This paper reports, for the “first time,” the delayed response of O~1D 630.0 nm dayglow emissions over Trivandrum (8.5°N, 77°E, 0.5°N dip lat.), a geomagnetic dip equatorial station in India, to the noontime X-class solar flare event of July 30, 2005. The dayglow measurements were made using a unique dayglow photometer operating at three wavelengths. The Equatorial Electrojet induced magnetic field, measured using a proton precession magnetometer, showed a magnetic spike having ～90 nT enhancement during this flare with a time delay of ～7.2 min. A noteworthy observation is that unlike to the conventional belief, the O~1D 630.0 nm dayglow over the dip equator exhibited a fourfold enhancement during the noontime flare after a time delay of ～45 min. Analysis of satellite measured electron density and modeling simulations indicate that the thermospheric O~1D 630.0 nm dayglow emission over the dip equatorial region during a solar flare is primarily driven by the electrodynamics, rather than the direct solar control. This finding is new, unique and very important for the studies related to plasma-neutral coupling and also for modeling studies on the equatorial thermosphere-ionosphere region is concerned.
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机译：本文报道,“第一次”延迟反应的O ~ 1 d 630.0 nm dayglow排放在特里凡得琅(8.5°N, 77°E, 0.5°N倾斜lat),一个地磁赤道站印度,中午x级太阳耀斑事件2005年7月30日。使用一个独特的dayglow光度计操作三波长。感应磁场,测量使用一个质子旋进磁力仪,磁道钉~ 90元增强在这光晕~ 7.2分钟的时间延迟,一个值得注意的观察是,与传统的信念,O ~ 1 d 630.0 nm dayglow倾斜赤道增强四倍在展出后中午耀斑~ 45分钟的时间延迟。分析卫星测量电子密度和建模仿真表明,thermospheric O ~ 1 d 630.0 nm dayglow发射在太阳耀斑是浸赤道地区主要由电动力学,而太阳能直接控制。新的,独特的和非常重要的研究和相关plasma-neutral耦合在赤道建模研究thermosphere-ionosphere地区而言。
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