Accession Number : AD0864893

Title :   Ionospheric Morphology - Phase II.

Descriptive Note : Final technical rept. 15 Sep 68-15 Sep 69,

Corporate Author : AVCO GOVERNMENT PRODUCTS GROUP LOWELL MA AVCO APPLIED TECHNOLOGY DIV

Personal Author(s) : Penndorf, R. ; Katz, A. H.

Report Date : DEC 1969

Pagination or Media Count : 381

Abstract : Phase II of an ionospheric morphology study provides further material leading to an improvement of HF prediction techniques. To simulate ionospheric conditions a numerical solution of the continuity equation for dN/dt=0 is obtained which gives reliable electron density cross-section between the equator and 60 degrees geomagnetic latitude. The variation of electron density during 7 disturbed time periods is investigated along the 75 degrees W. At night the peak of the F2 layer is higher by 50 to 100 km during the disturbed periods in comparison to quiet periods, but during the day it is more in the 25 to 50 km range or sometimes even smaller. The maximum electron density variations undergo seasonal and diurnal changes. Ray tracing through disturbed ionosphere shows the importance of changes in height and electron density on range and take-off angle. Changes in electron density during sunrise periods are regular on quiet days, but difficult to generalize for disturbed conditions. (Author)

Descriptors :   (*RADIO WAVES, IONOSPHERIC PROPAGATION), (*IONOSPHERIC DISTURBANCES, ELECTRON DENSITY), MATHEMATICAL PREDICTION, HIGH FREQUENCY, SUNSPOTS, MAGNETIC STORMS.

Subject Categories : Atmospheric Physics
      Radiofrequency Wave Propagation

Distribution Statement : APPROVED FOR PUBLIC RELEASE