UARC Campaign April 7-11, 1997

This campaign was run in real time with many data sources (IS radars, magnetometers, riometers, ground based imagers, satellites) available to participants in real time. For more information see the UARC or the ISTP campaign pages. The UVI image analysis requires too much effort to be run in real time and is an ongoing study. Data from UVI will be combined with the ground based data in AMIE to model the ionosphere and the thermosphere.

Our analysis concentrates on the period from 10 April evening to early 11 April. Raw images from UVI (one LBH-long image every 5 minutes) show the general morphology and development of the auroral activity. The last images (06:06-06:39, April 11) show stars moving through the field of view of the imager, during a section of the orbit where the instrument points away from the earth.

Summary plots of UVI raw images April 9

Apr 9, 5:09-7:12 UT	Apr 9, 7:15-9:19 UT	Apr 9, 9:22-11:25 UT

Apr 9, 11:28-13:28 UT	Apr 9, 13:31-15:46 UT	Apr 9, 15:49-17:59 UT	Apr 9, 22:30-23:56 UT

Summary plots of UVI raw images April 10

Apr 10, 20-22 UT	Apr 10, 22-24 UT

Summary plots of UVI raw images April 11

Apr 11, 00:02-03:16 UT	Apr 11, 03:16-06:39 UT

The hemispheric power calculated from UVI images using filter LBH-long from 05:00 to 17:00, April 9, 1997. The POLAR orbit prevents the imager from seeing the entire auroral oval at the beginning of this period, so the plotted hemispheric power is only a lower limit. The images from 10-14 UT are not yet processed, however, the activity level is low.

The hemispheric power calculated from UVI images using filter LBH-long from 20:00 to 24:00, April 10, 1997. The data are also available as ASCII (the format for each line is: date, time (UT hh:mm:ss), time (UT in decimal hours), power (GW), total area with pixels normalized to the total area above 50 degrees magnetic latitude, and in the last column is this area in m²).

There are processed sample images of the energy flux around the time of the peak of the activity on April 10 (9 plots combined to cover 22:23-22:48) and individual plots of the energy flux as *.gif images and compressed tar files (*.tgz). The tar files contain images to cover the periods that I have processed as indicated in the hemispheric power plots. The black portion of the plots indicate the part of the globe that is outside of the field of view of the UVI instrument.