Astronomy and Astrophysics – Astronomy
Scientific paper
May 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011spd....42.2120h&link_type=abstract
American Astronomical Society, SPD meeting #42, #21.20; Bulletin of the American Astronomical Society, Vol. 43, 2011
Astronomy and Astrophysics
Astronomy
Scientific paper
The HMI is observing the line-of-sight magnetic field, vector field and the Doppler plasma velocity. The full-disk magnetogram observation with high temporal and spatial resolution provides better global solar magnetic field map, in that the data gap is minimized and the noise level is quite low.
To utilize the benefit of the HMI's magnetogram observation, we conducted the MHD simulation of the global solar corona using the HMI data. We chose a period around August 1st, 2010, to see how the magnetic field connectivity in the global scale had changed around the period: In early August period, the changes of the global coronal magnetic field seen at the entire Earth-side hemisphere seem to be well related with the emergence of the sunspot at the north-east part of the full disk images, though the dynamics involving both magnetic field and plasma will be retrieved by means of the MHD simulation models.
We used the synchronic frame format to make the global solar surface magnetic field maps so that the magnetic field distribution at the time of interest will be better specified thus the simulated situation will be more realistic. In addition, we used the daily-updated global maps that are made by regularly replacing the portion of the global map with the meridional slip of the full-disk data on regular (daily) basis as well as the standard ones that are well low-nose dataset made with better-calibrated data.
Hayashi Keiji
HMI Team
Hoeksema J.
Liu Ya-Ying
Sun Xiaosong
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