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The topological properties of magnetic helicity
The relation of magnetic helicity to the topological structure of field lines is discussed. If space is divided into a collection of flux tubes, magnetic helicity arises from internal structure…
Excitation of the Hydrogen 21-CM Line
- G. Field
- PhysicsProceedings of the IRE
- 1958
The importance of spin temperature for 21-cm line studies is reviewed, and four mechanisms which affect it are studied. Two of the mechanisms, collisions with free electrons and interactions with…
Astronomy and Astrophysics for the 1980s
- G. Field
- Physics
- 1 April 1982
Astronomy is in a golden age. Discoveries since 1960 include quasars (1963), the cosmic microwave background radiation (1965), pulsars (1967), neutronstar binaries (1970), superluminal expansion of…
Spectroscopic Constraints on Models of Ion Cyclotron Resonance Heating in the Polar Solar Corona and High-Speed Solar Wind
- S. Cranmer, G. Field, J. Kohl
- Physics
- 20 June 1999
Using empirical ion velocity distributions derived from Ultraviolet Coronagraph Spectrometer (UVCS) and Solar Ultraviolet Measurements of Emitted Radiation (SUMER) ultraviolet spectroscopy, we…
New dynamical mean-field dynamo theory and closure approach.
- E. Blackman, G. Field
- Physics, MedicinePhysical review letters
- 22 July 2002
We develop a new nonlinear mean field dynamo theory that couples field growth to the time evolution of the magnetic helicity and the turbulent electromotive force, E. We show that the difference…
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