Accession Number:

ADA488308

Title:

Study of Equatorial Ionospheric Irregularities with ROCSAT-1/IPEI Data for Assessment of Impacts on Communication/Navigation System (IV)

Descriptive Note:

Final rept. 18 Sep 2007-17 Sep 2008

Corporate Author:

NATIONAL CENTRAL UNIV CHUNG-LI (TAIWAN) INST OF SPACE SCIENCE

Personal Author(s):

Report Date:

2008-09-01

Pagination or Media Count:

24.0

Abstract:

1 Study the Cause of SeasonalLongitudinalsl Variations of Equatorial Irregularity Occurrences The examination of global monthly occurrence pattern of density irregularities indicates that a smooth and slow variation in the occurrence pattern exists from one longitude sector to the next. Such variation should be related to the smooth and slow variations of the magnetic declination as well as the longitudinal variation of the geographic location of the dip equator for the ionospheric property. The effects of the magnetic declination and the ionospheric condition initially affect the sl distribution of the post-sunset vertical drift velocities that then result in the same sl variations of the irregularity occurrences. Thus, other factors such as the seed distribution for the instability perturbation from the atmospheric disturbance probably play no role in determining the sl variations of irregularity occurrences. 2 Initial Result of SeasonalLongitudinal sl Distribution of Irregularity Spectra Indices There is some argument of identifying the outer-scale length of the irregularity turbulence correctly to obtain the turbulence strength parameter Cs. However, this will be cleared in the upcoming project when a coincident event between the ROCSAT and scintillation experiment at Ascension Island is studied in the later part of 2008. 3 Management of NCU-SCINDA Station and Study the Coincident Observation Events with FORMOSAT-3COSMIC and CNOFS The NCU-SCINDA Station is being managed smoothly with continuous operation up to now. All the full-wave mode 100 Hz data during the nighttime have been collected so far.

Subject Categories:

  • Navigation and Guidance
  • Unmanned Spacecraft

Distribution Statement:

APPROVED FOR PUBLIC RELEASE