Magnetic Polarity Transitions and Biospheric Effects

  title={Magnetic Polarity Transitions and Biospheric Effects},
  author={Karl‐Heinz Glassmeier and Joachim Vogt},
  journal={Space Science Reviews},
This review addresses possible biospheric effects of geomagnetic polarity transitions. During a transition the magnetic field at the surface of the Earth decreases to about 10% of its current value. If the geomagnetic field is a shield against energetic particles of solar or cosmic origin then biospheric effects can be expected. We review the early speculations on the problem and discuss in more detail its current status. We conclude that no clear picture of a geomagnetic link, a causal… 

Deciphering records of geomagnetic reversals

The fidelity of the signal extracted from paleomagnetic records is discussed in detail and special attention is paid to their resolution with respect to the timing and mechanisms involved in the magnetization process.

What happens when the geomagnetic field reverses

During geomagnetic field reversals the radiation belt high-energy proton populations become depleted. Their energy spectra become softer, with the trapped particles of highest energies being lost

Revisiting the Biological Ramifications of Variations in Earth’s Magnetic Field

  • M. Lingam
  • Physics, Geology
    The Astrophysical Journal
  • 2019
An Earth-like planetary magnetic field has been widely invoked as a requirement for habitability as it purportedly mitigates the fluxes of ionizing radiation reaching the surface and the escape of

How the Geomagnetic Field Influences Life on Earth - An Integrated Approach to Geomagnetobiology.

The GMF has a positive impact on living organisms, whereas a diminishing or disappearing GMF negatively affects living organisms.

The Earth’s Magnetic Field in the Space Age: An Introduction to Terrestrial Magnetism

The series of papers presented in this issue of Space Science Research (reprinted as Volume 36 in the Space Science Series of ISSI) is the result of a fruitful workshop that took place at the

Does the planetary dynamo go cycling on? Re-examining the evidence for cycles in magnetic reversal rate

Abstract The record of reversals of the geomagnetic field has played an integral role in the development of plate tectonic theory. Statistical analyses of the reversal record are aimed at detailing

Simulating the Solar Wind‐Magnetosphere Interaction During the Matuyama‐Brunhes Paleomagnetic Reversal

During a paleomagnetic reversal, Earth's geomagnetic field is about 10% of today's magnitude and its topology is far more complex than dipolar. Revealing the solar wind energy transmission during the

Magnetospheric Studies: A Requirement for Addressing Interdisciplinary Mysteries in the Ice Giant Systems

Uranus and Neptune are the least-explored planets in our Solar System. This paper summarizes mysteries about these incredibly intriguing planets and their environments spurred by our limited

Geomagnetic Field Model Indicates Shrinking Northern Auroral Oval

Polar cap and auroral oval areas are presented for the period 1900–2015 using a model of the magnetosphere and the International Geomagnetic Reference Field Version 12 (IGRF‐12) model for the



The Sun, geomagnetic polarity transitions, and possible biospheric effects: review and illustrating model

Abstract The Earth is embedded in the solar wind, this ever-streaming extremely tenuous ionized gas emanating from the Sun. It is the geomagnetic field which inhibits the solar wind plasma to


At certain times in the past, geomagnetic polarity reversals have caused fluctuations in the strength of the magnetospheric field. These in turn have modulated the cosmic ray flux impinging on the

Consequences of Very Small Planetary Magnetic Moments

PALAEOMAGNETIC samples show a number of polarity transitions in the Earth's dipole field, and there seem to have been marked evolutionary changes in flora and fauna near the time of several of the

Concerning long-term geomagnetic variations and space climatology

During geomagnetic polarity transitions the surface magnetic field of the Earth decays to about 25% and less of its present value. This implies a shrinking of the terrestrial magnetosphere and posses

MHD simulations of quadrupolar paleomagnetospheres

[1] During geomagnetic polarity transitions the Earth's internal magnetic field is expected to deviate significantly from the dipolar configuration observed today, and higher-order multipoles can

Relationship between biological extinctions and geomagnetic reversals

It has been repeatedly suggested that reversals of Earth9s magnetic field play a controlling role in evolution. Empirical evidence put forward to support this hypothesis has come from comparisons of

Energetic particles in the paleomagnetosphere: Reduced dipole configurations and quadrupolar contributions

[1] The Earth’s magnetosphere acts as a shield against highly energetic particles of cosmic and solar origin. On geological timescales, variations of the internal geomagnetic field can drastically

Evidence for an increase in cosmogenic 10Be during a geomagnetic reversal

Reversals in the geomagnetic field, which occur every few hundred thousand years, represent a dramatic change in the Earth's environment. Although there is no satisfactory theory for such reversals,