Assimilation of COSMIC Data into the USU GAIM Model L' Scherliess, D'C' Thompson, R'W' Schunk, and J - PowerPoint PPT Presentation

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Assimilation of COSMIC Data into the USU GAIM Model L' Scherliess, D'C' Thompson, R'W' Schunk, and J

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Logan, Utah 84322. Presented at: COSMIC Meeting. October 17, 2006. GAIM Basic Approach. We use a physics-based ionosphere-plasmasphere-polar wind model and a Kalman ... – PowerPoint PPT presentation

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Title: Assimilation of COSMIC Data into the USU GAIM Model L' Scherliess, D'C' Thompson, R'W' Schunk, and J


1
Assimilation of COSMIC Data into the USU GAIM
Model L. Scherliess, D.C. Thompson, R.W.
Schunk, and J.J. Sojka, Center for
Atmospheric Space SciencesUtah State
UniversityLogan, Utah 84322Presented
atCOSMIC MeetingOctober 17, 2006
2
GAIM Basic Approach
We use a physics-based ionosphere-plasmasphere-pol
ar wind model and a Kalman Filter as a basis for
assimilating a diverse set of real-time (or near
real-time) measurements. GAIM provides both
specifications and forecasts on a global,
regional, or local grid.
Global
Regional
Local
3
(No Transcript)
4
GAIM Assimilates Multiple Data Sources
  • Data Assimilated Exactly as They Are Measured
  • Bottomside Ne Profiles from Digisondes (20)
  • Slant TEC from up to 1000 Ground GPS Receivers
  • Ne Along Satellite Tracks (4 DMSP satellites)
  • Integrated UV Emissions
  • Occultation Data (CHAMP, SAC-C, IOX, COSMIC)

5
Ionosphere Data Assimilation Modelsat USU
  • Gauss-Markov Kalman Filter Model of the
    Ionosphere
  • Full Physics Kalman Filter Model of the
    Ionosphere

6
Gauss-Markov Kalman Filter Model
  • Specification of the Global Ionosphere
  • Kalman Filter solves for Deviations from
    Background

Operational Version Delivered July 15,
2004. NRL AFWA Northrop Grumman AFRL CCMC
BEI NOAA
7
Full Physics Kalman Filter Model
  • Ionosphere Specification
  • with
  • Middle Low Latitude Drivers

8
Global Ionosphere-Plasmasphere-Polar Wind Model
  • 3-D Time-Dependent Parameters
  • NO, O2, N2, O, H, He
  • Te, Ti
  • u, u?
  • Auxiliary Parameters
  • NmF2
  • hmF2
  • NmE
  • hmE
  • TEC
  • Grid System
  • Global
  • Regional
  • Localized
  • 90-30,000 km
  • Realistic Magnetic Field (IGRF)
  • Spatial Resolution Along B
  • 0.9 km in E-Region
  • 1.3 km in F-Region
  • 3.8 km in Topside
  • 240 km at 17,000 km

9
Determination of Ionospheric Drivers in GAIM
  • Ionospheric Drivers are determined in GAIM via
    an
  • Ensemble Kalman Filter
  • Augmentation of State Vector
  • Drivers include
  • Neutral Wind
  • Electric Fields
  • Composition

10
Global Kalman Filter
  • March 21-23, 2002
  • Data from four different Data Types
  • Slant TEC from Network of 167 GPS Receivers
  • Occultation Data from three satellites
  • (IOX, SAC-C, CHAMP)
  • Bottomside Ne from 6 Globally Distributed DISS
    Sounders
  • In situ Ne from 2 DMSP Satellites (F13, F15)
  • Kalman Filter Region
  • all Longitudes
  • 60o S - 60oN magn. Latitude

11
Data Distribution
080/2002/0030UT
12
IOX
SAC-C
CHAMP
Sample orbits tracks and occultation locations
13
Anderson et al. 2003
14
Preliminary Comparison of GAIM Ionospheric Specifi
cations with COSMIC Radio Occultation Data
15
Comparison of USU GAIM with COSMIC podTec Data
Comparison of USU GAIM Gauss-Markov Model with 10
Days of COSMIC absolute TEC (podTec) from 08/13,
2006 (Doy 225) to 08/22, 2006 (Doy 234).
  • Period was initially geomagnetically quiet.
  • Geomagnetic Storm occurred on Day 231.
  • Solar F10.7cm Flux was approximately 80.

16
Ionospheric Data Assimilated into GAIM
  • Slant TEC from a Network of more than 350
    Ground-Based
  • GPS Receivers
  • Bottomside Electron Density Profiles from 12
    DISS Stations
  • Good Data Coverage over North America

Triangle Ionosonde Station Colored Dot TEC
from GPS Ground Rx Stations shown at 300 km
Pierce Point.
17
COSMIC 2 GAIM
GAIM
COSMIC 2 IFM (Climate)
Climate
18
COSMIC 2 GAIM
pnr 20
GAIM
COSMIC 2 IFM (Climate)
pnr 20
Climate
19
COSMIC 2 GAIM
pnr 11
GAIM
COSMIC 2 IFM (Climate)
pnr 11
Climate
20
COSMIC 2 GAIM
pnr 21
GAIM
COSMIC 2 IFM (Climate)
pnr 21
Climate
21
COSMIC 2 GAIM
pnr 01
GAIM
COSMIC 2 IFM (Climate)
pnr 01
Climate
22
COSMIC 2 GAIM
pnr 07
GAIM
COSMIC 2 IFM (Climate)
pnr 07
Climate
23
COSMIC 2 GAIM
pnr 08
GAIM
COSMIC 2 IFM (Climate)
pnr 08
Climate
24
COSMIC 2 GAIM
pnr 16
GAIM
COSMIC 2 IFM (Climate)
pnr 16
Climate
25
COSMIC 2 GAIM
pnr 27
GAIM
COSMIC 2 IFM (Climate)
pnr 27
Climate
26
Comparison of Radio Occultation Data During Quiet
and Disturbed Conditions
Enhanced geomagnetic activity started on August
20, 2006
27
Comparisons during quiet and disturbed Conditions
COSMIC 2 GAIM
Quiet
COSMIC 2 GAIM
Storm
28
Comparisons during quiet and disturbed Conditions
COSMIC 2 GAIM
pnr 01
Quiet
COSMIC 2 GAIM
pnr 01
Storm
29
Comparisons during quiet and disturbed Conditions
COSMIC 2 GAIM
pnr 07
Quiet
COSMIC 2 GAIM
pnr 07
Storm
30
Comparisons during quiet and disturbed Conditions
COSMIC 2 GAIM
pnr 11
Quiet
COSMIC 2 GAIM
pnr 11
Storm
31
Comparisons during quiet and disturbed Conditions
COSMIC 2 GAIM
pnr 16
Quiet
COSMIC 2 GAIM
pnr 16
Storm
32
The Next Step
  • We have in the past assimilated GPS radio
    occultation data from
  • IOX, SAC-C and CHAMP and nighttime 1356Å UV
    Radiances
  • from LORAAS.
  • We plan to assimilate the COSMIC Data from
  • GPS Radio Occultation Receivers
  • Tiny Ionospheric Photometer (TIP)
  • Tri Band Beacon (TBB)
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