53 citations · 61 across the 4 of their papers we have counts for
4 papers
Photospheric Velocities Measured at Mt. Wilson Show Zonal and Sectoral Flows Compose the Torsional Oscillations
Roger K. Ulrich, Tham Tran, John Boyden
The methods for reducing the observations from the 150-foot Tower Telescope on Mt.~Wilson are reviewed and a new method for determining the North/South (sectoral) and the East/West…
Solar Sources of Interplanetary Magnetic Clouds Leading to Helicity Prediction
Roger K. Ulrich, Pete Riley, T. Tran
This study identifies the solar origins of magnetic clouds that are observed at 1 AU and predicts the helical handedness of these clouds from the solar surface magnetic fields. We…
Generation of a North/South Magnetic Field Component from Variations in the Photospheric Magnetic Field
Roger K. Ulrich, Tham Tran
We address the problem of calculating the transverse magnetic field in the solar wind outside of the hypothetical sphere called the source surface where the solar wind originates.…
The global solar magnetic field -- identification of travelling, long-lived ripples
Roger K. Ulrich, Tham Tran
We have examined the global structure of the solar magnetic field using data from the FeI spectral line at λ5250.2Å obtained at the 150-foot tower telescope at the Mt. Wilson Obser…