90377 Sedna
... times Neptune’s distance), making it one of the most distant known objects in the Solar System other than longperiod comets.[lower-alpha 2][lower-alpha 3] Sedna has an exceptionally long and elongated orbit, taking approximately 11,400 years to complete and a distant point of closest approach to the ...
... times Neptune’s distance), making it one of the most distant known objects in the Solar System other than longperiod comets.[lower-alpha 2][lower-alpha 3] Sedna has an exceptionally long and elongated orbit, taking approximately 11,400 years to complete and a distant point of closest approach to the ...
Numerical simulations of wind–equatorial gas
... The WBE has been ejected by the system more than a century ago. However, some dense equatorial outflow might have been continued for tens of years. It is impossible to know the exact mass-loss history and mass-loss rate that led to the formation of the WBE. Considering that our goals are (a) to show ...
... The WBE has been ejected by the system more than a century ago. However, some dense equatorial outflow might have been continued for tens of years. It is impossible to know the exact mass-loss history and mass-loss rate that led to the formation of the WBE. Considering that our goals are (a) to show ...
Ąh = §.Φ© , - Solar Physics Group
... Heyvaerts and Priest (1984) proposed a coronal heating model which invoked magnetic reconnection in a fundamentally different role. They proposed that the coronal magnetic field was slowly stressed by photospheric motions, up to instants where it abruptly relaxed, releasing its stored energy. The re ...
... Heyvaerts and Priest (1984) proposed a coronal heating model which invoked magnetic reconnection in a fundamentally different role. They proposed that the coronal magnetic field was slowly stressed by photospheric motions, up to instants where it abruptly relaxed, releasing its stored energy. The re ...
Solar Flares: Magnetohydrodynamic Processes | SpringerLink
... individual events; in the smallest event the height of a flaring loop is less than 104 km, whereas it reaches 105 km in the largest event (see Section 2). The size also affects the duration of a flare (103 – 104 s) and the amount of energy released during a flare mentioned above. Flares are observed ...
... individual events; in the smallest event the height of a flaring loop is less than 104 km, whereas it reaches 105 km in the largest event (see Section 2). The size also affects the duration of a flare (103 – 104 s) and the amount of energy released during a flare mentioned above. Flares are observed ...
Neptune and Triton_ Essential pieces of the Solar System puzzle
... planetesimals are coloured, depending on whether they have had close encounters with Neptune (grey) or not (red). From Morbidelli (2004). ...
... planetesimals are coloured, depending on whether they have had close encounters with Neptune (grey) or not (red). From Morbidelli (2004). ...
The Solar Tachocline: A Self-Consistent Model of Magnetic
... In Part I we review current knowledge of the Sun’s rotation. We summarise the main mechanisms by which angular momentum is transported within the Sun, and discuss the difficulties in reconciling the observed uniform rotation of the radiative interior with purely hydrodynamical theories. Following Go ...
... In Part I we review current knowledge of the Sun’s rotation. We summarise the main mechanisms by which angular momentum is transported within the Sun, and discuss the difficulties in reconciling the observed uniform rotation of the radiative interior with purely hydrodynamical theories. Following Go ...
EOS Experts Guide - by topic and by name
... Brief biographies of scientists from the three EOS centers — the Earth Systems Research Center, Ocean Process Analysis Laboratory, and the Space Science Center — provide areas of specialty, research interests, credentials, and contact information. Experts can also be found by means of an alphabetica ...
... Brief biographies of scientists from the three EOS centers — the Earth Systems Research Center, Ocean Process Analysis Laboratory, and the Space Science Center — provide areas of specialty, research interests, credentials, and contact information. Experts can also be found by means of an alphabetica ...
Radial transport in the solar nebula: Implications for moderately
... MRI to operate, however, the gas must be sufficiently ionized to couple to local magnetic fields, which happens only at the extreme inner regions of the disk where temperatures are in excess of ~1000 K such that ionization is achieved through molecular collisions, and in the very outer parts of the ...
... MRI to operate, however, the gas must be sufficiently ionized to couple to local magnetic fields, which happens only at the extreme inner regions of the disk where temperatures are in excess of ~1000 K such that ionization is achieved through molecular collisions, and in the very outer parts of the ...
- Repository of the Academy`s Library
... (gas plus magnetic) pressure, and with the plasma inertia, caused by the frozen-in condition (perpendicular motions of the plasma lead to the change of the magnetic field geometry, and the other way around). MHD waves have been intensively studied in the Earth’s magnetosphere for several decades. In ...
... (gas plus magnetic) pressure, and with the plasma inertia, caused by the frozen-in condition (perpendicular motions of the plasma lead to the change of the magnetic field geometry, and the other way around). MHD waves have been intensively studied in the Earth’s magnetosphere for several decades. In ...
VENUS EXPRESS brochure 3 - VIRTIS
... been specifically chosen to learn as much as possible about the planet and to maximise the scientific return from the mission. It prescribes an ellipse which is ‘locked’ in space with respect to fixed stars, while the planet slowly rotates below it. During the course of the first full Venusian day ( ...
... been specifically chosen to learn as much as possible about the planet and to maximise the scientific return from the mission. It prescribes an ellipse which is ‘locked’ in space with respect to fixed stars, while the planet slowly rotates below it. During the course of the first full Venusian day ( ...
Multi-dimensional models of circumstellar shells around evolved
... star (Kwok et al. 1978). However, due to the much higher kinetic energy of the WR wind as compared to the wind of a post-AGB star, the shells of WR nebulae tend to be driven by an energy conserving, rather than a momentum conserving interaction, leading to higher expansion velocities (chapter 12 Kwo ...
... star (Kwok et al. 1978). However, due to the much higher kinetic energy of the WR wind as compared to the wind of a post-AGB star, the shells of WR nebulae tend to be driven by an energy conserving, rather than a momentum conserving interaction, leading to higher expansion velocities (chapter 12 Kwo ...
Shock structure and ion dynamics
... Collisionless shock is a multi-scale structure (foot, ramp, overshoot, sub-structure in the ramp). Kinetic effects responsible for the structures (reflection, gyration). Implications of the structure for kinetic effects (heating, acceleration). ...
... Collisionless shock is a multi-scale structure (foot, ramp, overshoot, sub-structure in the ramp). Kinetic effects responsible for the structures (reflection, gyration). Implications of the structure for kinetic effects (heating, acceleration). ...
FY1995 Q1 Oct-Dec NO.. - National Optical Astronomy Observatory
... elements compared to hydrogen is constant from star to star. This suggests that the cluster formation was rapid, occurring in less than the characteristic time for heavy metal enrichment by Type II supernovae. (In fact, the energetics of these supernovae may have been responsible for clearing the ga ...
... elements compared to hydrogen is constant from star to star. This suggests that the cluster formation was rapid, occurring in less than the characteristic time for heavy metal enrichment by Type II supernovae. (In fact, the energetics of these supernovae may have been responsible for clearing the ga ...
Chapter 12. Noble Gas Isotope Geochemistry
... chondrules, but its exact nature is unclear (the so-called “P1” component in meteorites appears to be essentially the same as “Q”). In contrast to ordinary chondrites, which are gas-poor, at least some enstatite chondrites also contain a significant inventory of noble gases, and their abundance patt ...
... chondrules, but its exact nature is unclear (the so-called “P1” component in meteorites appears to be essentially the same as “Q”). In contrast to ordinary chondrites, which are gas-poor, at least some enstatite chondrites also contain a significant inventory of noble gases, and their abundance patt ...
Plasmoid-induced-reconnection and fractal reconnection Kazunari Shibata and Syuniti Tanuma
... As a key to undertanding the basic mechanism for fast reconnection in solar flares, plasmoid-inducedreconnection and fractal reconnection are proposed and examined. We first briefly summarize recent solar observations that give us hints on the role of plasmoid (flux rope) ejections in flare energy r ...
... As a key to undertanding the basic mechanism for fast reconnection in solar flares, plasmoid-inducedreconnection and fractal reconnection are proposed and examined. We first briefly summarize recent solar observations that give us hints on the role of plasmoid (flux rope) ejections in flare energy r ...
Optical hydrogen absorption consistent with a thin bow shock
... have orbital periods of a few days. The large insolation of these planets results in extreme heating of their bound atmospheres and inflated radii (Burrows et al. 2007). These objects provide a view into planetary atmospheric physics that do not occur in our solar system. Some HJs are believed to be ...
... have orbital periods of a few days. The large insolation of these planets results in extreme heating of their bound atmospheres and inflated radii (Burrows et al. 2007). These objects provide a view into planetary atmospheric physics that do not occur in our solar system. Some HJs are believed to be ...
Feedback from winds and supernovae in massive stellar clusters – I
... That stellar winds play a significant role in stellar cluster feedback is apparent from the fact that many young (pre-SN) massive star-forming regions contain diffuse X-ray emission – the hot gas responsible can only have been created by winds. Observations reveal that the surrounding cold molecular ...
... That stellar winds play a significant role in stellar cluster feedback is apparent from the fact that many young (pre-SN) massive star-forming regions contain diffuse X-ray emission – the hot gas responsible can only have been created by winds. Observations reveal that the surrounding cold molecular ...
Flare Observations
... sources appear before the hard X-ray emission in chromospheric footpoints, major flare acceleration sites appear to be independent of coronal mass ejections (CMEs), electrons, and ions may be accelerated at different sites, there are at least 3 different magnetic topologies, and basic characteristic ...
... sources appear before the hard X-ray emission in chromospheric footpoints, major flare acceleration sites appear to be independent of coronal mass ejections (CMEs), electrons, and ions may be accelerated at different sites, there are at least 3 different magnetic topologies, and basic characteristic ...
Analytical estimates of the resistivity due to ion
... Lorentzian plasma is strongly dependent on the electron drift velocity, and can vary by a factor of 100 for a 1.5 increase in the electron drift velocity. 5. Anomalous resistivity seen in 1-D simulation 6. Resistivity I) Corona = 0.1 m, II) Magnetosphere = 0.001 m ...
... Lorentzian plasma is strongly dependent on the electron drift velocity, and can vary by a factor of 100 for a 1.5 increase in the electron drift velocity. 5. Anomalous resistivity seen in 1-D simulation 6. Resistivity I) Corona = 0.1 m, II) Magnetosphere = 0.001 m ...
astronomy beat - Astronomical Society of the Pacific
... sometimes they put on a great show. But not Elenin. Right now that comet looks kind of wimpy. Some cometary visitors arriving from beyond the planetary region —like Hale-Bopp in 1997 — have really lit up the night sky where you can see them easily with the naked eye. But Elenin is trending toward t ...
... sometimes they put on a great show. But not Elenin. Right now that comet looks kind of wimpy. Some cometary visitors arriving from beyond the planetary region —like Hale-Bopp in 1997 — have really lit up the night sky where you can see them easily with the naked eye. But Elenin is trending toward t ...
Foreword You`ll notice here that I hardly make mention of gravity, if
... heavenly bodies out in space attract and repel each other and establish complex magnetic relationships. On Earth, much of the so-called gravity is simply atmospheric pressure that gives weight to small (relative to the planet) objects and alongside its magnetic field keeps them on its surface - much ...
... heavenly bodies out in space attract and repel each other and establish complex magnetic relationships. On Earth, much of the so-called gravity is simply atmospheric pressure that gives weight to small (relative to the planet) objects and alongside its magnetic field keeps them on its surface - much ...
16. Composition of solar system small bodies Pierre Vernazza Aix
... some 4.6 Gyrs ago. The small bodies that have survived since that epoch, however, have experienced numerous collisional, dynamical, and thermal events that have shaped their present-day physical and orbital properties. Interpreting this record via observations, laboratory studies, and theoretical/nu ...
... some 4.6 Gyrs ago. The small bodies that have survived since that epoch, however, have experienced numerous collisional, dynamical, and thermal events that have shaped their present-day physical and orbital properties. Interpreting this record via observations, laboratory studies, and theoretical/nu ...
PDF only - at www.arxiv.org.
... models of radiation-driven accretion disk winds (17). An independent corroboration of the above estimate comes from the variability timescale of ~1 week of the Fe-K absorption feature, probed during the monitoring of PDS 456 by the Suzaku X-ray satellite in early 2013 (18). Indeed, the historical be ...
... models of radiation-driven accretion disk winds (17). An independent corroboration of the above estimate comes from the variability timescale of ~1 week of the Fe-K absorption feature, probed during the monitoring of PDS 456 by the Suzaku X-ray satellite in early 2013 (18). Indeed, the historical be ...
Statistical survey of widely spread out solar electron events
... Context. In February 2011, the two STEREO spacecrafts reached a separation of 180 degrees in longitude, offering a complete view of the Sun for the first time ever. When the full Sun surface is visible, source active regions of solar energetic particle (SEP) events can be identified unambiguously. ST ...
... Context. In February 2011, the two STEREO spacecrafts reached a separation of 180 degrees in longitude, offering a complete view of the Sun for the first time ever. When the full Sun surface is visible, source active regions of solar energetic particle (SEP) events can be identified unambiguously. ST ...
SOLAR HARD X-RAY AND GAMMA-RAY OBSERVATIONS FROM
... e.g., Ramaty & Murphy 1987 for a review). If the spectrum of accelerated ions extends above a few hundred MeV nucleons -1 , the energetic neutrons produced in nuclear reactions ...
... e.g., Ramaty & Murphy 1987 for a review). If the spectrum of accelerated ions extends above a few hundred MeV nucleons -1 , the energetic neutrons produced in nuclear reactions ...
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.