GONG Magnetograms Impact on CCMC Modeling

NASA Goddard Space Flight Center

P.MacNeice , L.Rastaetter, M.Hesse, A.Chulaki, M.Kuznetsova, A.Taktakishvili, M.Maddox

http://ccmc.gsfc.nasa.gov

Solar and Helio model Inventory

MAS (3D mhd < 30 ro)

ENLIL(3D mhd > 21.5 ro)

PFSS (< 2.5ro)

WSA (PFSS + CS <5ro or < 21.5 ro)

WSA Helio (Empirical/Kinematic < 1 AU)

SWMF Corona (3D mhd < 20 ro)

SWMF Helio (3D mhd 20 ro

to 1AU)

Heliospheric Tomography

Exospheric Solar Wind (1D Kinetic coronal hole model)

Coronal Tomography

NRL Coronal 3D MHD

ANMHDFluxonNLFFF (Wiegelmann)

Magnetograms In Model Chain

magnetograms

Wang-Sheeley-ArgePFSS

SWMF corona and helio

Harmonic coeffs

ENLIL

MAS

Kitt Peak

Mt Wilson

GONG

Wilcox

MDI

21.5ro 30ro

?? ??

WSA Solutions for Same CR 2047

NSO GONG - in test phase!

MWO

MDI

Not Approved for Public Release by Arge Enterprises

WSA Solutions for Same CR 2047

NSO GONG - in test phase!

Operational Modes

• ROR system

– uses monthly synoptic magnetograms

– offers ambient corona and heliosphere for archived data analysis

• ‘Realtime’ runs

– uses daily updated synoptic magnetograms

– ultimate goal to provide fieldline connectivity forecasts

• ‘Realtime’ cone models runs

– goal to provide earliest prediction of CME arrival times

• Magnetogram Issues

– Coverage and quality – impacts both ROR and realtime runs

– Frequency – GONG much higher cadence, important for realtime cone models

Magnetogram Synthesis

How will models use magnetograms to model evolving coronal structures?

• Next generation models must give the model developer the ability to construct global magnetograms with the best available data, on the surface grid of their choice, with the spatial and temporal resolution of their choice.

– Includes adaptively refining grids

• Falls neatly into gap between traditional ‘responsibilities’ of modelers and data providers - who is going to tackle this?

Magnetogram Synthesis

• Must blend disparate magnetogram sources– Photospheric and chromospheric– LOS and vector– Limited fov, full disk and synoptic

• Temporal and spatial interpolation problem subject to complex model constraints, eg

– div B=0– Minimizing surface currents introduced at stitch-up lines– Force free boundary condition support for FFF models– Surface flow analysis for MHD - vital to include data quality

measures with magnetograms– Conditioning magnetogram solution using coronal loop imaging

Magnetogram Synthesis (contd)

• Requires acquisition and processing of multiple data types (both magnetogram and coronal and chromospheric imaging).

• Chromospheric magnetograms - will also need to integrate data from multiple heights in the atmosphere – a task which will inevitably require model input.

• Requires a genuine ‘data assimilation’ supporting tool - perhaps the first real example of data assimilation in a solar context.

• Beginning to develop this infrastructure element– CCMC’s KAMELEON data formatter as core– Separate lightweight and heavyweight processing layers– CAD-like visualization support

Magnetogram Synthesis (contd)

Soliciting requirements input from model developers and magnetogram providers eg

– Model pre-processing requirements– What is possible in terms of magnetogram quality

measures