Title: 06 PowerPoint Briefing style
1Formosat-3 COSMIC Campaign Observations at
Kwajalein Atoll October 18, 2006
Chin S. Lin Space Vehicles Directorate Air Force
Research Laboratory
2Outline
- Introduction
- Formosat-3 COSMIC Campaign Study
- Kwajalein Campaign
- SCINDA Ground Network
- Conjunction Observations of Scintillations
- Conclusion
- Kwajalein Campaign Study Participants
- AFRL/SCINDA Keith Groves, Isseyas Mengistu, Chin
Lin, Michael Starks, David Hatcher, Santimay Basu - KRS/ALTAIR Dale Sponseller
- NSPO Tie-yue Liu, Cheng-Yung Huang
- UCAR Stig Syndergaad
- NCU Yen-Shyang Chu
3Formosat-3 COSMIC Campaign Study
- Campaign planning meeting at Baltimore, MD on May
24, 2006 - Campaign Study Meeting Participants
- COSMIC (Rocken, Syndergaard)
- TIP (S. Basu, Dymond, Coker, Sa. Basu, Budzien)
- TBB Ground receivers (Bernhardt)
- Jicamarca ISR (Hysell)
- Arecibo ISR (Kelley)
- ALTAIR ISR (Groves, Lin)
- SCINDA Network (Groves)
- South America GPS stations (Abdu)
- Pacific Ground Network (Chu, Su)
- Modeling Analysis
- C/NOFS (de la Beaujardiere)
- GAIM (Mannucci)
- RO (Straus)
4Kwajalein Campaign Study
- Objective To study radio occultation and
scintillations of GPS signals passing through
equatorial density bubbles - Campaign study periods
- September 10 22, 2006
- Ground Observations
- ALTAIR ISR
- SCINDA Network (UHF and GOS scintillation
monitors) - All sky imager
- Digisonde
5ALTAIR Radio Occultation Scanning Experiment
Problem Variation of electron density along
radio occultation path has unknown effects on
excess phases Abel inversion of electron density
profiles assumes a spherical symmetry in
ionospheric density. Horizontal density gradient
effects unclear.
Proposed Solution Investigate electron density
variation along radio occultation path using
VHF/UF ALTAIR radar at Kwajalein
6ALTAIR VHF Radar Scan Quick Look Plot
Time
Range
7ALTAIR Radar Wide Band Scintillation Echo
Quick Look Plot
18 Mhz Frequency Bandwidth
8Radio Occultation Ray Paths Over ALTAIR
Radio occultation Perigee path
ALTAIR
9(No Transcript)
10Kwajalein Allsky Imager630 nm
11Kwajalein Imager Intensity Along
Formosat-3/COSMIC Track
12SCINTILLATION NETWORK DECISION AID(SCINDA)
A regional nowcasting system to support research
and users of space-based communication and
navigation systems
- Ground-based sensor network
- Passive VHF / L-band /GPS scintillation receivers
- Measures scintillation intensity, eastward drift
velocity, and TEC - Automated real-time data retrieval via internet
- Data supports research and space weather users
- Understand on-set, evolution and dynamics of
large-scale ionospheric disturbances - Empirical model provides simplified
visualizations of scintillation regions in
real-time
13SCINDA Ground Stations
Present and anticipated thru 2008
30N
0
30S
0
210E
240E
300E
330E
60E
90E
120E
150E
270E
30E
Future sites shown represent approximate desired
locations actual sites TBD
14SCINDA Ground Sensor Data at Kwajalein
15Scintillation Index at Kwajalein
16Formosat-3/COSMIC Observations of Scintillations
17Formosat-3/COSMIC Observations
18Ionospheric Electron Density Profile
Inversion from Formosat-3/COSMIC Radio
Occultation
19Kwajalein Digisonde
20Conclusions
- On-going study of scintillations using
conjunction observations from Formosat-3/COSMIC
observations, ALTAIR and SCINDA network of
monitors. - SCINDA data from a network of 15 stations around
the globe in conjunction with Formosat-3/COSMIC
observations are useful for studying the
characteristics and climatology of equatorial
scintillation. - Locations of ionospheric scintillations are to be
estimated by triangulation from Formosat-3
satellite and SCINDA ground station. - Electron density profiles deduced from
ionospheric radio occultation are to be used to
examine the relationship between the
scintillation altitude and the F layer peak - Electron density distributions from ALTAIR radar
scatter are to be used to study the impact of
density gradients on profile inversion techniques