An Empirical Model of FUV Auroral Intensity

Abstract

P'JbIhc 'elonring burden for this co~fect on %o', formO $etmt a.,,;era~je I hour per reSpore. imCt In the time for reviewing instruc:tions, %oalrching existing dalta sources, gjathering arnd maintaining the data mee , and . Tel Aviv, 69978, ISRAEL SPONSORING / MONITORING AGENCY NAME(S) AND ADDRESS(ES) SPONSORING / MONITORING Phillips Laboratory AGENCY REPORT NUMBERHanscom AFB, MA 01731-5000 PL-TR-92-2133Contract Manager: Frank DelGreco/CPIM SUPPLEMENTARY NOTES 12a. DISTRIBUTION /AVAILABILITY STATEMENT 12b. DISTRIBUTION CODE ABSTRACT (Maximum 200 words)A statistical model of auroral intensity as a function of magnetic activity was created.The model was derived from several hundred 1356A images of the aurora borealis obtainedby Polar BEAR at solar minimum. Intensitie-were averaged in 35 divisions of CGL (from 55" to 90", each division 1" long), 48 divisions of MLT (each division half an hour wide), and 5 divisions of magnetic activity (Kp = 0-4). The peak oval intensity is located near midnight for all Kp values but 0. Two secondary maxima in the average 1356A intensity are found in the dayside part of the oval: one in the morning and one in the afternoon. coincide with the minimum average electron energy and maximum electron number flux associated with cusp precipitation. These emissions are located at the so-called "midday gap", which was termed as such by less sensitive imaging studies of the aurora. SUBJECT TERMS