U Index

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U Index

</dt>
The value u = U / sin A cos B where U is the U-index; A is the magnetic colatitude; and B is the angle between the magnetic meridian and the horizontal component of the magnetic field intensity. </dd>
The annual and longer period mean values of the u-index exhibit one of the strongest solar and terrestrial activity relationships known. </dd>

References

This article is based on NASA's Dictionary of Technical Terms for Aerospace Use