Sunspot umbral oscillations in Mgii k

Solar Physics ◽  
1987 ◽  
Vol 108 (1) ◽  
pp. 61-75 ◽  
Author(s):  
Joseph B. Gurman
Keyword(s):  
Umbral Oscillations

Where do running penumbral waves emerge in chromosphere?

2018 ◽  
Vol 13 (S340) ◽  
pp. 155-156
Author(s):  
T. G. Priya ◽  
Jiangtao Su ◽  
Robertus Erd̎elyi
Keyword(s):  
Active Region ◽  
Active Region Noaa ◽  
Long Period ◽  
Wave Guides ◽  
Spiral Structures ◽  
Region Noaa ◽  
Umbral Oscillations

AbstractThe earlier work on the oscillatory phenomena in sunspot structures have supported in validating the detection of long-period oscillations, which are generated by the photospheric umbral response to the five minute p-mode global oscillations. We report here on the events of 3- min umbral oscillations which are detected within a duration of one hour from a single-polarity sunspot of active region NOAA 12132. The umbral oscillations that appear first around umbral boundaries is speculated to be excited by the wavefronts at the umbral-penumbral boundaries due to sub-photospheric or photospheric granular buffetings. The appearance of the wavefronts in spiral structures suggests that the wave guides are twisted. In addition, the newly formed running penumbral waves (RPWs) appears to be connected with the preceding RPWs.

Simultaneous measurements of sunspot umbral oscillations in the photosphere, chromosphere, and transition region

1987 ◽  
Vol 312 ◽  
pp. 457 ◽  
Author(s):  
John H. Thomas ◽  
Bruce W. Lites ◽  
Joseph B. Gurman ◽  
Edwin F. Ladd
Keyword(s):  
Transition Region ◽  
Simultaneous Measurements ◽  
Umbral Oscillations

Umbral oscillations and penumbral waves in H?

Solar Physics ◽  
1975 ◽  
Vol 41 (1) ◽  
pp. 81-88 ◽  
Author(s):  
R. L. Moore ◽  
Frances Tang
Keyword(s):  
Umbral Oscillations

The spectrum of umbral oscillations of the Scheuer-Thomas sunspot model

Solar Physics ◽  
1987 ◽  
Vol 109 (2) ◽  
pp. 403-404 ◽  
Author(s):  
V. I. Zhukov ◽  
V. I. Efremov ◽  
B. T. Nuraliev
Keyword(s):  
Sunspot Model ◽  
Umbral Oscillations
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