Sentences with phrase «precession over»

The researchers» setup could also visualize the wave - like nature of the spin precession over a few nanoseconds following the laser pulse.

After overcoming a few technical hurdles related to this circular motion, they tracked electrons» spin precession over the course of 0.7 seconds — about 1000 times longer than was previously possible with beams, which should open the way to greater sensitivity.

Not exact matches

That's key to detecting precession, because during each eclipse astronomers can determine the precise angle of the radio signal and therefore the pulsar's wobble over time.

Observations long ago revealed that the perihelion shifts over time, called precession.

If the inner flow really is precessing, it will sometimes shine on the approaching disc material and sometimes on the receding material, making the line wobble back and forth over the course of a precession cycle.

13:00 - 13:15 Precession forcing of fire activity in subtropical southern Africa over the past 170,000 years Anne - Laure Daniau, Maria Fernanda Sánchez Goñi, Philippe Martinez, Dunia H. Urrego, Viviane Bout - Roumazeilles, Stéphanie Desprat, Jennifer Marlon

Re 92 and 105: First I just want to reitterate more generally what 105 said — Milankovitch cycles have had climate signals, in ice ages or otherwise, — well probably ever since the Moon formed, although the signal from times past will not always reach us, but I've read of evidence of Milankovitch precession cycle forcing of monsoons in lakes in Pangea (PS over geologic time the periods of some of the Milankovitch cycles have changed as the Moon recedes from the Earth due to tides).

[A] tmospheric circulation over South America and monsoon intensity have been tightly correlated throughout most of the Holocene, both directly responding to solar precession.

Hence over the Plio - Pleistocene, East African climate is best characterised as a long - term trend towards increasing aridity punctuated by periods of precession - forced high rainfall leading to the periodic appearance of deep freshwater lakes.

CO2 provides only a minor effect in the obliquity and precession timescale band, but over 30 % of the forcing in the 100 kyr band, so it is a key forcing agent that allows us to explain the magnitude of glacial - interglacial temperature variations.

I saw of graph of the precession cycle once and it appeared to occasionally skip a beat — perhaps when eccentricity got near zero — this makes some intuitive sense at least... (cause of Obliquity cycle is less obvious than precession of axis; perhaps some contribution comes from the Earth - Moon orbit and Earth + Moon — Sun orbit not being in the same plane — although the Moon's orbit will «average» near the plane of the Earth - Sun orbit over a relatively short time, but there's lunar orbit eccentricity, etc,... residuals might build up...?

We can see these peaks in the Fourier periodogram of the earth's precession factor (we'll define that precisely in the next installment) over the last 5 million years:

Be that as it may the planet is going over the hump in axial precession moving towards the favorable stage for glacial advance.

The ends of Ice Ages appear to correspond to periods of the 25k year precession cycle when the sun is closer in the northern summer, which tends to remove the glaciers over time.

Page 2 of 23 Duncan Steel: Perihelion precession, polar ice and global warming Introduction Record melting of Arctic sea ice over the past year (Schiermeier 2012) has been widely presumed to be a consequence of anthropogenic global warming (AGW), and yet a natural mechanism exists that may be responsible, at least in part.

Here it is shown that the precession of perihelion occurring over a century substantially affects the intra-annual variation of solar radiation influx at different locations, especially higher latitudes, with northern and southern hemispheres being subject to contrasting insolation changes.

The small changes in insolation will cause earlier and more extensive spring melting of Arctic ice, and indeed less ice formation over winter because northern winters are now shorter and milder than they were in 1750, due to apsidal precession.

While you are over at my blog you might check the calculations which claim to find the 40 ″ / century precession in Mercury's orbit that le Verier missed, in the barycentric motion of the Sun too.

Precession refers to the fact that both Earth's rotational axis and orbital path precess (rotate) over time — the combined effects of these two components and the eccentricity produce an approximately 21,000 - year cycle.

The synodic period of Jupiter and Saturn does not vary with planet precession although their perihelion positions will vary over time producing a minor change.

Planetary gravity forces from the outer 4 planets over 100,000 years gradually change the shape of Earth's orbit from circular, to elliptical along with shorter term changes in the inclination angle and winter precession timing.

Precession: In a cycle of a little over 20,000 years, the point of the Earth's axis wobbles so that the north axis points now to Polaris (the North Star) but will eventually point to Vega before returning to Polaris.

Given that current low orbital eccentricity will persist over the next tens of thousand years, the effects of precession are minimised, and extremely cold northern summer orbital configurations like that of the last glacial initiation at 116 ka will not take place for at least 30 kyr (Box 6.1).