Toward a solution to the early faint Sun paradox: A lower cosmic ray flux from a stronger solar wind

@article{Shaviv2003TowardAS,
  title={Toward a solution to the early faint Sun paradox: A lower cosmic ray flux from a stronger solar wind},
  author={N. J. Shaviv},
  journal={Journal of Geophysical Research},
  year={2003},
  volume={108},
  pages={1437}
}
  • N. Shaviv
  • Published 23 June 2003
  • Physics
  • Journal of Geophysical Research
[1] Standard solar models predict a solar luminosity that gradually increased by about 30% over the past 4.5 billion years. Under the faint Sun, Earth should have been frozen solid for most of its existence. Yet, running water is observed to have been present since very early in Earth's history. This enigma is known as the faint Sun paradox. We show here that it can be partially resolved once we consider the cooling effect that cosmic rays are suspected to have on the global climate and by… Expand

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References

SHOWING 1-10 OF 67 REFERENCES
The spiral structure of the Milky Way, cosmic rays, and ice age epochs on Earth
Abstract The short term variability of the galactic cosmic ray flux (CRF) reaching Earth has been previously associated with variations in the global low altitude cloud cover. This CRF variabilityExpand
Cosmic Rays, Clouds, and Climate
TLDR
Physical mechanisms have been proposed to explain how cosmic rays could affect clouds, but they need to be investigated further if the observed correlation between cosmic ray intensity and Earth's average cloud cover is to become more than just another correlation among geophysical variables. Expand
Early solar mass loss: A potential solution to the weak sun paradox
The weak sun paradox, in which early planetary temperatures are known to have remained above the freezing point of water despite presumably lower early solar luminosity, has customarily been resolvedExpand
Apparent tropospheric response to MeV‐GeV particle flux variations: A connection via electrofreezing of supercooled water in high‐level clouds?
The ionization production by MeV-GeV particles (mostly galactic cosmic rays) in the lower atmosphere has-well defined variations on a day-to-day time scale related to solar activity, and on theExpand
Influence of variations of the cosmic rays on atmospheric pressure and temperature in the Southern geomagnetic pole region
Abstract Daily data of pressure, temperature, and wind observations at Antarctic station Vostok in 1981–1991 have been analyzed with regard to the cosmic-rays variations. Case study and statisticalExpand
Measured Mass‐Loss Rates of Solar‐like Stars as a Function of Age and Activity
Collisions between the winds of solar-like stars and the local interstellar medium result in a population of hot hydrogen gas surrounding these stars. Absorption from this hot H i can be detected inExpand
Earth's early atmosphere
TLDR
A better understanding of past atmospheric evolution is important to understanding the evolution of life and to predicting whether Earth-like planets might exist elsewhere in the galaxy. Expand
Cosmic ray diffusion from the galactic spiral arms, iron meteorites, and a possible climatic connection.
  • N. Shaviv
  • Physics, Medicine
  • Physical review letters
  • 2002
TLDR
Although the geological evidence for the occurrence of iceage epochs in the past eon is not unequivocal, it appears to have a nontrivial correlation with the spiral arm crossings-agreeing in period and phase. Expand
The Magellanic Clouds: their evolution, structure and composition
SummaryThe Magellanic Clouds play a fundamental role in a number of fields of astronomical research. Their distances are most relevant to the extragalactic distance scale. Their relative proximityExpand
Chemical enrichment and star formation in the Milky Way disk. II. Star formation history
A chromospheric age distribution of 552 late-type dwarfs is transformed into a star formation history by the ap- plication of scale height corrections, stellar evolutionary cor- rections and volumeExpand
...
1
2
3
4
5
...