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1921. A Paper Sundial
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Ссылки http://www.cosmos.ru/mirrors/stern/stargaze/Sdial2.htm -- 1.3 Кб -- 22.12.2007
[ Сохраненная копия ] Ссылки http://www.cosmos.ru/mirrors/stern/stargaze/Sdial2S.htm -- 1.3 Кб -- 22.12.2007
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[ Сохраненная копия ] Ссылки http://www.cosmos.ru/mirrors/stern/stargaze/Sdial2S.htm -- 1.3 Кб -- 22.12.2007
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1922. Explaining the Sundial
... At the summer date, at the chosen time, the Sun is high in the sky. at point S, while at the winter date, it is low in the sky, at point W. The shadow of the gnomon is always in the plane containing the Sun and the points A and B. If AB is a thin line, the shadow will also be a thin line, the intersection of this plane with the base of the sundial. ... Summer or winter, the shadow is therefore along the same line, the intersection of the above plane and the base of the sundial. ...
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Ссылки http://www.cosmos.ru/mirrors/stern/stargaze/Sdial1.htm -- 4.6 Кб -- 22.12.2007
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1923. The Brightest Moon
... Since moonshine is really reflected sunlight, the full Moon is on the average slightly brighter in mid-winter, when Earth is closest to the Sun. In addition, the distance of the full Moon also varies, due to the ellipticity ("eccentricity") of the Moon's orbit. On 22 December, 1999, the two effects combined to produce the brightest full Moon of the century. ... This year will be the first full moon to occur on the winter solstice, Dec. 22nd, commonly called the first day of winter. ...
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Ссылки http://www.cosmos.ru/mirrors/stern/stargaze/Smoon3.htm -- 4.9 Кб -- 22.12.2007
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1924. Polar Cap -- History
... Elsewhere in the tank he mounted an "electron gun" like the one found in TV picture tubes--a hot wire emitting electrons, and plates charged to positive voltages to pull them out and speed them on their way. ... On the other hand, the electrons of the polar rain (see files linked to the bottom of this page), which apparently did come from the Sun, were indeed found in patches surrounding the magnetic poles, exactly like the patches of light Birkeland observed on his terrella. ...
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Ссылки http://www.cosmos.ru/mirrors/stern/earthmag/whpcap.htm -- 4.9 Кб -- 22.12.2007
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1925. Gauss and the Global Magnetic Field
... Als junger Mann erkundete Alexander die Dschungel S damerikas, doch verbrachte er einen Gro teil seines Lebens in Paris, wo er unerm dlich die Aufmerksamkeit der ffentlichkeit auf die Errungenschaften der Naturwissenschaften lenkte. ... Das magnetische Feld w rde jedoch nicht ganz verschwinden, da die anderen Feldkomponenten (der 4-Pol usw.) sich inzwischen verst rken w rden, und, wie Ned Benton gezeigt hat, die Gesamtsumme der magnetischen Energie praktisch unver ndert bliebe. ...
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Ссылки http://www.cosmos.ru/mirrors/stern/earthmag/Dgauss.htm -- 7.5 Кб -- 22.12.2007
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1926. The Great Magnet, the Earth" -- Site Map
Home page and Introduction to "De Magnete" , English . Home page and Introduction to "De Magnete" , -- Spanish . Home page and Introduction to "De Magnete" , -- German . Home page and Introduction to "De Magnete" , -- French . A review of "De Magnete" . Another review of "De Magnete" . ... More about "De Magnete" . Performing Gilbert's Experiment on Induced Magnetism . ... Gauss and the Global Magnetic Field . ... The Self-Sustaining Dynamo in the Earth's Core . ...
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Ссылки http://www.cosmos.ru/mirrors/stern/earthmag/dmgmap.htm -- 5.7 Кб -- 22.12.2007
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1927. http://www.cosmos.ru/mirrors/stern/earthmag/Svitae.htm
... Physics . ... Electrodynamics and magnetic field of the Earth's magnetosphere. ... Until his retirement in 2001, Stern was associated with GSFC, studying theoretical aspects of Earth's magnetosphere, in particular its large-scale electrodynamics, global description of its magnetic fields and particle motion. ... The first one (non-mathematical) covers magnetospheric physics, is titled " The Exploration of the Earth's Magnetosphere " and its home page is at http://www.phy6.org/Education/Intro.html . ...
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Ссылки http://www.cosmos.ru/mirrors/stern/earthmag/Svitae.htm -- 10.5 Кб -- 22.12.2007
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1928. Millennium of Geomagnetism: Magnetism of other planets
... Early discoveries . ... Faraday's Lines of Force (field lines) . ... The Earth's Dynamo . ... It thus came as a surprise that other planets of the solar system, very different from Earth, also had their own magnetic fields [Bagenal, 1992; see table below]. ... Magnetic Moment/M Earth . ... Table 2: Magnetic Fields of Earth and of the Giant Planets [from Bagenal, 1992] . ... Thus, as the study of planetary magnetic field enters its second millennium, it faces more unanswered riddles than ever before....
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Ссылки http://www.cosmos.ru/mirrors/stern/earthmag/mill_8.htm -- 17.6 Кб -- 22.12.2007
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1929. Millennium of Geomagnetism: The Earth's magnetosphere
... Early discoveries . ... Faraday's Lines of Force (field lines) . ... The Earth's Dynamo . ... Magnetic Storms and Ring Currents . ... The sudden confinement was expected to compress the Earth's field lines, and explained a small abrupt jump in magnetic intensity ("sudden commencement") observed on the surface at the start of many magnetic storms. ... Fig.14 Magnetic field lines and the bow shock (not a field line) in the Earth's magnetosphere, with some named features (not to scale). ...
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Ссылки http://www.cosmos.ru/mirrors/stern/earthmag/mill_7.htm -- 25.4 Кб -- 22.12.2007
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1930. Millennium of Geomagnetism
... Volcanoes are often active for long periods, and by comparing the magnetization of their lava flows from different times (especially if such flows can be dated by some method) one can learn about changes in the direction of the local magnetic field. ... Meanwhile, in the early years of the 20th century, a German meteorologist, geophysicist and polar explorer named Alfred Wegener (1880-1930) proposed a radical new idea [Hallam, 1973; Georgi, 1962; Kious and Tilling, 1996; Oreskes, 1999, 2000]. ...
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Ссылки http://www.cosmos.ru/mirrors/stern/earthmag/mill_6.htm -- 17.4 Кб -- 22.12.2007
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1931. Millennium of Geomagnetism
... Faraday's Lines of Force (field lines) . ... Sunspots . The Dynamo Process on the Sun . The Earth's Dynamo . ... And not only did the Sun have a magnetic field, but concentrated sources of that field--dark sunspots--were visible on its surface, quite unlike the sources of the Earth's field which are buried deep in the Earth's core. ... As some solar wind ions move out radially to the Earth's orbit and beyond, others on the same field lines but deeper in the Sun's atmosphere stay behind. ...
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Ссылки http://www.cosmos.ru/mirrors/stern/earthmag/mill_5.htm -- 28.5 Кб -- 22.12.2007
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1932. Millennium of Geomagnetism
... Faraday's Lines of Force (field lines) . ... The Earth's Dynamo . ... That Gauss did, together with his young assistant Wilhelm Weber (1804-91), contributing greatly to the understanding of the Earth's magnetic field [Garland, 1979]. ... In 1832 Gauss and Weber also devised a clever method of using an auxiliary magnet to measure not only the direction of the Earth's magnetic force, but also its intensity. ... 6 Magnetic field lines of a magnetic dipole at the center of the Earth. ...
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Ссылки http://www.cosmos.ru/mirrors/stern/earthmag/mill_4.htm -- 30.3 Кб -- 22.12.2007
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1933. Millennium of Geomagnetism
... Halley . ... Magnetic Storms and Ring Currents . ... Magnetic Reconnection . ... Chronology of Geomagnetism . ... A magnetic needle was suspended from a long thin twistable wire--long enough and thin enough that even a small torque produced a notable twist. ... The magnetism of iron, Amp re implied, may have come about because iron atoms contained small circulating currents, which could be lined up so that they reinforced each other [see also Livingston, 1996]. ...
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Ссылки http://www.cosmos.ru/mirrors/stern/earthmag/mill_3.htm -- 23.8 Кб -- 22.12.2007
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1934. Millennium of Geomagnetism
... Early discoveries . William Gilbert . ... It marked 400 years since William Gilbert published in London his book De Magnete (Latin for "On the Magnet") [Gilbert, 1600; see also Barraclough, 2000; Schr der, 2000; Chapman, 1944; Watson, 1944], proposing among other things that the Earth itself was a giant magnet, thus explaining the strange directivity of the compass needle (Figure 1). ... Gilbert guessed that the reason the compass needle pointed north was that the Earth itself was a giant magnet. ...
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Ссылки http://www.cosmos.ru/mirrors/stern/earthmag/mill_2.htm -- 18.6 Кб -- 22.12.2007
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1935. http://www.cosmos.ru/mirrors/stern/stargaze/Svitae.htm
... Physics . ... Electrodynamics and magnetic field of the Earth's magnetosphere. ... Until his retirement in 2001, Stern was associated with GSFC, studying theoretical aspects of Earth's magnetosphere, in particular its large-scale electrodynamics, global description of its magnetic fields and particle motion. ... The first one (non-mathematical) covers magnetospheric physics, is titled " The Exploration of the Earth's Magnetosphere " and its home page is at http://www.phy6.org/Education/Intro.html . ...
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Ссылки http://www.cosmos.ru/mirrors/stern/stargaze/Svitae.htm -- 10.7 Кб -- 22.12.2007
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1936. Glosario
... The true anomaly f equals the polar angle f in polar coordinates with origin at the center of the motion (e.g. Sun or Earth). ... Mean Sun-Earth distance, used as scaling distance in the solar system. ... Because of its lightweight construction it needs no staging to achieve Earth orbit, but only drops two of its engines. ... When one of the frames is accelerated, however, the two are not equivalent: Earth rotating around its axis fits Newtonian mechanics, the Sun going around a fixed Earth does not...
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Ссылки http://www.cosmos.ru/mirrors/stern/stargaze/Mgloss.htm -- 128.8 Кб -- 22.12.2007
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1937. Mass--Lesson Plan #26
Lesson Plan #26 http://www.phy6.org/stargaze/Lmass.htm . A qualitative discussion of the distinction between weight and mass, followed by a description of astronaut mass measurements in a zero-g environment, conducted in 1973. ... Mass Aboard Skylab" section #17a: . ... Learn that in oscillations of a mass against an elastic spring--in the absence of gravity, or in horizontal motion--the length of the oscillation period is proportional to the square root of the mass. ... Weight causes motion. ...
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Ссылки http://www.cosmos.ru/mirrors/stern/stargaze/ILmass.htm -- 14.3 Кб -- 22.12.2007
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1938. The Way Things Fall--Lesson Plan #22
An introduction to the concept of acceleration and to motion under the influence of gravity, starting with free fall and ending with motions that start out with both horizontal and vertical initial velocities. ... This lesson plan supplements: "The Way Things Fall" section #13: on disk Sfall.htm , on the web . ... Light and heavy objects fall at the same rate, as established experimentally by Galileo. ... What can you say about the acceleration of a freely falling object? ... The same way. ...
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Ссылки http://www.cosmos.ru/mirrors/stern/stargaze/ILfall.htm -- 16.6 Кб -- 22.12.2007
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1939. La Tangente
... La tangente es una herramienta de trigonometr a relacionada con el seno y el coseno. ... Sean tambi n a, b y c las longitudes de sus tres lados: a del lado opuesto a A, b del lado opuesto a B, y c , el m s largo, opuesto a C. Dos razones tiles asociadas con el ngulo A ("funciones trigonom tricas de A ") son: . ... Estas dos razones implican al lado largo c ("hipotenusa", en lenguaje matem tico), y por cuanto a y b deben ser m s peque os que ese lado, estas razones son siempre n meros menores que 1. ...
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Ссылки http://www.cosmos.ru/mirrors/stern/stargaze/Mtrig7.htm -- 8.3 Кб -- 22.12.2007
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1940. Ejercicios de Trigonometr a
Mapa del sitio . ... En algunos casos se dan las soluciones, pero no las mire hasta que haga los esfuerzos necesarios para resolverlas usted mismo . ... Asumimos que dispone de una calculadora que puede deducir senos y cosenos y que tambi n dispone de las funciones sen -1 y cos -1 que sirven para encontrar el ngulo A a partir del senA o el cosA, en la gama de 0 a 180 grados. ... Los tres ngulos (A',C,B') suman 180 , debido a que son adyacentes entre si y formados por una l nea recta. ...
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Ссылки http://www.cosmos.ru/mirrors/stern/stargaze/Mtrig6.htm -- 15.7 Кб -- 22.12.2007
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