雷を撮影 Recorded the lightning
今年の夏は異様に長い…。最高気温30℃を超える日が年々長くなっている気がします。
This summer is unusually long… It feels like the number of days with temperatures exceeding 30°C is increasing year by year.
日中暑いと発生することが多い雷。雷が怖い人は一定数いると思いますが、私、雷を見るのが好きなんですね。全く怖くないというわけではないんですが、それよりも夜空に現れる変幻自在な光のショーに魅せられて何時間も見てしまうこともしばしば。
Lightning often occurs when it is hot during the day. I think there are a certain number of people who are afraid of lightning, but I actually like watching lightning. It’s not that I’m not scared at all, but I’m often fascinated by the ever-changing light show in the night sky, and I end up watching it for hours.
少し前に撮影できた雷の動画を短く切り取ってみたので、載せてみます。
I tried cutting a short clip from a video of lightning I was able to capture a little while ago, so I’ll post it here.
一番すごかったのがコレ↓ The most impressive one was this ↓
雷が発生する仕組み The Mechanism of Lightning
音羽電機工業株式会社のHPにわかりやすい図がありました。
There is an easy-to-understand diagram on the website of Otowa Electric Co., Ltd.
- 日射などで空気が暖められ水蒸気を含んだ上昇気流が発生
The air is warmed by the sun’s rays, creating an updraft containing water vapor. - 上空の冷たい空気により水蒸気が水滴に、さらに氷の粒になる
Water vapor turns into water droplets and then further into ice particles due to the cold air at higher altitudes. - 氷の粒が大きくなると重力で落ち始め、粒同士の摩擦により帯電（雷雲上部と地面は＋、雷雲下部は－）
When the ice particles grow larger, they begin to fall due to gravity, and they become charged through friction with each other (the upper part of the thundercloud and the ground become positively charged, while the lower part becomes negatively charged). - －と＋間の電位差が大きくなると空気中に電流が発生（地面に落ちるのが「落雷」、雷雲内や雷雲間で発生するのが「雲放電」）
When the potential difference between the negative and positive charges becomes significant, it generates an electrical current in the air (resulting in “lightning strikes” to the ground and “cloud discharges” occurring within or between thunderclouds).
今回撮影できたのは雲放電ですね。撮影できていない時に落雷もありましたが、ほとんどは雲放電です。雷が鳴り始めても経験上それほど落雷することはないと思いますので、慌てずに安全な場所に避難しましょう。車や建物の中ならば基本的に安全です。
What I captured this time were cloud discharge. While there were lightning strikes that I couldn’t capture, most of them were cloud discharges. In my experience, when thunder starts, there usually aren’t many lightning strikes, so it’s important to stay calm and seek in a safe place. Being inside a car or a building is generally safe.
でも子供の頃、ベランダで雷を見てたら目の前に落雷したことがありました。目の前が真っ白になったと思ったら、直後におそらく網膜に焼き付いた残光？で雷が通った軌跡が赤く見えた記憶があります。そしてとてつもない雷鳴！（空気が電流によって急激に熱せられ膨張する音）音圧でガラス戸が大きく震え割れるかと思いました。びっくりしすぎて逆に声も出ず口を開けて固まってました（笑）
When I was a child, I once witnessed lightning striking right in front of me while I was on the balcony. I remember that the area in front of me turned completely white, and then shortly after, there was probably an afterimage burned into my retina, and I saw a red streak where the lightning had passed. And a tremendous thunderclap! (The sound of the air rapidly heating and expanding due to the electrical current.) The sound pressure made the glass door shake so much that I thought it might shatter. I was so surprised that I couldn’t say a word and was frozen with my mouth open.
それ以来、なるべく窓は閉めて観察しております（笑）
Since then, I have been keeping the windows closed as much as possible while observing.
花火もいいですが、雷は自然の創り出した花火。風物詩として楽しんでおります。
Fireworks are great, but lightning is nature’s own fireworks. I enjoy it as a natural spectacle.
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