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HENA One of a series of images acquired with the High Energy Neutral Atom (HENA) imager during the large magnetic storm of July 15-16, 2000. The open circle near the center represents the Earth. The pairs of extended loops indicate magnetic field lines at dawn, local noon (S), dusk, and midnight (A). The HENA images show the increase in energetic neutral atom fluxes that result from energetic particle injection and the build up of the ring current during periods of increased magnetospheric activity. In the false-color scheme used here, red indicates the highest ENA fluxes, blue the lowest. A six-panel figure tracking the evolution of the July 15-16 storm as seen with the HENA instrument can be viewed by clicking on the picture to the left. (Credit: D. G. Mitchell and HENA team, the Johns Hopkins University Applied Physics Laboratory) Movie of the HENA observations of the May 24 magnetic storm

MENA Image from the Medium Energy Neutral Atom (MENA) imager showing the injection of energetic particles during a magnetospheric substorm on June 10, 2000. Substorms are magnetospheric disturbances during which magnetic flux that has built up in the magentotail is explosively released through a reconfiguration of the magnetic field. Such events occur on average six times a day and more often during solar maximum. (Credit: C. J. Pollock and J.-M. Jahn, Southwest Research Institute)

LENA A coronal mass ejection that occurred on June 6 arrived at Earth two days later, triggering a moderate geomagnetic storm. The Low Energy Neutral Atom (LENA) imager observed low-energy neutral atoms associated with the CME as well as those induced by polar ion outflow. (Credit: T. E. Moore and the LENA team, NASA Goddard Space Flight Center)

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