Sentences with phrase «periodic variations»

There is now very strong evidence that the root cause of these cycles lies in periodic variations in the earth's rotation axis and orbit around the sun.

These crystals are nanostructured materials in which periodic variations of the refractive index on the length scale of visible light produces a photonic «band gap».

A month later, follow - up observations with the Lovell radio telescope in Cheshire, UK, revealed periodic variations in the pulsar's signals, indicating the existence of an orbiting companion with the mass of a planet.

David Thomson, Carol Mclennan and Louis Lanzerotti of AT&T Bell Laboratories in Murray Hill, New Jersey, claim that the flow of particles in the solar wind shows periodic variations on timescales of a few minutes, which exactly match the periods of vibrations of the Sun's core (Nature, vol 376, p 139).

«The climate system accentuates very long periodic variations and dampens shorter term variations.»

El Niño - Southern Oscillation (ENSO) A periodic variation in wind and sea - surface temperature patterns that affects global weather; El Niño (warming phase where sea - surface temperatures in the eastern Pacific Ocean warm) generally means warmer (and sometimes slightly drier) winter conditions in Montana.

An attempt to find large planets from December 1986 to February 1987 failed to detect large periodic variations in radial velocities (McMillan and Smith, 1987; more discussion at Hatzes et al, 2004).

Uncertainties in the regression models and fits used to distinguish between periodic variations and trends in the different databases appear to be a significant source of uncertainty in the estimates of longterm trends.

Nilsson et al. (2011) discuss a potential 1350 yr cyclicity from the nearly periodic variation of dipole tilt they observe in the slightly updated model DEFNBKE.

While the Earth's atmosphere has seen higher levels of carbon dioxide than it does now, as well as higher temperatures and far greater sea levels, those instances were due to natural drivers of climate change, such as periodic variations in the planet's orbit and in solar energy output.

The researchers observed a periodic variation in the cell's lipid composition, similar to what they noticed in human subjects.

A periodic variation in the number of solar neutrinos detected on Earth may hold information about subtle changes in temperature at the very centre of the Sun.

Radial velocity observations from observing runs in 2000 and 2004 reveal a periodic variation of 3.30 ± 0.02 d, which is consistent with the previously determined value of 3.3125 ± 0.0002 d.

Pacific Decadal Oscillation (PDO) A periodic variation in sea - surface temperatures that is similar to El Niño - Southern Oscillation, but has a much longer duration (approximately 20 - 30 yr).

A periodic variation in wind and sea - surface temperature patterns that affects global weather; El Niño (warming phase where sea - surface temperatures in the eastern Pacific Ocean warm) generally means warmer (and sometimes slightly drier) winter conditions in Montana.