The team put monarchs in a flight simulator surrounded by a magnetic coil, measuring responses to horizontal, vertical, and
intensity changes in the magnetic field.
Not exact matches
The geological record also doesn't show much evidence for major
changes in the
intensity of the ancient
magnetic field over the past 4 billion years.
Another hypothesis for why the glacial periods terminate and restart is GCR modulation by
changes in the
intensity of the earth's
magnetic field.
The records document that the Laschamp Excursion was characterized locally by (1) declination
changes of ± 120 °, (2) inclination
changes of more than 140 °, (3) ~ 1200 - year oscillations
in both inclination and declination, (4) near 90 ° out - of - phase relationships between inclinations and declinations that produced two clockwise loops
in directions and virtual geomagnetic poles (VGPs) followed by a counterclockwise loop, (5) excursional VGPs during both intervals of clockwise looping, (6)
magnetic field intensities less than 10 % of normal that persisted for almost 2000 years, (7) marked similarity
in excursional directions over ~ 5000 km spatial scale length, and (8) secular variation rates comparable to historic
field behavior but persisting
in sign for hundreds of years.
We demonstrate, for the first time (a)
magnetic sensitivity
in dogs, (b) a measurable, predictable behavioral reaction upon natural
magnetic field (MF) fluctuation
in a mammal, and (c) high sensitivity to small
changes in polarity, rather than
in intensity, of the MF.
Sunspots are not the cause but a manifestation of
changes in the Sun's
magnetic field that
in turn modulates the
intensity of cosmic rays reaching the Earth.
So, if these currents have mass, and these currents are looping through a periodically
changing barycenter, all that is needed to affect something else
in the sun — and whether that symptom of the
change is a
change in sunspot number, or sunspot cycle
intensity, or
change in the sun's net
magnetic field, or corona «height», or ejected masses, or whatever is a small
change in the position of the barycenter.
The records document that the Laschamp Excursion was characterized locally by (1) declination
changes of ± 120 °, (2) inclination
changes of more than 140 °, (3) ~ 1200 - year oscillations
in both inclination and declination, (4) near 90 ° out - of - phase relationships between inclinations and declinations that produced two clockwise loops
in directions and virtual geomagnetic poles (VGPs) followed by a counterclockwise loop, (5) excursional VGPs during both intervals of clockwise looping, (6)
magnetic field intensities less than 10 % of normal that persisted for almost 2000 years, (7) marked similarity
in excursional directions over ~ 5000 km spatial scale length, and (8) secular variation rates comparable to historic
field behavior but persisting
in sign for hundreds of years.
GCRs are modulated by both solar
magnetic field, which is largely unpredictable
in strength except for generalities associated with 11 - year sunspot cycle and is also modulated by unpredictable events like nearby supernovas, and by more predictable very very long slow
changes in intensity due to the solar system traversing spiral arms of our galaxy and wandering above and below the galactic plane
in cycles lasting tens and hundreds of millions of years.