are cooler than the surrounding surface, though they are still quite hot and bright by ...
... at a particular altitude differ from one region to another. Some regions of the chromosphere and corona are particularly hot and bright, while other regions are cooler and less dense. In the photosphere, sunspots are cooler than the surrounding surface, though they are still quite hot and bright by ...
Planetary Magnetic Fields
... kinked, and even protrude from the surface at points. sunspots are the visual result of these tangled field lines protruding through the surface. sunspots almost always occur in pairs, with different magnetic polarity – one where a field line protrudes from the surface, and another where the same li ...
... kinked, and even protrude from the surface at points. sunspots are the visual result of these tangled field lines protruding through the surface. sunspots almost always occur in pairs, with different magnetic polarity – one where a field line protrudes from the surface, and another where the same li ...
The Sun is a Plasma Diffuser that Sorts Atoms by Mass*
... The bottom of Fig. 1 shows four images taken over a 5-d period on June 1–5, 2005, of a rigid, iron-rich structure below the Sun’s fluid photosphere. These “running difference” images from SOHO used a 195Å filter to enhance light emissions from Fe (IX) and Fe (X). Videos of these images show the rotati ...
... The bottom of Fig. 1 shows four images taken over a 5-d period on June 1–5, 2005, of a rigid, iron-rich structure below the Sun’s fluid photosphere. These “running difference” images from SOHO used a 195Å filter to enhance light emissions from Fe (IX) and Fe (X). Videos of these images show the rotati ...
our brightest star - El Camino College
... and TV antennae to malfunction, and even cause garage door openers to open and close, though this last one is rare. Our observations will almost definitely be limited to material that does not leave the Sun. Prominences may resemble your mental picture of a flare, but the two are very different phen ...
... and TV antennae to malfunction, and even cause garage door openers to open and close, though this last one is rare. Our observations will almost definitely be limited to material that does not leave the Sun. Prominences may resemble your mental picture of a flare, but the two are very different phen ...
Thermal emission and internal heating processes in millisecond
... • Observed UV emission of PSR J0437-4715 may be due to rotochemical heating • The same emission can be used to constrain |dG/dt|: – competitive with best existing constraints if fast cooling processes could be ruled out ...
... • Observed UV emission of PSR J0437-4715 may be due to rotochemical heating • The same emission can be used to constrain |dG/dt|: – competitive with best existing constraints if fast cooling processes could be ruled out ...
Sun - El Camino College
... and TV antennae to malfunction, and even cause garage door openers to open and close, though this last one is rare. Our observations will almost definitely be limited to material that does not leave the Sun. Prominences may resemble your mental picture of a flare, but the two are very different phen ...
... and TV antennae to malfunction, and even cause garage door openers to open and close, though this last one is rare. Our observations will almost definitely be limited to material that does not leave the Sun. Prominences may resemble your mental picture of a flare, but the two are very different phen ...
Hoffmann_Photon_Science_Novosibirsk_1__2015
... proportional to (BL)^2 •Therefore a strong magnet ic field needs to be pointed to the sun ...
... proportional to (BL)^2 •Therefore a strong magnet ic field needs to be pointed to the sun ...
Pulsars
... The particles moves along the field lines and at the same time rotate with them. Charges in the magnetic equatorial region redistribute themselves by moving along closed field lines until they build up an electrostatic field large enough to cancel the magnetic force and give F=0 . The voltage induce ...
... The particles moves along the field lines and at the same time rotate with them. Charges in the magnetic equatorial region redistribute themselves by moving along closed field lines until they build up an electrostatic field large enough to cancel the magnetic force and give F=0 . The voltage induce ...
Slide 1
... photosphere - what you see when you look at the sun about 400 km thick, cool ~ 4400K – 5800K, mostly H remarkably opaque at infrared and shorter wavelengths most H in ground state and thus does not contribute much to absorption need 13.6 eV (121.6 nm) to get H in first excited state 1939- about one ...
... photosphere - what you see when you look at the sun about 400 km thick, cool ~ 4400K – 5800K, mostly H remarkably opaque at infrared and shorter wavelengths most H in ground state and thus does not contribute much to absorption need 13.6 eV (121.6 nm) to get H in first excited state 1939- about one ...
Solar Radius Variations Measured in Central Eclipses
... Ag=0.087·t³ and Ac=8.91·t³/², so that those areas become equal after t∼22 s. Solar corona, in good atmospheric conditions, was visible after and before totality for 15 s on shadow’s limits and for 10 s on centerline. This fact can explain the observations reported by Clavius on his Commentarius in S ...
... Ag=0.087·t³ and Ac=8.91·t³/², so that those areas become equal after t∼22 s. Solar corona, in good atmospheric conditions, was visible after and before totality for 15 s on shadow’s limits and for 10 s on centerline. This fact can explain the observations reported by Clavius on his Commentarius in S ...
The integral magnetic field of 53 Cam - an effect of ring
... properties around the magnetic poles in form of rings - from outside by accretion and from inside by diffusion. This is, of course, known long ago, but it will be confirmed here. The analysis of the element distribution was tackled by ”Magnetic Doppler Imaging” (Piskunov 2001), using the Doppler-shi ...
... properties around the magnetic poles in form of rings - from outside by accretion and from inside by diffusion. This is, of course, known long ago, but it will be confirmed here. The analysis of the element distribution was tackled by ”Magnetic Doppler Imaging” (Piskunov 2001), using the Doppler-shi ...
Stellar Evolution and the fate of the Solar System
... YUV420 codec decompressor are needed to see this picture. ...
... YUV420 codec decompressor are needed to see this picture. ...
ASTR 330: The Solar System
... the solar system is much older than this. Furthermore, many meteorites share this common age, which we have called “the age of the solar system”. • Around 100 years ago, a very different theory for the formation of the planets was in favor. • In this theory, the Sun had existed for much longer than ...
... the solar system is much older than this. Furthermore, many meteorites share this common age, which we have called “the age of the solar system”. • Around 100 years ago, a very different theory for the formation of the planets was in favor. • In this theory, the Sun had existed for much longer than ...
SORCE brochure.qx - Laboratory for Atmospheric and Space Physics
... The 23.5° angle between Earth’s spin axis and its orbit about the Sun gives rise to the seasonal cycle, causing the length of the day and the sunlight angle to vary during the year. As a result, summer is much warmer than winter, and polar regions are dramatically colder than the tropics. Also, Eart ...
... The 23.5° angle between Earth’s spin axis and its orbit about the Sun gives rise to the seasonal cycle, causing the length of the day and the sunlight angle to vary during the year. As a result, summer is much warmer than winter, and polar regions are dramatically colder than the tropics. Also, Eart ...
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.