From what little information is available on Coronal Mass Ejections, It seems that initially a powerful light flash will be seen on earth. Isaiah 30:26 The electro-magnetic effect of this causes earthquakes and electrical system meltdown, then the main mass of super heated, highly charged hydrogen plasma arrives 18-36 hours later. This plasma affects the earth for one day, as it rotates, depending on the size of the ejection. Then the CME carries on into outer space. These Bible prophecies tell of that period between the light flash and the main strike:
Jeremiah 6:24-26 News of them [the coming disaster] has reached us and our hands hang limp, agony grips us, like a woman in labour. Do not go outside for terror is spread all around. In an instant, the despoiler is upon us.
Jeremiah 30:6-7 Every man grips his sides and every face turns pale. How awful is that Day. It is a time of trouble for the descendants of Jacob, but some will be rescued out of it.
Ezekiel 7:17 Every hand hangs limp, fright will cause their knees to be wet with urine.
Ezekiel 21:5-7a All shall know that I, the Lord has drawn My sword…. groan bitterly until you collapse. All hearts will melt, all hands hang limp, all courage will fail.
Zephaniah 3:14-16 Zion: cry out for joy – the Lord has swept away your enemies. On that Day, this is the message for Jerusalem; fear not, let not your hands hang limp.
Signs in the heavens just before the Day of the Lord’s vengeance and wrath;
Joel 2:31 The sun will be turned to darkness and the moon to blood before the coming of the great and terrible Day of the Lord. Luke 21:26
Acts 2:19-20 I will show wonders in the sky and signs on the earth; blood, fire and smoke. The sun will be darkened and the moon blood red, before the Great Day of the Lord.
Isaiah 13:9-13 The Day of the Lord is coming, that cruel Day of wrath and fierce anger, to reduce the earth to a desolation and to destroy all the wicked there. The sun, moon and stars will give no light. Humans will become scarce, as rare as fine gold and the earth will quake at the wrath of God on the Day of His blazing anger. Ezekiel 21:7b, Isaiah 30:26-28
Ezekiel 32:7-8 When I judge you [Egypt] I shall veil the sky and darken the sun with clouds, the moon will give no light. Darkness will cover your land.
Isaiah 24:21-23 On that Day, the Lord will punish in heaven, the host of heaven and on earth, the kings of the earth. The moon will grow pale and the sun will be darkened.
Joel 2:10 At their onset [the ‘vast host’] the earth shakes and the heavens shudder. The sun and moon are darkened and the stars give no light.
Isaiah 34:4 The heavens will roll up like a scroll, their host will fall like ripe fruit. [our satellites]
Revelation 6:12-14 – The Sixth Seal; There was a great earthquake and the sun turned black as a funeral pall and the moon blood red, the starry host fell and the sky rolled up like a scroll.
Signs of the Return of Jesus – a much different and years later event from the Day of the Lord’s vengeance and wrath;
Matthew 24:29-30. As soon as that time of distress [the Great Tribulation] has passed, the sun will be darkened, the moon will not give her light, stars will fall [meteors] and the heavenly power will be shaken…then all will see Him coming on the clouds.
Reference: REB. some verses abridged.
The sun will be darkened at the Return; referred to as the Great Day of the Sovereign Lord, Rev. 16:14 – this is to highlight that event. That darkening is not the same as what is described at the much earlier, soon to happen, Lords Day of vengeance and wrath. This will be because an enormous mass is approaching, obscuring the sun and then, when it hits, by the smoke from the fires and volcanoes. The moon will shine blood red from a thermite reaction with the moon dust.
That the Lord has in the past and will again in the future cause a ‘darkening’, other than a CME, is shown by Exodus 10:21-22, Luke 23:44-45, Revelation 16:10.
It is not correct to say there is only one Day of the Lord.