Evidence of filament upflows originating from intensity oscillations on the solar surface

Document Type

Article

Publication Date

8-10-2010

Abstract

A filament footpoint rooted in an active region (NOAA 11032) was well observed for about 78 minutes with the 1.6 m New Solar Telescope at the Big Bear Solar Observatory on 2009 November 18 in Hα ±0.75 Å. This data set had high cadence (∼15 s) and high spatial resolution (∼0.″1) and offered a unique opportunity to study filament dynamics. As in previous findings from space observations, several dark intermittent upflows were identified, and they behave in groups at isolated locations along the filament. However, we have two new findings. First, we find that the dark upflows propagating along the filament channel are strongly associated with the intensity oscillations on the solar surface around the filament footpoints. The upflows start at the same time as the peak in the oscillations, illustrating that the upflow velocities are well correlated with the oscillations. Second, the intensity of one of the seven upflows detected in our data set exhibits a clear periodicity when the upflow propagates along the filament. The periods gradually vary from ∼10 to ∼5 minutes. Our results give observational clues on the driving mechanism of the upflows in the filament. © 2010. The American Astronomical Society. All rights reserved.

Identifier

77958126927 (Scopus)

Publication Title

Astrophysical Journal Letters

External Full Text Location

https://doi.org/10.1088/2041-8205/719/1/L95

e-ISSN

20418213

ISSN

20418205

First Page

L95

Last Page

L98

Issue

1 PART 2

Volume

719

Grant

0847126

Fund Ref

National Science Foundation

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