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Study of supergranules

Wang, Haimin and Zirin, Harold (1989) Study of supergranules. Solar Physics, 120 (1). pp. 1-17. ISSN 0038-0938. doi:10.1007/bf00148532.

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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.

Item Type:Article
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URLURL TypeDescription
Wang, Haimin0000-0002-5233-565X
Additional Information:© 1989 Kluwer Academic Publishers. Provided by the NASA Astrophysics Data System. Received 22 June 1988; Revised 17 October 1988; Issue Date March 1989. We wish to express our appreciations to staff at Big Bear Solar Observatory and National Solar Observatory/Kitt Peak for their support during observation runs. We are grateful to S. Martin, D. Gary, J. Kaufman, and F. Tang for reading the manuscript and giving helpful comments and suggestions. This work is supported by NSF under grant ATM-8513577 and NASA under grant NGL 05 002 034.
Funding AgencyGrant Number
NASANGL 05 002 034
Subject Keywords:Velocity Field; Flux Density; Magnetic Flux; Average Lifetime; Flux Element
Issue or Number:1
Record Number:CaltechAUTHORS:20200602-073011729
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Official Citation:Wang, H., Zirin, H. Study of supergranules. Sol Phys 120, 1–17 (1989).
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:103629
Deposited By: Tony Diaz
Deposited On:02 Jun 2020 16:10
Last Modified:16 Nov 2021 18:23

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