A Check for Consistency between Different Magnetic Helicity Measurements Based on the Helicity Conservation Principle

Details A Check for Consistency between Different Magnetic Helicity Measurements Based on the Helicity Conservation Principle A Check for Consistency between Different Magnetic Helicity Measurements Based on the Helicity Conservation Principle

Feb 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007apj...656.1167l&link_type=abstract

The Astrophysical Journal, Volume 656, Issue 2, pp. 1167-1172.

Astronomy and Astrophysics

Astronomy

15

Sun: Corona, Sun: Coronal Mass Ejections (Cmes), Sun: Magnetic Fields, Sun: Photosphere

Scientific paper

Magnetic helicity is a useful quantity in characterizing the magnetic systems of solar active regions. The purpose of the present work is to check for consistency between the local correlation tracking (LCT) method used to measure helicity injection through the photosphere, and the linear force-free field (LFFF) method used to determine helicity in the corona, based on the principle of helicity conservation in the solar corona. We have calculated the amount of magnetic helicity injected through the photosphere during the first disk passage of AR 10696 using the LCT method initially described by Chae. We have also measured the coronal magnetic helicity as a function of time using the LFFF method. With a value for the force-free α, the coronal field is constructed from the extrapolation of the Solar and Heliospheric Observatory (SOHO) MDI magnetograms, then compared with the coronal loops in the EUV images taken by the SOHO EIT. The force-free α that best fits the loops is used to calculate the coronal helicity. From a careful comparison of different helicity measurements during each time interval, we have reached the core conclusion that our measurements follow the helicity conservation principle with an uncertainty of ~15% and hence support the consistency between the two different methods with the same amount of uncertainty.

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