Main-belt comets as tracers of ice in the inner Solar system
... served comet-like activity (e.g., Tóth 2000). However, observations of renewed activity in 2002 and 2007 (Hsieh et al. 2004, 2010; Lowry & Fitzsimmons 2005) rendered that explanation highly implausible. While recurrent activity (with intervening periods of inactivity) is commonly observed for class ...
... served comet-like activity (e.g., Tóth 2000). However, observations of renewed activity in 2002 and 2007 (Hsieh et al. 2004, 2010; Lowry & Fitzsimmons 2005) rendered that explanation highly implausible. While recurrent activity (with intervening periods of inactivity) is commonly observed for class ...
Probing the high- energy universe What is the Cherenkov Telescope
... The total Cherenkov radiation in the atmosphere is about 10,000 times fainter than the total starlight, so large mirrors are required to collect it, and because the flashes last only a few billionths of a second, high-speed ‘cameras’ are used to record them. CTA will achieve its unprecedented level ...
... The total Cherenkov radiation in the atmosphere is about 10,000 times fainter than the total starlight, so large mirrors are required to collect it, and because the flashes last only a few billionths of a second, high-speed ‘cameras’ are used to record them. CTA will achieve its unprecedented level ...
The Sun - Our Star - Sierra College Astronomy Home Page
... live longer than active prominences above active regions. CME When a prominence reaches about 50,000 km it erupts sending gas into interplanetary space with speeds in excess of 1000 km/s. These eruptions are called coronal mass ejections. ...
... live longer than active prominences above active regions. CME When a prominence reaches about 50,000 km it erupts sending gas into interplanetary space with speeds in excess of 1000 km/s. These eruptions are called coronal mass ejections. ...
or view
... the martian surface in the distant past is well established, but the total amount of water and the periods of activity are still controversial (Carr, 1996). Observation of D/H is thus particularly important for reconstructing the history of water on Mars. For this, the fundamental 3.7 µm HDO band wa ...
... the martian surface in the distant past is well established, but the total amount of water and the periods of activity are still controversial (Carr, 1996). Observation of D/H is thus particularly important for reconstructing the history of water on Mars. For this, the fundamental 3.7 µm HDO band wa ...
Eclipsmart Travel Scope 50 Manual
... Sunspots can be big. Very big. They can range in size from 10 to 100,000 miles (16 to 160,000 km) in diameter. To put that into perspective, the Earth is only 8,000 miles (12,800 km) in diameter! Compare sunspot sizes to the relative size of the Earth in the image below in order to better grasp the ...
... Sunspots can be big. Very big. They can range in size from 10 to 100,000 miles (16 to 160,000 km) in diameter. To put that into perspective, the Earth is only 8,000 miles (12,800 km) in diameter! Compare sunspot sizes to the relative size of the Earth in the image below in order to better grasp the ...
31. Deserts and Wind (p. 517-533)
... and deposits sand around it, which accumulates and builds up into a mound. As the mound gets bigger, it acts as a barrier to the wind, causing it to slow down and deposit even more sand. In profile, a dune is asymmetrical. The side facing the wind has a shallow slope and is called the ______________ ...
... and deposits sand around it, which accumulates and builds up into a mound. As the mound gets bigger, it acts as a barrier to the wind, causing it to slow down and deposit even more sand. In profile, a dune is asymmetrical. The side facing the wind has a shallow slope and is called the ______________ ...
Word format
... and deposits sand around it, which accumulates and builds up into a mound. As the mound gets bigger, it acts as a barrier to the wind, causing it to slow down and deposit even more sand. In profile, a dune is asymmetrical. The side facing the wind has a shallow slope and is called the ______________ ...
... and deposits sand around it, which accumulates and builds up into a mound. As the mound gets bigger, it acts as a barrier to the wind, causing it to slow down and deposit even more sand. In profile, a dune is asymmetrical. The side facing the wind has a shallow slope and is called the ______________ ...
Broggini
... 0.86 10-6 cm-2s-1 (> 1 keV), 3 orders of magnitude reduction Gamma rays: only 1 order of magnitude reduction, but with thick shield about 5 orders of magnitude in the region of natural radioactivity and 4-5 orders above 3.2 MeV without any shield Alpha particles: factor ~15 below 3 MeV (shielded Si ...
... 0.86 10-6 cm-2s-1 (> 1 keV), 3 orders of magnitude reduction Gamma rays: only 1 order of magnitude reduction, but with thick shield about 5 orders of magnitude in the region of natural radioactivity and 4-5 orders above 3.2 MeV without any shield Alpha particles: factor ~15 below 3 MeV (shielded Si ...
Timescales for the evolution of oxygen isotope compositions in the
... compositions of nitrogen (Hashizume et al., 2000) and carbon (Hashizume et al., 2004) and they inferred that the observed 16O-enriched component had a solar origin. However, Ireland et al. (2006) came to a contrasting conclusion from the finding of a 16O-depleted component (D17O = +26 ± 3&) at the su ...
... compositions of nitrogen (Hashizume et al., 2000) and carbon (Hashizume et al., 2004) and they inferred that the observed 16O-enriched component had a solar origin. However, Ireland et al. (2006) came to a contrasting conclusion from the finding of a 16O-depleted component (D17O = +26 ± 3&) at the su ...
Understanding the Universe from Deep Underground
... CONCLUSIONS - Particle Astrophysics is an exciting field where measurements are helping us to understand our Universe more completely on scales reaching from the very small to the farthest reaches in space and the earliest times. - Going underground can enable scientists to make unique measurements ...
... CONCLUSIONS - Particle Astrophysics is an exciting field where measurements are helping us to understand our Universe more completely on scales reaching from the very small to the farthest reaches in space and the earliest times. - Going underground can enable scientists to make unique measurements ...
Oxygen and Neon Abundances of B-Type Stars in Comparison with
... help of Napiwotzki, Scönberner, and Wenske’s (1993) uvbybetanew program,5 which is based on Moon’s (1985) UVBYBETA (estimation of intrinsic colors corrected for interstellar reddening) and TEFFLOGG (Teff =logg determination from dereddened colors) programs. The observational data of b y, c1 , m1 , ...
... help of Napiwotzki, Scönberner, and Wenske’s (1993) uvbybetanew program,5 which is based on Moon’s (1985) UVBYBETA (estimation of intrinsic colors corrected for interstellar reddening) and TEFFLOGG (Teff =logg determination from dereddened colors) programs. The observational data of b y, c1 , m1 , ...
The surface composition of Beta Pictoris
... has prompted King and Patten (1992) to suggest that β Pic is a λ Boo star. We note that the HST GHRS data analyzed by Lanz and Hubeny (1995) also rule out a low metallicity, and that their own evaluation of Geneva indices leads to a normal rather than subsolar iron abundance. Why does the signature ...
... has prompted King and Patten (1992) to suggest that β Pic is a λ Boo star. We note that the HST GHRS data analyzed by Lanz and Hubeny (1995) also rule out a low metallicity, and that their own evaluation of Geneva indices leads to a normal rather than subsolar iron abundance. Why does the signature ...
Resources: - Real Science
... sun affects the earth and the rest of the solar system. The research was led by Steve Tomczyk of the National Center for Atmospheric Research (NCAR). It is published this week in Science. "Alfvén waves can provide us with a window into processes that are fundamental to the workings of the sun," says ...
... sun affects the earth and the rest of the solar system. The research was led by Steve Tomczyk of the National Center for Atmospheric Research (NCAR). It is published this week in Science. "Alfvén waves can provide us with a window into processes that are fundamental to the workings of the sun," says ...
Resources: - Real Science
... sun affects the earth and the rest of the solar system. The research was led by Steve Tomczyk of the National Center for Atmospheric Research (NCAR). It is published this week in Science. "Alfvén waves can provide us with a window into processes that are fundamental to the workings of the sun," says ...
... sun affects the earth and the rest of the solar system. The research was led by Steve Tomczyk of the National Center for Atmospheric Research (NCAR). It is published this week in Science. "Alfvén waves can provide us with a window into processes that are fundamental to the workings of the sun," says ...
An Analysis of the Behavior of Vela X-1
... – Flare behavior for 1-10 keV range is consistent with Kreykenbohm’s 20-40 keV data. – Hardness plots for flaring behavior were just the opposite of the Kreykenbohm results!!!! – Result: we have evidence that (1) supports the flare models but (2) is inconsistent with hardness plot results found by t ...
... – Flare behavior for 1-10 keV range is consistent with Kreykenbohm’s 20-40 keV data. – Hardness plots for flaring behavior were just the opposite of the Kreykenbohm results!!!! – Result: we have evidence that (1) supports the flare models but (2) is inconsistent with hardness plot results found by t ...
study of the extensive air shower size and the energy spectra of
... Cosmic ray particles at sea level include charged hadrons, neutrons, gamma rays, electrons, muons, nuclei and antinucleons. The probability of surviving from the point of production to sea level depends on the particle type, its charge state, energy, zenith angle of propagation and mean lifetime at ...
... Cosmic ray particles at sea level include charged hadrons, neutrons, gamma rays, electrons, muons, nuclei and antinucleons. The probability of surviving from the point of production to sea level depends on the particle type, its charge state, energy, zenith angle of propagation and mean lifetime at ...
end-of-summer report
... sources that are faint compared to the background noise, we decided not to subtract the background. When subtracted, the total flux during an epoch was a negative value. Apparently, there are certain time periods when the background counts are ≥ the sources’ counts. The background spectra for observ ...
... sources that are faint compared to the background noise, we decided not to subtract the background. When subtracted, the total flux during an epoch was a negative value. Apparently, there are certain time periods when the background counts are ≥ the sources’ counts. The background spectra for observ ...
Grand Minima of Solar Activity and the Mean
... dominated by the 22-year cycle (Usoskin, Mursula, and Kovaltsov, 2001) with indications of the underlying 11-year cycle (Frick et al., 1997; Beer, Tobias, and Weiss, 1998; Fligge, Solanki, and Beer, 1999; Usoskin, Mursula, and Kovaltsov, 2001; Miyahara et al., 2004; Sokoloff, 2004). While the very e ...
... dominated by the 22-year cycle (Usoskin, Mursula, and Kovaltsov, 2001) with indications of the underlying 11-year cycle (Frick et al., 1997; Beer, Tobias, and Weiss, 1998; Fligge, Solanki, and Beer, 1999; Usoskin, Mursula, and Kovaltsov, 2001; Miyahara et al., 2004; Sokoloff, 2004). While the very e ...
File - INFN-LNF
... The Apollo instrument complexes operated for years with little if any problem from dust. The laser retroreflectors left there are still reflective. The instrument complexes included a dust-detector experiment on Apollos 11, 12, 14, and 15 to measure possible accumulation from the lunar module liftof ...
... The Apollo instrument complexes operated for years with little if any problem from dust. The laser retroreflectors left there are still reflective. The instrument complexes included a dust-detector experiment on Apollos 11, 12, 14, and 15 to measure possible accumulation from the lunar module liftof ...
Advanced Composition Explorer
Advanced Composition Explorer (ACE) is a NASA Explorers program Solar and space exploration mission to study matter comprising energetic particles from the solar wind, the interplanetary medium, and other sources. Real-time data from ACE is used by the NOAA Space Weather Prediction Center to improve forecasts and warnings of solar storms. The ACE robotic spacecraft was launched August 25, 1997 and entered a Lissajous orbit close to the L1 Lagrangian point (which lies between the Sun and the Earth at a distance of some 1.5 million km from the latter) on December 12, 1997. The spacecraft is currently operating at that orbit. Because ACE is in a non-Keplerian orbit, and has regular station-keeping maneuvers, the orbital parameters at right are only approximate. The spacecraft is still in generally good condition in 2015, and is projected to have enough fuel to maintain its orbit until 2024. NASA Goddard Space Flight Center managed the development and integration of the ACE spacecraft.