1. Главная
  2. Ресурсы
  3. Библиотечный поиск
Sharp AlfvénicImpulses in theNear-Sun Solar Wind T. S. HorburyT. WoolleyR. Laker2020 год

Sharp Alfvénic Impulses in the Near-Sun Solar Wind
статья из журнала

Полный текстСтраница публикацииПубликация в OpenAlex
Аннотация: Abstract Measurements of the near-Sun solar wind by the Parker Solar Probe have revealed the presence of large numbers of discrete Alfvénic impulses with an anti-sunward sense of propagation. These are similar to those previously observed near 1 au, in high speed streams over the Sun’s poles and at 60 solar radii. At 35 solar radii, however, they are typically shorter and sharper than seen elsewhere. In addition, these spikes occur in “patches” and there are also clear periods within the same stream when they do not occur; the timescale of these patches might be related to the rate at which the spacecraft magnetic footpoint tracks across the coronal hole from which the plasma originated. While the velocity fluctuations associated with these spikes are typically under 100 km s −1 , due to the rather low Alfvén speeds in the streams observed by the spacecraft to date, these are still associated with large angular deflections of the magnetic field—and these deflections are not isotropic. These deflections do not appear to be related to the recently reported large-scale, pro-rotation solar wind flow. Estimates of the size and shape of the spikes reveal high aspect ratio flow-aligned structures with a transverse scale of ≈10 4 km. These events might be signatures of near-Sun impulsive reconnection events.
Год издания: 2020
Авторы: T. S. Horbury, T. Woolley, R. Laker, Lorenzo Matteini, J. P. Eastwood, S. D. Bale, M. Velli, Benjamin D. G. Chandran, T. D. Phan, N. E. Raouafi, K. Goetz, P. Harvey, M. Pulupa, K. G. Klein, Thierry Dudok de Wit, J. C. Kasper, K. E. Korreck, A. W. Case, M. L. Stevens, P. L. Whittlesey, D. E. Larson, R. J. MacDowall, D. Malaspina, R. Livi
Издательство: Institute of Physics
Источник: The Astrophysical Journal Supplement Series
Ключевые слова: Solar and Space Plasma Dynamics, Ionosphere and magnetosphere dynamics, Astro and Planetary Science
Другие ссылки: The Astrophysical Journal Supplement Series (PDF)
The Astrophysical Journal Supplement Series (HTML)
insu.hal.science (HTML)
insu.hal.science (HTML)
HAL (Le Centre pour la Communication Scientifique Directe) (HTML)
HAL (Le Centre pour la Communication Scientifique Directe) (HTML)