Mirror Mode Waves Detected by Polar in Low Field Regions Near Midnight

Physics

Scientific paper

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2744 Magnetotail, 2764 Plasma Sheet, 2772 Plasma Waves And Instabilities

Scientific paper

The present study examines the magnetic field at the apogee of the Polar spacecraft when its apogee was close to the equatorial plane and within 2 hours in local time of midnight. In this region the magnetic field magnitude is rarely below 5 nT. However, when it is this low, it can become unstable to mirror mode oscillations which then reduce the field strength even lower locally to less than 2 nT. One interval of mirror mode waves caused the minimum total field to approach 1 nT. We survey their occurrence rate and the conditions that lead to their appearance.

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