Doyle, J. G. ; Banerjee, D. ; Perez, M. E. (1998) Coronal line-width variations Solar Physics, 181 (1). pp. 91-101. ISSN 0038-0938
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Official URL: http://doi.org/10.1023/A:1005019931323
Related URL: http://dx.doi.org/10.1023/A:1005019931323
Abstract
Line-width measurements of the coronal ion Siviii confirm earlier observations which show an increase in the non-thermal velocity above the solar limb. The present data, taken at the equatorial limb, show an increase from 24 km s-1 at the limb to 28 km s-1 some 25000 km above the limb. The electron density as measured from the Siviii line pair shows a decrease from 3.5 × 108 cm-3 to 1.8 × 108 cm-3 over the same distance. These data imply that the non-thermal velocity is inversely proportional to the quadratic root of the electron density, in excellent agreement with that predicted for undamped radially propagating Alfvén waves.
| Item Type: | Article |
|---|---|
| Source: | Copyright of this article belongs to Springer Nature Switzerland AG. |
| Keywords: | Excellent Agreement; Early Observation; Line Pair; Solar Limb; Quadratic Root. |
| ID Code: | 115716 |
| Deposited On: | 18 Mar 2021 05:02 |
| Last Modified: | 18 Mar 2021 05:02 |
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