Heliospheric Simulations of the SHINE Campaign Events SHINE Workshop, Big Sky, MT, June 27 – July 2, 2004 Dusan Odstrcil 1,2 1 University of Colorado/CIRES,

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Presentation transcript:

Heliospheric Simulations of the SHINE Campaign Events SHINE Workshop, Big Sky, MT, June 27 – July 2, 2004 Dusan Odstrcil 1,2 1 University of Colorado/CIRES, 2 NOAA/Space Environment Center

Collaborators  Nick Arge – AFRL, Hanscom, MA  Chris Hood – University of Colorado, Boulder, CO  Jon Linker – SAIC, San Diego, CA  Rob Markel – University of Colorado, Boulder, CO  Leslie Mayer – University of Colorado, Boulder, CO  Vic Pizzo – NOAA/SEC, Boulder, CO  Pete Riley – SAIC, San Diego, CA  Marek Vandas – Astronomical Institute, Prague, Czech Republic  Xuepu Zhao – Stanford University, Stanford, CA Supported by AFOSR/MURI and NSF/CISM projects

Outline (A) Numerical Modeling (B) 21 April 2002 and 24 August 2002 Event (C) 12 May 1997 Event

A. Numerical Modeling

Observations – 1997 May 12 Event Photospheric magnetic field Coronal density at limbs Halo-CME Parameters at Earth IPS Observations

Ambient Solar Wind Models SAIC 3-D MHD steady state coronal model based on photospheric field maps CU/CIRES-NOAA/SEC 3-D solar wind model based on potential and current-sheet source surface empirical models [ SAIC maps – Pete Riley ][ WSA maps – Nick Arge ]

CME Cone Model [ Zhao et al., 2001 ] Best fitting for May 12, 1997 halo CME latitude: N3.0 longitude: W1.0 angular width: 50 deg velocity:650 km/s at 24 R s (14:15 UT) acceleration: 18.5 m/s 2

Time-Dependent Boundary Conditions

Transient Disturbances

Outflow Boundary Conditions ICME is launched at the streamer belt

Outflow Boundary Conditions ICME is launched at the streamer belt

B. 21 April 2002 and 24 August 2002 Events

2002 April 21 and 2002 August 24 Events Event Event Flare Characteristics Flare Location (deg)S15, W84S02, W81 Flare SizeX1.5/1FX3.1/1F Cone Model CME Location (deg)N00, W30N05, W25 CME Diameter (deg)5973 CME Speed (km/s) CME Timing (UT)03:30 – 04:3004: :30

Interplanetary Disturbances  Similar – Transient disturbances are centered east of the Sun-Earth line  Different – Ambient solar wind with and without an equatorial fast stream :00

21 April 2002 – IMF Lines

24 August 2002 – IMF Lines

21 April 2002 Quasi-parallel shock

24 August 2002 Quasi-perpendicular shock

Ambient Solar Wind – CR1988Ambient Solar Wind – CR1993 Transient Disturbances Limitations

C. 12 May 1997 Event

Latitudinal Distortion of ICME Shape ICME propagates into bi-modal solar wind

Evolution of Density Structure ICME propagates into the enhanced density of the streamer belt flow

Connectivity of IMF Lines IMF line connected to Earth by- passes the shock structure => Interplanetary CME-driven shock cannot generate energetic particles observed at Earth IMF line connected to Earth passes through the shock structure => Quasi-perpendicular shock can generate energetic particles under certain circumstances Early timeLater time

Connectivity of IMF Lines Important effect occurs away from the Sun-Earth line Enhanced shock interaction together with quasi- perpendicular propagation relative to IMF lines favors particle acceleration and generation of radio emission Global viewDetailed view

May 12, 1997 – Interplanetary Shock Shock propagates in a fast stream and merges with its leading edge Distribution of parameters in equatorial planeEvolution of velocity on Sun-Earth line 0.2 AU 0.4 AU 0.6 AU 0.8 AU 1.0 AU

Interplanetary Disturbances

Fast-Stream Position Ambient state before the CME launch Disturbed state during the CME launch Ambient state after the CME launch Case A1Case A3 [ SAIC maps -- Pete Riley ]

Effect of Fast-Stream Position [ SAIC maps -- Pete Riley ] Case A1Case A3 Earth : Interaction region followed by shock and CME (not observed) Earth : Shock and CME (observed but 3-day shift is too large)

Fast-Stream Evolution Ambient state before the CME launch Disturbed state during the CME launch Ambient state after the CME launch Case A2Case B2 [ SAIC maps -- Pete Riley ]

Effect of Fast-Stream Evolution [ SAIC maps -- Pete Riley ] Case A2Case B2 Earth : Interaction region followed by shock and CME (not observed) Earth : Shock and CME (observed but shock front is radial)

Fast-Stream Evolution Ambient state before the CME launch Disturbed state during the CME launch Ambient state after the CME launch Case A2Case B2 [ WSA maps -- Nick Arge ]

Effect of Fast-Stream Evolution Case A2Case B2 Earth : Interaction region followed by shock and CME (not observed) Earth : Shock and CME (observed but shock front is radial) [ WSA maps -- Nick Arge ]

Interplanetary Disturbances Case ACase C Accurate locations of stream boundaries and their rapid displacements are important for ICME properties at Earth

Backup

21 April 2002 Quasi-parallel shock

24 August 2002 Quasi-perpendicular shock

Interplanetary Disturbances

Connectivity of Magnetic Field Lines Quasi-parallel shock Quasi-perpendicular shock Interplanetary Event Interplanetary Event

CDP – Sample Web Pages [ ]

CDP – Organization of Data  MAIN – main entry for heliospheric data (top level CDP catalog)  Information – metadata, textual description, parameters, representative plots  Referenced Catalogs – computational project  Nested Datasets – case (input data), code (numerical model), run (output data)  Datafiles – input or output data (stored in NetCDF)