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Topic: Numerical model of solar system

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  Solar System / Planets K-12 Experiments for Lesson Plans & Science Fair Projects
The inner solar system was too warm for volatile molecules like water and methane to condense, and so the planetesimals which formed there were relatively small (comprising only 0.6% the mass of the disc) and composed largely of compounds with high melting points, such as silicates and metals.
The point at which the solar system ends and interstellar space begins is not precisely defined, since its outer boundaries are delineated by two separate forces: the solar wind and the Sun's gravity.
The immediate galactic neighborhood of the solar system is known as the Local Fluff, an area of dense cloud in an otherwise sparse region known as the Local Bubble, an hourglass-shaped cavity in the interstellar medium roughly 300 light-years across.
www.juliantrubin.com /encyclopedia/astronomy/solarsystem.html   (7187 words)

 Solar system   (Site not responding. Last check: 2007-10-11)
"the Alpha Centauri system" or "the 51 Pegasi system").
In broad terms, the solar system consists of the Sun, eight bodies in relatively unique orbits (commonly called planets or major planets) and two belts of smaller objects (which can be called minor planets, planetoids, meteoroids, planetesimals or, in the case of Pluto, planets).
The solar system is part of the Milky Way galaxy, a spiral galaxy with a diameter of about 100,000 light years containing approximately 200 billion stars, of which our Sun is rather large and bright.
abcworld.net /Solar_system.html   (4495 words)

 Numerical model of solar system - Wikipedia, the free encyclopedia
A numerical model of the solar system is a set of mathematical equations, which, when solved, give the positions of the planets as a function of time.
In essence this mathematical simulation of the solar system is a form of the N-body problem.
For example for distances in the solar system the astronomical unit is most straightforward.
en.wikipedia.org /wiki/Numerical_model_of_solar_system   (1533 words)

 directopedia : Directory : Science : Astronomy : Solar System
In broad terms, the charted regions of our solar system consist of the Sun and its planetary system: the eight bodies in relatively unique orbits (commonly called planets or major planets) and two belts of smaller objects (which can be called minor planets, planetoids, meteoroids, planetesimals or, in the case of Pluto, planets).
In the outer regions of this solar nebula, ice and volatile gases were able to survive, and as a result, the inner planets are rocky and the outer planets were massive enough to capture large amounts of lighter gases, such as hydrogen and helium.
Pluto, the solar system's smallest planet, is considered to be part of the Kuiper Belt population.
www.directopedia.org /directory/Science-Astronomy/Solar_System.shtml   (6251 words)

 National Solar Radiation Data Base User's Manual
Because of the difficulties frequently encountered when measuring solar radiation and the resultant unknown quality of some solar radiation data (see Section 4.0), a major effort was undertaken to develop procedures and software for performing post-measurement quality assessment of these data.
The general or optimum uncertainties of METSTAT estimates of solar radiation were based on the optimum uncertainties of the measured data used during the development of the model and evaluations of the model performance under cloudless skies.
Because the METSTAT model was based on limited quantities of measured data, the uncertainty of model estimates could not be less than the uncertainty of the measured data.
rredc.nrel.gov /solar/pubs/NSRDB/data_base.html   (4893 words)

 Solar System Long Term Science Review   (Site not responding. Last check: 2007-10-11)
This requires the coupling of models of the Sun, the solar wind and the Earth’s atmosphere and its environment, together with a coherent analysis of a wide range of data, obtained both from space and the ground.
The UK strength in solar terrestrial physics is demonstrated by the fact that we have the greatest number of PIs on the Cluster mission and that the UK was behind most of the significant advances made in recent years.
Models of the upper atmosphere are used by industry to predict the orbit decay of satellites, providing essential information for the space industry when they plan the de-orbiting of spacecraft to prevent space debris.
www.pparc.ac.uk /Rs/Pp/Sp/SolarLTSR.asp   (12923 words)

 Orrery : Solar System Simulator
This is a model of the Solar system and beyond.
The model can be speeded up if the moons are left out (This is necessary due to limitations of the numerical method).
Should not be necessary since the models are now sized to fill 100% of the browser window (except for the example which is 400 X 500).
www.cuug.ab.ca /~kmcclary/ORRERY/index.html   (1151 words)

 Solar Water
Solar thermal systems that produce potable water from salty water have been studied for quite some years, and the use of solar energy to produce potable water reverts back to ancient Egypt.
As solar radiation hits the collector, the working fluid (an oil) is heated up and moves, by natural convection, to the highest point of the system where a heat exchanger is located.
Other data used in the simulation are: one solar collector with an area of 2m2 with an average thermal efficiency of 0.5; the lateral and cover walls are insulated with 0.07m mineral wool layers; the amount of water in each stage is 25 L; and six stages are used.
www.ecosustainablevillage.com /solar_water_desalination.htm   (6301 words)

 Zoe Malka Leinhardt
Traditionally, numerical simulations of planet formation have used extrapolations of impact experiments in the strength regime to model the effects of fragmentation in planetesimal collisions.
The planetesimals are modeled as rubble piles which are gravitational aggregates of indestructible particles bound together purely by gravity.
The collision model is based on the rubble-pile planetesimal model developed and investigated in the parameter space studies summarized above.
www.people.fas.harvard.edu /~zmleinh/research/planet.html   (704 words)

 Zhu's whatever   (Site not responding. Last check: 2007-10-11)
Other stellar systems or planetary systems are usually referred to by the names of their parent star; "the Alpha Centauri system" or "the 51 Pegasi system".
The solar wind extends to a point roughly 130 AU from the Sun, whereupon it surrenders to the surrounding environment of the interstellar medium.
This great mass of up to a trillion icy objects, currently hypothetical, is believed to be the source for all long-period comets and to surround the solar system like a shell from 50,000 to 100,000 AU beyond the Sun, or almost a quarter the distance to the next star system.
rhennami.blog.com /1108962   (6566 words)

 Zoe Malka Leinhardt   (Site not responding. Last check: 2007-10-11)
However, our current models of planet formation are unable to produce such a diverse range of solar systems.
Terrestrial Planet Formation - In order to determine the ease with which terrestrial planets form it is necessary to begin with an accurate model of solar system formation.
To create an accurate numerical model of solar system formation it is necessary to understand how planetesimals, the planetary building blocks, evolve and grow into larger bodies.
www.people.fas.harvard.edu /~zmleinh   (384 words)

 Solar Irradiance and Long-Term Climate Variability
A long-term program of monitoring the solar irradiance from space will provide the answers as far as the sun itself is concerned, but the climatic effects of solar variations are likely to be increasingly difficult to isolate in the future, as anthropogenic forcing becomes stronger.
The use of other stars to infer solar variability has been questioned by Schatten [1993], however, who has pointed out that the observed irradiance is likely to be a function of the heliographic latitude of the observer, being a minimum near the solar equatorial plane, where the Earth is located.
Using a simple one-dimensional model of the ocean's thermal structure, he calculated that variations in solar irradiance of several tenths of a percent on the time scale of decades to centuries would be needed to explain the effect, assuming that no other causes of temperature change were in operation.
www.agu.org /revgeophys/reid00/node2.html   (1525 words)

 NGDC/WDC STP, Boulder-Solar Ultraviolet (UV) Spectral Irradiance Data via FTP from NGDC
Plots of five solar cycles of the daily F10.7 cm solar radio data adjusted to 1 AU, the E10.7 EUV proxy index, and a Lyman-alpha index (from Mg II index) are available.
The Mg II core-to-wing ratio is derived from the ratio of the h and k lines of the solar Mg II feature at 280 nm to the background or wings at approximately 278 nm and 282 nm.
The spectra and model are based on rocket measurements and simultaneously obtained EUV fluxes by the AE-C and AE-E spectrometer.
www.ngdc.noaa.gov /stp/SOLAR/ftpsolaruv.html   (2512 words)

 Build a Solar System
If you build your solar system on a roll of toilet paper, you can make the Sun about.4 inches (10 mm) across and still fit the entire solar system on the roll.
The models they displayed usually had the sizes of the planets to scale, but the distances between them were a completly different scale, giving the impression of a rather close-knit family.
I made my first scale model on a roll of teletype paper tape (anyone remember that stuff?) On this 1-inch tape, my Sun was the size of the tape - 1 inch in diameter.
www.exploratorium.edu /ronh/solar_system   (585 words)

 A Scale Model of the Solar System
This applet is the obligatory scale model of the solar system.
The sun remains in the center; there are no controls yet to change that, or to change the distance from the sun.
NASA's java solar system takes a different approach to displaying the planet's orbits.
www.burtleburtle.net /bob/physics/solar.html   (564 words)

 Solar System Live Details
They assemble a request which is sent, using the CGI mechanism, to a server application written in C. The server, given the viewing parameters you selected in the HTML file, creates a GIF image of the requested view, then returns an HTML document which references the GIF file as an in-line image.
As mentioned above, Pluto's orbit is not known with sufficient accuracy to permit analytic extrapolation beyond the period from 1885 through 2099, and I'm not about to perform a numerical integration of solar system motion, now matter how nicely you ask.
When new management arrived at Autodesk, one of their first actions was to terminate the Science Series, along with a number of other products, some profitable, which did not “meet the business model”.
www.fourmilab.ch /solar/details.html   (600 words)

 Solar system model - Wikipedia, the free encyclopedia
2 A model based on a classroom globe
[edit] A model based on a classroom globe
[edit] A model based on a sports field
en.wikipedia.org /wiki/Solar_system_model   (814 words)

 Portal de Astronomia Numerica — Portal de Astronomia Numerica   (Site not responding. Last check: 2007-10-11)
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www.iafe.uba.ar /plasmas/solar_dyn.html   (101 words)

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