Only 50 years ago, they could be seen perched on a tree or utility
pole near any field of sufficient size.
Not exact matches
As Titan lacks its own magnetic
field the same thing can occur over wider regions, not just
near the
poles.
But when the sun ejects major blasts of particles in flares and solar storms, these belts overflow and send electrons streaming toward Earth along the looping lines of the magnetic
field, which intersect the planet
near the north and south
poles.
Over the past decade, NASA has sent the Lunar Reconnaissance Orbiter to map the Moon; the Lunar Crater Observation and Sensing Satellite to crash land
near the south
pole in search of water; the Gravity Recovery and Interior Laboratory to plumb the Moon's gravity
field; and the Lunar Atmosphere and Dust Environment Explorer (LADEE) to study its tenuous outer atmosphere.
According to theory, these
fields can funnel part of the star's energy back onto the surface, creating hot spots
near the magnetic
poles.
The magnetic
field lines originate in the Earth's core and emerge
near the
poles, where their angle of dip — or inclination — relative to Earth's surface is almost 90 degrees.
«These rocks were deposited on the ocean floor 440 million years ago
near the south
pole, and its components were oriented in the direction of the Earth's magnetic
field at the time (N - S),» explains Javier Fernández Lozano, a geologist at the University of Salamanca and co-author of the research.
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.
Analysis of early galaxies in the Hubble deep
fields taken
near the north and south celestial
poles (in 1995 and 1998, respectively) suggest that the farthest objects in the deep
fields are only the «tip of the iceberg» of a uniquely effervescent period of star birth.
The instruments are designed to sample plasma waves and particles around Jupiter to determine how the magnetic
field is connected to the atmosphere around the auroras
near the northern and southern
poles.
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.