Possible relationship between the Earth's rotation variations and geomagnetic field reversals over the past 510 Myr

Correlated variations and periodicity of global CO2, biological mass extinctions and extra-terrestrial bolide impacts over the past 250 million years and possible geodynamical implications

Earth's history has been witness to recurrently alternating phases of catastrophic evolution and dominant tectonic deformations, contractions and extension of rifting and spreading leading to quasi-cyclic changes in sedimentary environment and various earth processes. Recent studies have shown quasi-periodicities of 32 2 Million years (Myr) in various endogenic (geomagnetic reversals, magmatic ...

Bats Respond to Very Weak Magnetic Fields

How animals, including mammals, can respond to and utilize the direction and intensity of the Earth's magnetic field for orientation and navigation is contentious. In this study, we experimentally tested whether the Chinese Noctule, Nyctalus plancyi (Vespertilionidae) can sense magnetic field strengths that were even lower than those of the present-day geomagnetic field. Such field strengths oc...

On Variations of the Geomagnetic Field, Fluid Motions, and the Rate of the Earth's Rotation.

Regionally Recurrent Paleomagnetic Transitional Fields and Mantle Processes

Whether Earth's lower mantle observably influences the geodynamo as it attempts to reverse polarity has been hotly debated for more than a decade. Although several paleomagnetic records of transitional events support this contention, analyses of worldwide Cenozoic reversal data, when considered en masse, appear inconclusive. With this controversy in mind we present transitional field data assoc...

Evidence of nearby supernovae affecting life on Earth

Observations of open star clusters in the solar neighborhood are used to calculate local supernova (SN) rates for the past 510 million years (Myr). Peaks in the SN rates match passages of the Sun through periods of locally increased cluster formation which could be caused by spiral arms of the Galaxy. A statistical analysis indicates that the Solar System has experienced many large short-term i...