"Bafo de borboleta" direto do Sol?

Um buraco coronal no Sol, em formato de “borboleta gigante”, lançou vento solar que atingiu a Terra no domingo (14), provocando tempestade geomagnética intensa.

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A abertura solar chegou a 500 mil km de extensão, suficiente para alinhar 40 planetas como a Terra. Esses buracos permitem a fuga de vento solar.

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O impacto causou uma tempestade geomagnética G3, considerada forte. Auroras foram vistas no norte dos EUA e em grande parte do Reino Unido.

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Tempestades G3 podem gerar falhas em satélites, problemas de navegação e arrasto em órbitas baixas, segundo a NOAA.

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A atividade deve diminuir até terça-feira (16), mas condições instáveis ainda podem provocar novas auroras nos próximos dias.

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Esses eventos são mais comuns em semanas próximas aos equinócios, quando os campos magnéticos da Terra e do Sol se alinham.

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O efeito Russell-McPherron explica o aumento: entre 1932 e 2014, tempestades foram duas vezes mais frequentes nessa época do ano.

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Além de riscos para redes elétricas e satélites, as tempestades trazem espetáculos visuais: auroras boreais e austrais colorindo os céus.

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