External forcing of the geomagnetic field? Implications for the cosmic ray flux—climate variability

Wendler, Ines

doi:10.1016/j.jastp.2004.05.003

Cited by 19 publications

(13 citation statements)

References 74 publications

(118 reference statements)

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“…Similar magnetic features characterized our planet during the Kiama Hyperchron (R81, 313-267 Ma) and Khadar Hyperchron (R98, 484-462 Ma), corresponding to the evolutionary turns that occurred during the Carboniferous-Permian galactic winter at the perycenter (perygalacticon) and the Ordovician galactic summer at the apocenter (apogalacticon) (see Fig. 2; Molostovskii et al, 2007;Wendler, 2004; and references therein).…”

Section: Phanerozoic and Late Proterozoicsupporting

confidence: 66%

“…1. A scheme illustrating the suggested temporary positions of the Sun and Earth relative to the galactic center (after Nechaev, 2004) and comet impacts (for example, Shaviv and Veizer, 2003;Wendler, 2004;Barenbaum, 2012Barenbaum, , 2013; and references therein).…”

Section: Approaches and Data Sourcesmentioning

confidence: 99%

“…The Cretaceous evolutionary turn was reflected by a specific geomagnetic field (Granot et al, 2012;Molostovskii et al, 2007;Wendler, 2004), including a long period when reversals were sparse or too frequent for detection (Jalal Hyperchron,N88,. This period was also characterized by maxima of chaotic magnetic disturbances, suggesting enhanced turbulence in Earth's liquid core (Kurazhkovskii et al, 2015).…”

Section: Phanerozoic and Late Proterozoicmentioning

confidence: 99%

“…According to this model, the Earth became colder and suffered from severe geological crises when passing the spiral arms that generate intensive cosmic rays. Following and developing this hypothesis, Wendler (2004) suggested that significant turbulent magnetic influences of the spiral arms resulted in reversing geomagnetic fields, while the geomagnetic regime with sparse reversals (superchrons) occurred while the Solar System was positioned in the space between the spiral arms. However, this seems to conflict with a more recent study showing that enhanced turbulence in Earth's liquid core produced the geomagnetic regime with sparse reversals, one of which took place during the warm Cretaceous time (Kurazhkovskii et al, 2015).…”

mentioning

confidence: 99%

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The Cretaceous Turn of Geological Evolution: Key Evidence from East Asia

Nechaev

Dai

Sutherland

et al. 2018

Acta Geologica Sinica (Eng)

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this work focuses on one of the critical points of Earth's history when the Solar System passed through the most distant point of its galactic orbit. During this event, Earth may have suffered from maximum extension, associated with its relative proximity to the Sun at that time, followed by long‐term contraction related to its later distancing. This paper is based on generalized data on the Cretaceous evolution of the Earth as a whole and of East Asia in particular. The evidence suggests that major geological processes at this time may be interpreted as transitional changes in the state of Earth. A liquid nature of its core may have reacted to the gravitational and electromagnetic transformations. When the cosmic changes took place at 135–120 Ma, more turbulent flows in the outer core would have favoured the rise of voluminous magmatic plumes and associated fluid flows. These would substantially transform the mantle, crust, hydrosphere, biosphere and atmosphere. In particular, plume‐related melting of overlying subducting slabs and lower continental crust could have initiated numerous adakitic melts that formed the East Asian Adakitic Province. These and associated juvenile events produced numerous metallic ore, coal, gas and oil deposits. The Cretaceous is one of the most significant resource‐producing periods.

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Section: Phanerozoic and Late Proterozoicsupporting

confidence: 66%

Section: Approaches and Data Sourcesmentioning

confidence: 99%

Section: Phanerozoic and Late Proterozoicmentioning

confidence: 99%

mentioning

confidence: 99%

See 2 more Smart Citations

The Cretaceous Turn of Geological Evolution: Key Evidence from East Asia

Nechaev

Dai

Sutherland

et al. 2018

Acta Geologica Sinica (Eng)

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“…Taking the weighted mean of 228 km s −1 for the Solar System (LSR, Table 1, Vallée, 2017 b ) and values between 200 and 160 km s −1 for the spiral pattern (Table 2, Vallée, 2017 b ) gives a range of galactic periods from 1750 to 720 Myr. This can be constrained further by considering superchrons as markers of inter-arm passage (Wendler, 2004). In particular, we assume that the superchrons end at a fixed distance (and therefore time) before the arms.…”

Section: Methodsmentioning

confidence: 99%

Mapping the location of terrestrial impacts and extinctions onto the spiral arm structure of the Milky Way

Gillman

Erenler

Sutton

2018

International Journal of Astrobiology

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High-density regions within the spiral arms are expected to have profound effects on passing stars. Understanding of the potential effects on the Earth and our Solar System is dependent on a robust model of arm passage dynamics. Using a novel combination of data, we derive a model of the timings of the Solar System through the spiral arms and the relationship to arm tracers such as methanol masers. This reveals that asteroid/comet impacts are significantly clustered near the spiral arms and within specific locations of an average arm structure. The end-Permian and end-Cretaceous extinctions emerge as being located within a small star-formation region in two different arms. The start of the Solar System, greater than 4.5 Ga, occurs in the same region in a third arm. The model complements geo-chemical data in determining the relative importance of extra-Solar events in the diversification and extinction of life on Earth.

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