Articles | Volume 35, issue 1
Regular paper
05 Jan 2017
Regular paper |  | 05 Jan 2017

Absence of the strahl during times of slow wind

Chris Gurgiolo and Melvyn L. Goldstein

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Observations of diffusion in the electron halo and strahl
Chris Gurgiolo and Melvyn L. Goldstein
Ann. Geophys., 34, 1175–1189,,, 2016
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Characteristics of the Taylor microscale in the solar wind/foreshock: magnetic field and electron velocity measurements
C. Gurgiolo, M. L. Goldstein, W. H. Matthaeus, A. Viñas, and A. N. Fazakerley
Ann. Geophys., 31, 2063–2075,,, 2013
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Observations during periods when the solar wind has a speed < 425 km s−1 show that it is not uncommon to find no strahl present in the data. The research was done in response to observations and was performed through a detailed study of the electron velocity distribution functions. The conclusion arrived at is that the absence of the strahl appears to occur within individual flux tubes, which may indicate that the source lies in the solar corona where the strahl is formed.