Errors in the magnetic field vector determination with HMI

HMI+AIA Meeting, Monterey, Feb 14 2006

Juan M Borrero

Steven Tomczyk

Aimee Norton

Jesper Schou

Overview

Simulations: synthesis & inversion

Adding Solar p-modes

Adding noise

Temporal averages

HMI expected errors in B-field determination

Future work & Improvements

HMI+AIA Meeting, Monterey, Feb 14 2006

Simulations: synthesis & inversion

HMI+AIA Meeting, Monterey, Feb 14 2006

Adding Solar p modes

HMI+AIA Meeting, Monterey, Feb 14 2006

Adding photon noise

HMI+AIA Meeting, Monterey, Feb 14 2006

Temporal averages (1)

HMI+AIA Meeting, Monterey, Feb 14 2006

Temporal averages (2)

HMI+AIA Meeting, Monterey, Feb 14 2006

HMI expected errors (1)

HMI+AIA Meeting, Monterey, Feb 14 2006

HMI expected errors (2)

HMI+AIA Meeting, Monterey, Feb 14 2006

download document at: http://web.hao.ucar.edu/hmi

Future work

Speed of the inversion

Shown simulations: 15 pixels/min

Current: 150000 pixels/min (SVM in progress)

Goal: 1600000 pixels/min

Non-magnetic component

These simulations are simple !

Use more complex atmosphere for the synthesis

Compare with Stokes profiles emerging from 3D simulations

HMI+AIA Meeting, Monterey, Feb 14 2006

Stokes Profiles

HMI+AIA Meeting, Monterey, Feb 14 2006

HMI Filters

HMI+AIA Meeting, Monterey, Feb 14 2006

Solar p modes

Support vector machines

HMI+AIA Meeting, Monterey, Feb 14 2006

are obtained through statistical learning (Vapnik & Chervonenkis 1968; 1974 ...)

provided multiples examples of:

there is a trade off between #sv, accuracy, speed and generality

Comparison with simulations

HMI+AIA Meeting, Monterey, Feb 14 2006

Courtesy of Alexander Voegler & Luis Bellot

2006-02-09T10:43:12