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Title: UMBRAL DYNAMICS IN THE NEAR-INFRARED CONTINUUM

Abstract

We detected peaks of oscillatory power at 3 and {approx}6.5 minutes in the umbra of the central sunspot of the active region NOAA AR 10707 in data obtained in the near-infrared (NIR) continuum at 1565.7 nm. The NIR data set captured umbral dynamics around 50 km below the {tau}{sub 500} = 1 level. The umbra does not oscillate as a whole, but rather in distinct parts that are distributed over the umbral surface. The most powerful oscillations, close to a period of {approx}6.5, do not propagate upward. We noted a plethora of large umbral dots (UDs) that persisted for {>=}30 minutes and stayed in the same locations. The peaks of oscillatory power above the detected UDs are located at 3 and 5 minute oscillations, but are very weak in comparison with the oscillations of {approx}6.5 minutes.

Authors:
; ;  [1]
  1. Also at Big Bear Solar Observatory, 40398 North Shore Lane, Big Bear City, CA 92314 (United States)
Publication Date:
OSTI Identifier:
21578289
Resource Type:
Journal Article
Journal Name:
Astrophysical Journal
Additional Journal Information:
Journal Volume: 736; Journal Issue: 2; Other Information: DOI: 10.1088/0004-637X/736/2/79; Journal ID: ISSN 0004-637X
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; NEAR INFRARED RADIATION; OSCILLATIONS; SUN; SUNSPOTS; ELECTROMAGNETIC RADIATION; INFRARED RADIATION; MAIN SEQUENCE STARS; RADIATIONS; SOLAR ACTIVITY; STARS; STARSPOTS; STELLAR ACTIVITY

Citation Formats

Andic, A., Cao, W., and Goode, P. R.. UMBRAL DYNAMICS IN THE NEAR-INFRARED CONTINUUM. United States: N. p., 2011. Web. doi:10.1088/0004-637X/736/2/79.
Andic, A., Cao, W., & Goode, P. R.. UMBRAL DYNAMICS IN THE NEAR-INFRARED CONTINUUM. United States. doi:10.1088/0004-637X/736/2/79.
Andic, A., Cao, W., and Goode, P. R.. Mon . "UMBRAL DYNAMICS IN THE NEAR-INFRARED CONTINUUM". United States. doi:10.1088/0004-637X/736/2/79.
@article{osti_21578289,
title = {UMBRAL DYNAMICS IN THE NEAR-INFRARED CONTINUUM},
author = {Andic, A. and Cao, W. and Goode, P. R.},
abstractNote = {We detected peaks of oscillatory power at 3 and {approx}6.5 minutes in the umbra of the central sunspot of the active region NOAA AR 10707 in data obtained in the near-infrared (NIR) continuum at 1565.7 nm. The NIR data set captured umbral dynamics around 50 km below the {tau}{sub 500} = 1 level. The umbra does not oscillate as a whole, but rather in distinct parts that are distributed over the umbral surface. The most powerful oscillations, close to a period of {approx}6.5, do not propagate upward. We noted a plethora of large umbral dots (UDs) that persisted for {>=}30 minutes and stayed in the same locations. The peaks of oscillatory power above the detected UDs are located at 3 and 5 minute oscillations, but are very weak in comparison with the oscillations of {approx}6.5 minutes.},
doi = {10.1088/0004-637X/736/2/79},
journal = {Astrophysical Journal},
issn = {0004-637X},
number = 2,
volume = 736,
place = {United States},
year = {2011},
month = {8}
}