后来，他发现了一个太阳黑子群，它存在时间很长，从太阳的西边消失，又在东边出现，最后又回到原来的位置。
Afterwards he found a sunspot group which lived long enough to disappear from view on the western limb of the sun, to reappear on its eastern limb, and finally to regain its old position.
上星期，人们用地面望远镜观测到了这一太阳黑子群。
The monster spot came into view of Earth-bound telescopes last week.
天文学家很快就发现这不是普通的太阳黑子，而是个巨型黑子群，其中有些黑子比地球还要大的多。
Astronomers soon realized this is not your average sunspot-it's a giant cluster of sunspots, several of which are larger than our entire planet.
当太阳黑子磁环从太阳对流层深层上浮到太阳表面时，便形成了一个双极黑子群的活动区。
An active region with a bipolar sunspot is formed when the magnetic flux ring of the sunspot rise to the solar surface from the depth of solar convection zone.
当太阳黑子磁环从太阳对流层深层上浮到太阳表面时，便形成了一个双极黑子群的活动区。
An active region with a bipolar sunspot is formed when the magnetic flux ring of the sunspot rise to the solar surface from the depth of solar convection zone.
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