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

The influence of the sunspot model on the Li-abundance

Solar Physics ◽  
1971 ◽  
Vol 21 (1) ◽  
pp. 96-100 ◽  
Author(s):  
G. Stellmacher ◽  
E. Wiehr
Keyword(s):  
Sunspot Model

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.

scholarly journals A topological analysis of the magnetic breakout model for an eruptive solar flare

2005 ◽  
Vol 461 (2059) ◽  
pp. 2099-2120 ◽  
Author(s):  
Rhona Maclean ◽  
Colin Beveridge ◽  
Dana Longcope ◽  
Daniel Brown ◽  
Eric Priest
Keyword(s):  
Solar Flare ◽  
Magnetic Reconnection ◽  
Topological Analysis ◽  
Null Point ◽  
Topological Approach ◽  
Sunspot Model ◽  
New Class ◽  
Linear Force ◽  
Field Lines

The magnetic breakout model gives an elegant explanation for the onset of an eruptive solar flare, involving magnetic reconnection at a coronal null point which leads to the initially enclosed flux ‘breaking out’ to large distances. In this paper we take a topological approach to the study of the conditions required for this breakout phenomenon to occur. The evolution of a simple delta sunspot model, up to the point of breakout, is analysed through several sequences of potential and linear force-free quasi-static equilibria. We show that any new class of field lines, such as those connecting to large distances, must be created through a global topological bifurcation and derive rules to predict the topological reconfiguration due to various types of bifurcation.

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
Sign in / Sign up

Export Citation Format

Share Document