Formosat3/COSMIC Workshop, Taipei, Oct. 1-3, 2008 TEC EDP SCINTILLATION km and Plasmasphere IMPERFECT IONOSPHERIC CORRECTION ( km ) LOW QUALITY L2 OBSERVATONS (< 20 km ) Ionospheric Observations and Noise
Formosat3/COSMIC Workshop, Taipei, Oct. 1-3, 2008 The Ionosphere
as Signal and Noise in Radio Occultation Christian Rocken, Sergey
Sokolovskiy, Bill Schreiner, Doug Hunt, Stig Syndergard, Karl
Hudnut UCAR COSMIC Project Formosat3/COSMIC Workshop, Taipei, Oct.
1-3, 2008 Radio Occultation Ionosphere as signal Ionosphere is
noise Formosat3/COSMIC Workshop, Taipei, Oct. 1-3, 2008 TEC EDP
SCINTILLATION km and Plasmasphere IMPERFECT IONOSPHERIC CORRECTION
( km ) LOW QUALITY L2 OBSERVATONS (< 20 km ) Ionospheric
Observations and Noise Formosat3/COSMIC Workshop, Taipei, Oct. 1-3,
2008 COSMIC trans- ionospheric radio links for a 100-min period,
June 29, 2007 Amount of COSMIC-observed Trans Ionospheric TEC Data
Quality of abs. TEC ~2 TECU Formosat3/COSMIC Workshop, Taipei, Oct.
1-3, 2008 Current Latency of COSMIC TEC Data Location of
Low-Latency TEC Arcs Most data are downloaded from Satellites <
100 m Processing at CDAAC takes ~ 20 minutes Formosat3/COSMIC
Workshop, Taipei, Oct. 1-3, 2008 COSMIC - Ionosonde Comparison Jan.
2008, distance < 500 km, time difference < 15 min, colors
indicate ionosondes HMF2 rms=57 km F0F2 rms=0.60 MHz
Formosat3/COSMIC Workshop, Taipei, Oct. 1-3, 2008 Scintillation
Sensing with COSMIC No scintillation S4=0.005 Scintillation
S4=0.113 GPS/MET SNR data Formosat3/COSMIC Workshop, Taipei, Oct.
1-3, 2008 Global Scintillation Mapping with COSMIC S4 Index Maximum
between km Formosat3/COSMIC Workshop, Taipei, Oct. 1-3, 2008
Amplitude scintillations (S4 index based on 50-Hz observations)
E-Layer scintillation: Occurs at all local times except near
sun-rise (3-7 LT), strongest near sun- set (14-19 LT). Most active
between deg north and south latitude More pronounced in NH than SH
Stronger S4 than F-layer scintillation Formosat3/COSMIC Workshop,
Taipei, Oct. 1-3, 2008 F-Layer scintillation: Occurs sunset to
sunrise ( LT). Most active in equatorial region (+/- 30 degrees).
Weaker S4 than E-layer scintillation Amplitude scintillations (S4
index based on 50-Hz observations) Formosat3/COSMIC Workshop,
Taipei, Oct. 1-3, 2008 Ionospheric Calibration We estimate
systematic ionospheric error by computing the mean of the iono-free
bending angle minus neutral bending angle (from climatology) in the
km height bin. We compare this quantity smean for daytime vs.
nighttime soundings. COSMIC Days 0-120, < Lat. < 20 DAY
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