新年極光和搜尋救援弧線
A New Year's Aurora and SAR Arc
來源：Alessandra Masi｜發表日期：2025-01-07
新年新氣象，天空倍加紅。 新的一年意味著地球在 1 月 1 日回到了它在軌道上的慣常位置，也就是它最接近太陽的前幾天。 左邊兩道紅霞中的第一道是紅色極光，帶有垂直射線，是太陽爆炸將帶電粒子推入地球大氣層造成的。 第二道紅光在最右邊最為突出，可能是帶電粒子河流經地球大氣層造成的特區弧。 雖然兩者都呈現紅色，但顏色上的細微差別可能是由於極光是由氧氣和氮氣同時發出的，而較高的 SAR 弧可能更純粹是由大氣中的氧氣發出的。這張照片是 1 月 1 日在義大利 Pieve di Cadore 附近拍攝的。 宇宙之門隨機 APOD 生成器
原文：It was a new year, and the sky was doubly red. The new year meant that the Earth had returned to its usual place in its orbit on January 1, a place a few days before its closest approach to the Sun. The first of the two red skyglows, on the left, was a red aurora, complete with vertical rays, caused by a blast from the Sun pushing charged particles into Earth's atmosphere. The second red glow, most prominent on the far right, was possibly a SAR arc caused by a river of charged particles flowing across Earth's atmosphere. Although both appear red, the slight color difference is likely due to the aurora being emitted by both oxygen and nitrogen, whereas the higher SAR arc was possibly emitted more purely by atmospheric oxygen. The featured image was taken on January 1 from near Pieve di Cadore in Italy. Portal Universe: Random APOD Generator
※ 本文由萌芽機器人自動轉貼自每日一天文圖（Astronomy Picture of the Day，APOD），原文為英文，正體中文是透過 DeepL 翻譯及 OpenCC 進行自動處理，內容僅供參考，若有任何錯誤之處還請見諒！
關於每日一天文圖：每日一天文圖網站是美國國家航空暨太空總署與密西根理工大學提供的服務，網站每天提供一張影像或圖片，並由天文學家撰寫扼要說明其特別之處。