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GEM Storm Intervals |
Other Storm Intervals |
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March 1998 - no data |
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September 1998 - no data |
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October 1998 - no data |
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The plot shows two panels that summarize the all-sky data taken on the day of the main storm activity. Each plot is a keogram that covers covers 1 day of data. Keograms are time sequences of poleward-equatorward slices through an all-sky image.
The top panel shows the keogram for the 630 nm emission from atomic oxygen. It is mostly related to low energy electron precipitation and is created in the altitude region 150-300 km. The left scale shows the geomagnetic latitude of the emission. South Pole station is located at -74 degrees geomagnetic latitude and the all-sky imager covers a region from -67 to -83 degrees geomagnetic latitude. Bright stripes are an indication of auroral activity over almost the complete field of view.
The lower panel shows the keogram for the 427.8 nm emission from ionized molecular nitrogen (First negative band). It is mostly related to higher energy electron precipitation (greater than 3 keV) and is created in the altitude region 90-130 km. The left scale shows the geomagnetic latitude of the emission which covers a region from -69 to -81 degrees geomagnetic latitude. Bright regions moving from the bottom to top or vice versa are an indication of an auroral arc moving poleward or equatorward, respectively.
The panels show only the overview for the day of highest storm activity, but other days before or after the main as well as individual all-sky images at certain times can be prepared on request.
Harald Frey
Space Sciences Laboratory
University of California
510-643-3323, phone
510-643-2624, fax
hfrey@ssl.berkeley.edu