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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.

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Presentation on theme: "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."— Presentation transcript:

1 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

2 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

3 Simulations: synthesis & inversion HMI+AIA Meeting, Monterey, Feb 14 2006

4 Adding Solar p modes HMI+AIA Meeting, Monterey, Feb 14 2006

5 Adding photon noise HMI+AIA Meeting, Monterey, Feb 14 2006

6 Temporal averages (1) HMI+AIA Meeting, Monterey, Feb 14 2006

7 Temporal averages (2) HMI+AIA Meeting, Monterey, Feb 14 2006

8 HMI expected errors (1) HMI+AIA Meeting, Monterey, Feb 14 2006

9 HMI expected errors (2) HMI+AIA Meeting, Monterey, Feb 14 2006 download document at: http://web.hao.ucar.edu/hmi

10 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

11 Stokes Profiles HMI+AIA Meeting, Monterey, Feb 14 2006

12 HMI Filters HMI+AIA Meeting, Monterey, Feb 14 2006

13 Solar p modes

14 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

15 Comparison with simulations HMI+AIA Meeting, Monterey, Feb 14 2006 Courtesy of Alexander Voegler & Luis Bellot

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