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The Universe at Your Fingertips 2.0 DVD from the Astronomical Society of the Pacific is in our online store, filled with Earth and space science resources.
This image shows the magnetic field lines of a planet passing by a moon and creating a wake.
Click on image for full size
J. Linker

Wake

A moon which is inside a magnetosphere usually travels slower than the magnetic field. This means that the magnetic field lines will pass over the satellite like water going around a rock. Because the moon is made of conducting material, the magnetic field will be delayed in passing around the moon. Thus the field lines will be distorted in passing over the satellite. Eventually they straighten up. The region upstream of the satellite, in the magnetic field of the planet, is called a satellite wake.

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Windows to the Universe, a project of the National Earth Science Teachers Association, is sponsored in part is sponsored in part through grants from federal agencies (NASA and NOAA), and partnerships with affiliated organizations, including the American Geophysical Union, the Howard Hughes Medical Institute, the Earth System Information Partnership, the American Meteorological Society, the National Center for Science Education, and TERC. The American Geophysical Union and the American Geosciences Institute are Windows to the Universe Founding Partners. NESTA welcomes new Institutional Affiliates in support of our ongoing programs, as well as collaborations on new projects. Contact NESTA for more information. NASA ESIP NCSE HHMI AGU AGI AMS NOAA