Abstract
The influence of the flow helicity on kinematic fast dynamo action is considered. Three different flows are studied, possessing identical chaotic properties but very different distributions of helicity (maximal helicity, zero net helicity and zero helicity density). All three flows provide strong evidence of fast dynamo action, indicating that helicity is not a crucial feature of fast dynamo flows. Comparisons are made between the magnetic fields generated by the three flows and it is established how certain key quantities scale with the magnetic Reynolds number. In particular, it is shown that the relative magnetic helicity tends to zero as the magnetic Reynolds number tends to infinity.
| Original language | English |
|---|---|
| Pages (from-to) | 167-172 |
| Number of pages | 6 |
| Journal | Physics Letters, Section A: General, Atomic and Solid State Physics |
| Volume | 223 |
| Issue number | 3 |
| DOIs | |
| Publication status | Published - 2 Dec 1996 |
| Externally published | Yes |
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ASJC Scopus subject areas
- Physics and Astronomy(all)
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Kinetic helicity, magnetic helicity and fast dynamo action. / Hughes, David W.; Cattaneo, Fausto; Kim, Eun Jin.
In: Physics Letters, Section A: General, Atomic and Solid State Physics, Vol. 223, No. 3, 02.12.1996, p. 167-172.Research output: Contribution to journal › Article
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TY - JOUR
T1 - Kinetic helicity, magnetic helicity and fast dynamo action
AU - Hughes, David W.
AU - Cattaneo, Fausto
AU - Kim, Eun Jin
PY - 1996/12/2
Y1 - 1996/12/2
N2 - The influence of the flow helicity on kinematic fast dynamo action is considered. Three different flows are studied, possessing identical chaotic properties but very different distributions of helicity (maximal helicity, zero net helicity and zero helicity density). All three flows provide strong evidence of fast dynamo action, indicating that helicity is not a crucial feature of fast dynamo flows. Comparisons are made between the magnetic fields generated by the three flows and it is established how certain key quantities scale with the magnetic Reynolds number. In particular, it is shown that the relative magnetic helicity tends to zero as the magnetic Reynolds number tends to infinity.
AB - The influence of the flow helicity on kinematic fast dynamo action is considered. Three different flows are studied, possessing identical chaotic properties but very different distributions of helicity (maximal helicity, zero net helicity and zero helicity density). All three flows provide strong evidence of fast dynamo action, indicating that helicity is not a crucial feature of fast dynamo flows. Comparisons are made between the magnetic fields generated by the three flows and it is established how certain key quantities scale with the magnetic Reynolds number. In particular, it is shown that the relative magnetic helicity tends to zero as the magnetic Reynolds number tends to infinity.
UR - http://www.scopus.com/inward/record.url?scp=0010467806&partnerID=8YFLogxK
U2 - 10.1016/S0375-9601(96)00722-0
DO - 10.1016/S0375-9601(96)00722-0
M3 - Article
VL - 223
SP - 167
EP - 172
JO - Physics Letters A
JF - Physics Letters A
SN - 0375-9601
IS - 3
ER -