w0mvv
New Member
Posts: 1
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Post by w0mvv on Sept 5, 2011 15:53:45 GMT
Can anyone explain what the Phi plot is? What is it a measurement of, what it's normal range is and what an out of range reading indicates or predicts? I haven't been able to find any information on it--which is kind of weird.
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Post by Kevin VE3EN on Sept 5, 2011 16:20:04 GMT
Phi = Polar Angle
Interplanetary magnetic field polar angle
The angle between the IMF and the geomagnetic axis. When the IMF is southward, antiparallel fields near the magnetospheric subsolar point allow merging between the IMF and geomagnetic fields. This process increases the transport of solar wind mass, momentum, and energy into the Earth's magnetosphere. This process can also open the magnetosphere to solar energetic particle radiation. In severe conditions this radiation can threaten high altitude aircraft in high latitude and polar regions. Under less severe conditions this radiation can still threaten polar orbiting spacecraft. This quantity depends on IMF components measured by ACE/MAG. (Derived)
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Post by lsvalgaard on Sept 5, 2011 17:30:00 GMT
Phi = Polar Angle Interplanetary magnetic field polar angle The angle between the IMF and the geomagnetic axis. When the IMF is southward, antiparallel fields near the magnetospheric subsolar point allow merging between the IMF and geomagnetic fields. This process increases the transport of solar wind mass, momentum, and energy into the Earth's magnetosphere. This process can also open the magnetosphere to solar energetic particle radiation. In severe conditions this radiation can threaten high altitude aircraft in high latitude and polar regions. Under less severe conditions this radiation can still threaten polar orbiting spacecraft. This quantity depends on IMF components measured by ACE/MAG. (Derived) That is the theta angle. The Phi angle is the angle between the direction to the sun and the magnetic field line in the solar wind. wattsupwiththat.com/2010/03/08/nsidc-reports-that-antarctica-is-cooling-and-sea-ice-is-increasing/ |
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Post by Kevin VE3EN on Sept 5, 2011 17:47:37 GMT
Even I learn something new. Thanks for the correction.
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