Search: id:"swepub:oai:DiVA.org:umu-173713" >
Propagating and Dyn...
Propagating and Dynamic Properties of Magnetic Dips in the Dayside Magnetosheath : MMS Observations
-
Yao, S. T. (author)
-
- Hamrin, Maria, 1972- (author)
- Umeå universitet,Institutionen för fysik
-
Shi, Q. Q. (author)
-
show more...
-
Yao, Z. H. (author)
-
Degeling, A. W. (author)
-
Zong, Q. -G (author)
-
Liu, H. (author)
-
Tian, A. M. (author)
-
Liu, J. (author)
-
Hu, H. Q. (author)
-
Li, B. (author)
-
Bai, S. C. (author)
-
Russell, C. T. (author)
-
Giles, B. L. (author)
-
show less...
-
(creator_code:org_t)
- American Geophysical Union (AGU), 2020
- 2020
- English.
-
In: Journal of Geophysical Research - Space Physics. - : American Geophysical Union (AGU). - 2169-9380 .- 2169-9402. ; 125:6
- Related links:
-
https://urn.kb.se/re...
-
show more...
-
https://doi.org/10.1...
-
show less...
Abstract
Subject headings
Close
- The magnetosheath is inherently complex and rich, exhibiting various kinds of structures and perturbations. It is important to understand how these structures propagate and evolve and how they relate to the perturbations. Here we investigate a kind of magnetosheath structure known as a magnetic dip (MD). As far as we are aware, there have been no previous studies concerning the evolution (contracting or expanding) of these types of structures, and their propagation properties cannot be unambiguously determined. In this study, using Magnetospheric MultiScale (MMS) high-temporal resolution data and multispacecraft analysis methods, we obtain the propagation and dynamic features of a set of MDs. Four different types of MDs are identified: "frozen-in," "expanding," "contracting," and "stable-propagating." Significantly, a stable-propagation event is observed with a sunward propagation component. This indicates that the source of the structure in this case is closely associated with the magnetopause, which provides strong support to the contention in earlier research. We further reveal the mechanism leading to the MD contraction or expansion. The motion of the MDs boundary is found closely related with the dynamic pressure. The scale of the contracting and expanding events are typically similar to 5-20 rho(i) (ion gyroradius), significantly smaller than that of frozen-in events (similar to 40 rho(i)). The observations could relate large-scale (more than several tens of rho(i)) and kinetic-scale (less than rho(i)) MDs, by revealing an evolution that spans these different scales, and help us better understand the variation and dynamics of magnetosheath structures and plasmas.
Subject headings
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Publication and Content Type
- ref (subject category)
- art (subject category)
Find in a library
To the university's database
- By the author/editor
-
Yao, S. T.
-
Hamrin, Maria, 1 ...
-
Shi, Q. Q.
-
Yao, Z. H.
-
Degeling, A. W.
-
Zong, Q. -G
-
show more...
-
Liu, H.
-
Tian, A. M.
-
Liu, J.
-
Hu, H. Q.
-
Li, B.
-
Bai, S. C.
-
Russell, C. T.
-
Giles, B. L.
-
show less...
- About the subject
-
- NATURAL SCIENCES
-
NATURAL SCIENCES
-
and Physical Science ...
-
and Astronomy Astrop ...
- Articles in the publication
-
Journal of Geoph ...
- By the university
-
Umeå University