Probability of Solar Flares Turn Out to Form a Coronal Mass
... of solar flares and CMEs variations from the corona magnetic region is the most active manifestation of solar activity and one of the main solar activities is of scientific interest because it reveals the furthering knowledge of the Sun. Interestingly, among different types of observation, the groun ...
... of solar flares and CMEs variations from the corona magnetic region is the most active manifestation of solar activity and one of the main solar activities is of scientific interest because it reveals the furthering knowledge of the Sun. Interestingly, among different types of observation, the groun ...
Study of Low Voltage Prebreakdown Sites in Multicrystalline Si
... are not continuous lines but instead consist, as in [11], of bright point sets. Moreover, not all electrically active grain boundaries introduce breakdown sites. It should be noted that, in the EBIC images of grain boundary producing the line breakdown sites (Figure 3(a)), some dark points and lines ...
... are not continuous lines but instead consist, as in [11], of bright point sets. Moreover, not all electrically active grain boundaries introduce breakdown sites. It should be noted that, in the EBIC images of grain boundary producing the line breakdown sites (Figure 3(a)), some dark points and lines ...
VELOCITIES MEASURED IN SMALL-SCALE SOLAR MAGNETIC ELEMENTS Øystein Langangen, Mats Carlsson, and
... Subject headingg s: Sun: atmospheric motions — Sun: photosphere — techniques: spectroscopic ...
... Subject headingg s: Sun: atmospheric motions — Sun: photosphere — techniques: spectroscopic ...
Interstellar neutral oxygen in a two-shock
... disc (MD) and the computation domain boundary (CDB) are indicated. ...
... disc (MD) and the computation domain boundary (CDB) are indicated. ...
Coronal activity from dynamos in astrophysical
... 1994; Seehafer 1994) the necessity for this process limits the buildup of large-scale helicity, and hence, large-scale magnetic fields. This would effectively eliminate the a ±V dynamo as a practical process for creating large-scale magnetic fields in systems having a large magnetic Reynolds number ...
... 1994; Seehafer 1994) the necessity for this process limits the buildup of large-scale helicity, and hence, large-scale magnetic fields. This would effectively eliminate the a ±V dynamo as a practical process for creating large-scale magnetic fields in systems having a large magnetic Reynolds number ...
Persistence of the Gleissberg 88-year solar cycle over
... the Gleissberg cycle of mean sunspot numbers. In another work by Sofia et al. [1985] the historical record of the Sun’s diameter obtained from timings of eclipses was subject to harmonic analysis with one period equal to 90 years. The amplitude of that cycle was inferred to be little less than ±0.5 ...
... the Gleissberg cycle of mean sunspot numbers. In another work by Sofia et al. [1985] the historical record of the Sun’s diameter obtained from timings of eclipses was subject to harmonic analysis with one period equal to 90 years. The amplitude of that cycle was inferred to be little less than ±0.5 ...
The Sirius Festival
... Song 4: “Flame of Silence”. Man does not live unto himself alone. Cosmic process is based upon benevolence and mutual assistance. Those who function under Divine Law are ever ready to help those who have achieved less and, accordingly, are helped by those who have achieved more. The history of huma ...
... Song 4: “Flame of Silence”. Man does not live unto himself alone. Cosmic process is based upon benevolence and mutual assistance. Those who function under Divine Law are ever ready to help those who have achieved less and, accordingly, are helped by those who have achieved more. The history of huma ...
Non-thermal hard X-ray emission from stellar coronae
... “Space weather” effects on planetary systems ...
... “Space weather” effects on planetary systems ...
No Slide Title - Harvard-Smithsonian Center for Astrophysics
... Stellar winds from polar regions • The Scheurwater & Kuijpers (1988) wave generation mechanism allows us to compute the Alfvén wave velocity amplitude on the “polar cap” photosphere . . . ...
... Stellar winds from polar regions • The Scheurwater & Kuijpers (1988) wave generation mechanism allows us to compute the Alfvén wave velocity amplitude on the “polar cap” photosphere . . . ...
Penumbral thermal structure below the visible surface
... but so far it was not possible to distinguish them observationally. While in a thin penumbra the magnetopause (defined as the current sheet separating the penumbral magnetic field from the surrounding convection) is located at τ5 ≈ 1, in a thick penumbra it lies at greater depth. Therefore, if the p ...
... but so far it was not possible to distinguish them observationally. While in a thin penumbra the magnetopause (defined as the current sheet separating the penumbral magnetic field from the surrounding convection) is located at τ5 ≈ 1, in a thick penumbra it lies at greater depth. Therefore, if the p ...
Nonlinear force-free field extrapolation in spherical geometry
... the extrapolated boundary field and observed boundary data within the measurement errors. Data gaps are assigned an infinite error. We extend this new scheme to spherical geometry and apply it for the first time to real data. Key words. magnetic fields – Sun: corona – Sun: photosphere – methods: num ...
... the extrapolated boundary field and observed boundary data within the measurement errors. Data gaps are assigned an infinite error. We extend this new scheme to spherical geometry and apply it for the first time to real data. Key words. magnetic fields – Sun: corona – Sun: photosphere – methods: num ...
Solar Convection Zone
... observe in the solar photosphere occur in a convectively stable layer; the mean entropy increases outwards throughout the visible parts of the photosphere, except for the rst few tens of kilometers. It is in this shallow layer, with an vertical extent roughly two orders of magnitude smaller than th ...
... observe in the solar photosphere occur in a convectively stable layer; the mean entropy increases outwards throughout the visible parts of the photosphere, except for the rst few tens of kilometers. It is in this shallow layer, with an vertical extent roughly two orders of magnitude smaller than th ...
Constraining planet structure from stellar chemistry: the cases of
... thus be used as a proxy for the iron mass fraction for three out of four terrestrial planets. This fraction is in turn a key quantity for the characterization of exoplanets: from measurement of mass and radius alone, the interior composition can only be weakly constrained owing to model degeneracies ...
... thus be used as a proxy for the iron mass fraction for three out of four terrestrial planets. This fraction is in turn a key quantity for the characterization of exoplanets: from measurement of mass and radius alone, the interior composition can only be weakly constrained owing to model degeneracies ...
Solar flare mechanism based on magnetic arcade reconnection and island... C. Z. Cheng and G. S. Choe
... key observations of flaring processes including homologous flares. Our model is based on resistive magnetohydrodynamic (MHD) simulations of the evolution of a bipolar arcade due to magnetic reconnection and magnetic island creation by imposing various shear-increasing footpoint motions. In our study ...
... key observations of flaring processes including homologous flares. Our model is based on resistive magnetohydrodynamic (MHD) simulations of the evolution of a bipolar arcade due to magnetic reconnection and magnetic island creation by imposing various shear-increasing footpoint motions. In our study ...
An additional term of the Galactic tide due to dark matter
... the new term is clearly dominant here. The total amplitude of the tide is larger in 2 kpc than in 8 kpc, just because of the new term. Although the intrinsic nature of the dark matter is unknown, its gravitational effect has been well mapped observationally, and it is certain that this effect does exi ...
... the new term is clearly dominant here. The total amplitude of the tide is larger in 2 kpc than in 8 kpc, just because of the new term. Although the intrinsic nature of the dark matter is unknown, its gravitational effect has been well mapped observationally, and it is certain that this effect does exi ...
cosmic-ray neon, wolf-rayet stars, and the superbubble origin of
... (1985) showed that the observed energy spectra and anisotropy of cosmic rays were consistent with such a model. Higdon & Lingenfelter (2003) have recently argued that GCRs originate in superbubbles based on the 22 Ne/ 20 Ne excess in GCRs. This expands on their initial work, in which they point out ...
... (1985) showed that the observed energy spectra and anisotropy of cosmic rays were consistent with such a model. Higdon & Lingenfelter (2003) have recently argued that GCRs originate in superbubbles based on the 22 Ne/ 20 Ne excess in GCRs. This expands on their initial work, in which they point out ...
Comets review.fm - Journals at the University of Arizona
... of related topics, for a total of 37 papers. Most of the papers contain numerous black-and-white illustrations that are very useful in following the general arguments. There is also a section with color diagrams and pictures at the end of the book. In the first part of the book, the reader can disco ...
... of related topics, for a total of 37 papers. Most of the papers contain numerous black-and-white illustrations that are very useful in following the general arguments. There is also a section with color diagrams and pictures at the end of the book. In the first part of the book, the reader can disco ...
Solar energetic particle access to distant longitudes through
... as diffusion, using a Fokker-Planck (FP) equation. However, FP models cannot explain the observed fast access of SEPs across the average magnetic field to regions that are widely separated in longitude within the heliosphere without using unrealistically strong cross-field diffusion. Aims. We study ...
... as diffusion, using a Fokker-Planck (FP) equation. However, FP models cannot explain the observed fast access of SEPs across the average magnetic field to regions that are widely separated in longitude within the heliosphere without using unrealistically strong cross-field diffusion. Aims. We study ...
laboratory analysis of presolar silicate stardust from a
... presolar silicate grain found in the fine-grained fraction of the Antarctic CR2 chondrite Graves Nunataks 95229. The grain is characterized by an extremely high 17 O/16 O ratio (6.3 ± 0.2 × 10−3 ) relative to solar values, whereas its 18 O/16 O ratio is solar within measurement uncertainty. It also ...
... presolar silicate grain found in the fine-grained fraction of the Antarctic CR2 chondrite Graves Nunataks 95229. The grain is characterized by an extremely high 17 O/16 O ratio (6.3 ± 0.2 × 10−3 ) relative to solar values, whereas its 18 O/16 O ratio is solar within measurement uncertainty. It also ...
Exospheres and Atmospheric Escape
... determine the structure of the corona and lead to molecular escape are considered in this paper. A planet’s atmosphere decreases in density with increasing altitude, thus an altitude is eventually reached above which molecules can travel planetary scale distances with a very small probability of mak ...
... determine the structure of the corona and lead to molecular escape are considered in this paper. A planet’s atmosphere decreases in density with increasing altitude, thus an altitude is eventually reached above which molecules can travel planetary scale distances with a very small probability of mak ...
The solar silicon abundance based on 3D non
... departures from LTE in Si i lines in the solar photosphere. Non-LTE calculations based on 1D model atmospheres by Wedemeyer (2001) found non-LTE abundance corrections (lg NLTE − lg LTE ) that are typically very slightly negative, and of the order −0.01 dex, a result later consolidated by Shi et al ...
... departures from LTE in Si i lines in the solar photosphere. Non-LTE calculations based on 1D model atmospheres by Wedemeyer (2001) found non-LTE abundance corrections (lg NLTE − lg LTE ) that are typically very slightly negative, and of the order −0.01 dex, a result later consolidated by Shi et al ...
Ray Davis: The Scientist and the Man
... J. Bahcall/Nuclear Physics B (Proc. Suppl.) 48 (1996) 281–283 ...
... J. Bahcall/Nuclear Physics B (Proc. Suppl.) 48 (1996) 281–283 ...
0762 Jun 15
... In order to calculate for a given place on earth the precise circumstances of an eclipse, it is necessary to know the difference between "Terrestrial Time" (TT), formerly "Ephemeris Time" (ET), and "Universal Time" (UT). This difference TT - UT = DeltaT. Especially in the case of solar eclipses a pr ...
... In order to calculate for a given place on earth the precise circumstances of an eclipse, it is necessary to know the difference between "Terrestrial Time" (TT), formerly "Ephemeris Time" (ET), and "Universal Time" (UT). This difference TT - UT = DeltaT. Especially in the case of solar eclipses a pr ...
Understanding of the role of magnetic fields: Galactic perspective
... urgently require starting numerical interstellar research from scratch, e.g., first via creation of a new generation of codes that explicitly forbid reconnection. Whether most of the current interstellar simulations are astrophysically irrelevant depends on whether a fast reconnection process in col ...
... urgently require starting numerical interstellar research from scratch, e.g., first via creation of a new generation of codes that explicitly forbid reconnection. Whether most of the current interstellar simulations are astrophysically irrelevant depends on whether a fast reconnection process in col ...
Solar wind
The solar wind is a stream of charged particles released from the upper atmosphere of the Sun. This plasma consists of mostly electrons, protons and alpha particles with energies usually between 1.5 and 10 keV; embedded in the solar-wind plasma is the interplanetary magnetic field. The solar wind varies in density, temperature and speed over time and over solar longitude. Its particles can escape the Sun's gravity because of their high energy, from the high temperature of the corona and magnetic, electrical and electromagnetic phenomena in it.The solar wind flows outward supersonically to great distances, filling a region known as the heliosphere, an enormous bubble-like volume surrounded by the interstellar medium. Other related phenomena include the aurora (northern and southern lights), the plasma tails of comets that always point away from the Sun, and geomagnetic storms that can change the direction of magnetic field lines and create strong currents in power grids on Earth.