THE ROTATION OF THE WHITE LIGHT SOLAR CORONA AT HEIGHT 4 R☉ FROM 1996 TO 2010: A TOMOGRAPHICAL STUDY OF LARGE ANGLE AND SPECTROMETRIC CORONAGRAPH C2 OBSERVATIONS
THE ROTATION OF THE WHITE LIGHT SOLAR CORONA AT HEIGHT 4 R☉ FROM 1996 TO 2010: A TOMOGRAPHICAL STUDY OF LARGE ANGLE AND SPECTROMETRIC CORONAGRAPH C2 OBSERVATIONS
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1996年至2010年白光日冕在4 R☉高度的旋转：大角度和光谱日冕仪C2观测的层析成像研究
DOI：
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发表时间：
2011
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通讯作者：
H. Morgan
中科院分区：
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作者：
H. Morgan
太阳旋转断层扫描应用于大角度光谱日冕仪 (LASCO) C2/太阳和日光层天文台 (SOHO) 1996-2010 年期间的观测，产生一组 4 R☉ 高度的电子密度图，从中可以计算旋转速率。测量到旋转速率的大变化。速率由卡林顿自转速率（14.18 deg d−1 恒星）主导，但有时在太阳周期中，速率是在相对于卡林顿自转速率的-3 到 3 deg d−1 之间测量的。不同纬度之间，甚至相邻纬度之间，自转速率可能存在很大差异。它们可以在很长一段时间内保持相对稳定或平稳变化，也可以相当突然地变化。对于某些纬度（例如，太阳活动极大期的赤道），存在一些时期，其运动主要是快速的结构重组，而不是连贯的旋转。这些结果提出了有关太阳与日冕之间联系的新问题，并为日冕结构演化的解释和大型日冕模型的发展提供了新的挑战。特别是，立交重联能否解释旋转速率在纬度上的巨大差异，以及什么机制可以解释旋转速率的突然变化？
Solar rotational tomography is applied to Large Angle and Spectrometric Coronagraph (LASCO) C2/Solar and Heliospheric Observatory (SOHO) observations covering the period 1996–2010, resulting in a set of electron density maps at a height of 4 R☉ from which rotation rates can be calculated. Large variation of rotation rates is measured. Rates are dominated by the Carrington rotation rate (14.18 deg d−1 sidereal), but at times over the solar cycle, rates are measured between −3 and 3 deg d−1 relative to the Carrington rotation rate. Rotation rates can vary considerably between latitudes, even between neighboring latitudes. They can remain relatively stable or change smoothly over long periods of times, or can change rather abruptly. There are periods for certain latitudes (for example, the equator at solar maximum) when the movement is dominated by rapid structural reconfiguration, not a coherent rotation. These results raise new questions regarding the link between the Sun and the corona, and provide fresh challenges to interpretations of the coronal structural evolution and the development of large-scale coronal models. In particular, can interchange reconnection provide an explanation of the considerable latitudinal differences in rotation rates, and what mechanism can explain abrupt changes in rotation rates?