251 citations
- Max Planck Institute for Solar System ResearchDE11 papers
- Max Planck SocietyDE4 papers
- Monash UniversityAU4 papers
- Stanford UniversityUS4 papers
- Goddard Space Flight CenterUS2 papers
- Romanian AcademyRO2 papers
- Astronomical Institute of the Slovak Academy of SciencesSK1 paper
- Australian Regenerative Medicine InstituteAU1 paper
- Cooperative Institute for Research in Environmental SciencesUS1 paper
- Indian Institute of AstrophysicsIN1 paper
- Lockheed Martin (United States)US1 paper
- National Oceanic and Atmospheric AdministrationUS1 paper
23 papers
Helioseismology of Pre-Emerging Active Regions I: Overview, Data, and Target Selection Criteria
K. D. Leka, G. Barnes, A. C. Birch +4
This first paper in a series describes the design of a study testing whether pre-appearance signatures of solar magnetic active regions were detectable using various tools of local…
Helioseismology of Pre-Emerging Active Regions II: Average Emergence Properties
A. C. Birch, D. C. Braun, K. D. Leka +2
We report on average subsurface properties of pre-emerging active regions as compared to areas where no active region emergence was detected. Helioseismic holography is applied to…
Least-Squares Fitting Methods for Estimating the Winding Rate in Twisted Magnetic-Flux Tubes
Ashley D. Crouch
We investigate least-squares fitting methods for estimating the winding rate of field lines about the axis of twisted magnetic-flux tubes. These methods estimate the winding rate b…
Resolving the Azimuthal Ambiguity in Vector Magnetogram Data with the Divergence-Free Condition: the Effects of Noise and Limited Spatial Resolution
Ashley D. Crouch
We investigate how the azimuthal ambiguity in solar vector magnetogram data can be resolved by using the divergence-free property of magnetic fields. In a previous article, by Crou…
Determination of Electromagnetic Source Direction as an Eigenvalue Problem
Juan C. Martínez-Oliveros, Charles Lindsey, Stuart D. Bale +1
Low-frequency solar and interplanetary radio bursts are generated at frequencies below the ionospheric plasma cutoff and must therefore be measured in space, with deployable antenn…
The Critical Richardson Number and Limits of Applicability of Local Similarity Theory in the Stable Boundary Layer
Andrey A. Grachev, Edgar L Andreas, Christopher W. Fairall +2
Measurements of atmospheric turbulence made over the Arctic pack ice during the Surface Heat Budget of the Arctic Ocean experiment (SHEBA) are used to determine the limits of appli…