129 citations · 200 across the 4 of their papers we have counts for
5 papers
Radiative transfer effects on Doppler measurements as sources of surface effects in sunspot seismology
S. P. Rajaguru, K. Sankarasubramanian, R. Wachter +1
We show that the use of Doppler shifts of Zeeman sensitive spectral lines to observe wavesn in sunspots is subject to measurement specific phase shifts arising from, (i) altered he…
Magnetic field vector retrieval with the Helioseismic and Magnetic Imager
J. M. Borrero, S. Tomczyk, A. Norton +5
We investigate the accuracy to which we can retrieve the solar photospheric magnetic field vector using the Helioseismic and Magnetic Imager (HMI) that will fly onboard of the Sola…
Spectral Line Selection for HMI: A Comparison of Fe I 6173 and Ni I 6768
A. A. Norton, J. Pietarila Graham, R. K. Ulrich +8
We present a study of two spectral lines, Fe I 6173 Angstroms and Ni I 6768 Angstroms, that were candidates to be used in the Helioseismic and Magnetic Imager (HMI) for observing D…
Magnetic field vector retrieval with HMI
J. M. Borrero, S. Tomczyk, A. Norton +5
The Helioseismic and Magnetic Imager (HMI), on board the Solar Dynamics Observatory (SDO), will begin data acquisition in 2008. It will provide the first full disk, high temporal c…
Magnetic topologies and two-class coronal mass ejections: a numerical magnetohydrodynamic study
W. Liu, X. P. Zhao, S. T. Wu +1
White-light observations of the solar corona show that there are two characteristic types of Coronal Mass Ejections (CMEs) in terms of speed-height profiles: so-called fast CMEs th…