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发表于 2024-3-25 18:25
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SEVERE GEOMAGNETIC STORM--THE STRONGEST IN YEARS: As predicted, a CME struck Earth's magnetic field on March 24th (1437 UT). The impact opened a crack in our planet's magnetosphere and sparked a severe G4-class geomagnetic storm--the strongest geomagnetic storm since Sept. 2017.
The timing of the CME did *not* favor observers in Europe or the United States. Instead, New Zealand got the light show:
"I woke up early and, when I saw that a storm was underway, jumped out of bed and raced to my favourite viewing spot at Hoopers Inlet," says photographer Ian Griffin. "The beautiful aurora australis was easily visible despite clouds and bright moonlight."
In England, it was broad daylight when the CME struck. Auroras could not be seen. Nevertheless, Stuart Green of Preston, England detected the storm using his backyard magnetometer:
"My magnetometer kicked into life mid-afternoon here in the UK," says Green. "The arrival of the CME created a severe disturbance."
The squiggles in Green's chart represent changes in ground-level magnetic fields caused by the CME. "The sensor is buried in my garden about 0.5 meters below the surface in an East/West orientation," he explains. "This allows very sensitive (sub nanotesla) measurements of magnetic declination during geomagnetic storms."
严重的地磁风暴——多年来最强的:正如预测的那样，CME在3月24日(1437世界时)袭击了地球磁场。这次撞击在地球的磁层上打开了一条裂缝，引发了一场严重的g4级地磁风暴——这是自2017年9月以来最强的地磁风暴。
CME的时机对欧洲或美国的观察人士不利。相反，新西兰得到了灯光秀:
摄影师伊恩·格里芬说:“我起得很早，当我看到暴风雨就要来的时候，我从床上跳起来，跑到我最喜欢的霍普斯湾观景点。”“尽管有云，月光皎洁，美丽的南极光还是很容易看到。”
在英国，日冕物质抛射发生时正值大白天。极光看不见了。尽管如此，英国普雷斯顿的斯图尔特·格林还是用自家后院的磁力计探测到了这场风暴:
格林说:“在英国，我的磁力计在下午三点左右开始工作。”“日冕物质抛射的到来造成了严重的扰动。”
格林图表上的曲线表示由日冕物质抛射引起的地面磁场变化。他解释说:“传感器被埋在我的花园中，在地表以下0.5米左右，呈东西方向。”“这可以在地磁风暴期间非常敏感地(亚纳特斯拉)测量磁偏角。”
来自：spaceweather.com
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发表于 2024-3-24 18:10
