Study of supergranules

Haimin Wang; Harold Zirin

doi:10.1007/BF00148532

Study of supergranules

Haimin Wang, Harold Zirin

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34 Scopus citations

Abstract

Results of a detailed study on supergranule lifetime and velocity fields are presented. We show the correlation between the observed downdraft velocity and the network magnetic flux elements on the quiet sun. After excluding areas with magnetic flux density ≥ 25 G, we find that the upper limit of the supergranule vertical speed is 0.1 km s^-1 for both downdraft and updraft, and the r.m.s. speed is 0.03 km s^-1. By observing the evolution of individual supergranules, we find that the average lifetime of supergranules might be ≥ 50 hours. We describe different ways of formation and decay of supergranular cells. New cells usually form in an area containing no pre-existing supergranule velocity fields. Cells may disappear in two ways: fragmentation and fading away.

Original language	English (US)
Pages (from-to)	1-17
Number of pages	17
Journal	Solar Physics
Volume	120
Issue number	1
DOIs	https://doi.org/10.1007/BF00148532
State	Published - Mar 1989

All Science Journal Classification (ASJC) codes

Astronomy and Astrophysics
Space and Planetary Science

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10.1007/BF00148532

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title = "Study of supergranules",

abstract = "Results of a detailed study on supergranule lifetime and velocity fields are presented. We show the correlation between the observed downdraft velocity and the network magnetic flux elements on the quiet sun. After excluding areas with magnetic flux density ≥ 25 G, we find that the upper limit of the supergranule vertical speed is 0.1 km s-1 for both downdraft and updraft, and the r.m.s. speed is 0.03 km s-1. By observing the evolution of individual supergranules, we find that the average lifetime of supergranules might be ≥ 50 hours. We describe different ways of formation and decay of supergranular cells. New cells usually form in an area containing no pre-existing supergranule velocity fields. Cells may disappear in two ways: fragmentation and fading away.",

author = "Haimin Wang and Harold Zirin",

year = "1989",

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doi = "10.1007/BF00148532",

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T1 - Study of supergranules

AU - Wang, Haimin

AU - Zirin, Harold

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N2 - Results of a detailed study on supergranule lifetime and velocity fields are presented. We show the correlation between the observed downdraft velocity and the network magnetic flux elements on the quiet sun. After excluding areas with magnetic flux density ≥ 25 G, we find that the upper limit of the supergranule vertical speed is 0.1 km s-1 for both downdraft and updraft, and the r.m.s. speed is 0.03 km s-1. By observing the evolution of individual supergranules, we find that the average lifetime of supergranules might be ≥ 50 hours. We describe different ways of formation and decay of supergranular cells. New cells usually form in an area containing no pre-existing supergranule velocity fields. Cells may disappear in two ways: fragmentation and fading away.

AB - Results of a detailed study on supergranule lifetime and velocity fields are presented. We show the correlation between the observed downdraft velocity and the network magnetic flux elements on the quiet sun. After excluding areas with magnetic flux density ≥ 25 G, we find that the upper limit of the supergranule vertical speed is 0.1 km s-1 for both downdraft and updraft, and the r.m.s. speed is 0.03 km s-1. By observing the evolution of individual supergranules, we find that the average lifetime of supergranules might be ≥ 50 hours. We describe different ways of formation and decay of supergranular cells. New cells usually form in an area containing no pre-existing supergranule velocity fields. Cells may disappear in two ways: fragmentation and fading away.

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JF - Solar Physics

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Study of supergranules

Abstract

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