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20 papers
Uniting The Sun's Hale Magnetic Cycle and `Extended Solar Cycle' Paradigms
Scott W. McIntosh, Phillip H. Scherrer, Leif Svalgaard +1
Through meticulous daily observation of the Sun's large-scale magnetic field the Wilcox Solar Observatory (WSO) has catalogued two magnetic (Hale) cycles of solar activity. Those t…
A Critical Evaluation of Recent Claims Concerning Solar Rotation
P. H. Scherrer, D. O. Gough
Fossat et al. (2017) recently reported detecting rotational splitting of g modes indirectly via the interaction with p modes observed directly by the GOLF instrument on SOHO. They…
Classifying Signatures of Sudden Ionospheric Disturbances
Sahil Hegde, Monica G. Bobra, Philip H. Scherrer
Solar activity, such as flares, produce bursts of high-energy radiation that temporarily enhance the D-region of the ionosphere and attenuate low-frequency radio waves. To track th…
Statistical analysis of acoustic wave power and flows around solar active regions
M. Cristina Rabello-Soares, Richard S. Bogart, Philip H. Scherrer
We analyze the effect of a sunspot in its quiet surroundings applying a helioseismic technique on almost three years of Helioseismic and Magnetic Imager (HMI) observations obtained…
On-Orbit Performance of the Helioseismic and Magnetic Imager Instrument onboard the Solar Dynamics Observatory
J. Todd Hoeksema, Charles S. Baldner, Rock I. Bush +2
The Helioseismic and Magnetic Imager (HMI) instrument is a major component of NASA's Solar Dynamics Observatory (SDO) spacecraft. Since beginning normal science operations on 1 May…
Statistical analysis of acoustic wave parameters near active regions
M. Cristina Rabello Soares, Richard S. Bogart, Philip H. Scherrer
In order to quantify the influence of magnetic fields on acoustic mode parameters and flows in and around active regions, we analyse the differences in the parameters in magnetical…