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                    作文網,小學生作文,初中作文,高中作文,作文題材大全!

                    日全食發生的原理、影響及過程

                    編輯:作文網 | 來源:時事論據

                     日全食發生的原理

                    發生日環食是因為太陽靠近月球軌道與地球軌道的的一個交點,而同時月球在距此點的最遠的點上。食既從初虧開始,就是偏食階段了。月亮繼續往東運行,太陽圓面被月亮遮掩的部分逐漸增大,陽光的強度與熱度顯著下降。當月面的東邊緣與日面的東邊緣相內切時,稱為食既。此時整個太陽圓面被遮住,因此,食既也就是日全食開始的時刻。

                    之所以會發生日全食,是因為存在一種神奇的對稱性。太陽的直徑是月亮的400倍,而它距地球的距離正好也是月亮的400倍。結果,當月亮完全處于地球和太陽之間時,對那些完全處于月亮陰影中的人來說,太陽的表面便被完全遮擋了。太陽變成了黑色,只留下一個金色的光環,天空變成了靛青色。鳥兒此時會失去方向,或者會飛回巢中,蝙蝠和其它夜行動物則可能睡眼惺忪地出來活動。

                    日食發生時的影響及現象

                    發生日全食時,光線穿過樹葉的縫隙投影出新月的影子。發生日全食時,動物常常準備睡覺,或行為異常。發生日全食時,當地的溫度通常會下降至少20度以上。當99%的太陽表面被覆蓋時,能看到的晨昏蒙影現象。在日全食期間,地平線的周圍會有一個窄的光帶,這是因為觀察者并不是直接站在月亮的影子下面,地球和月亮有一定的距離。在現代的原子鐘出現之前,天文學家通過對日食的古代記錄進行研究,發現地球旋轉的周期每個世紀變慢了0。001秒。

                    日全食過程

                    日食過程

                    一次日全食的過程可以包括以下五個時期:初虧、食既、食甚、生光、復圓。

                    初虧

                    由于月亮自西向東繞地球運轉,所以日食總是在太陽圓面的西邊緣開始的。當月亮的東邊緣剛接觸到太陽圓面的瞬間(即月面的東邊緣與日面的西邊緣相外切的時刻),稱為初虧。初虧也就是日食過程開始的時刻。

                    食既

                    從初虧開始,就是偏食階段了。月亮繼續往東運行,太陽圓面被月亮遮掩的部分逐漸增大,陽光的強度與熱度顯著下降。當月面的東邊緣與日面的東邊緣相內切時,稱為食既。此時整個太陽圓面被遮住,因此,食既也就是日全食開始的時刻。

                    食甚

                    食既以后,月輪繼續東移,當月輪中心和日面中心相距最近時,就達到食甚。

                    生光

                    對日偏食來說,食甚是太陽被月亮遮去最多的時刻。月亮繼續往東移動,當月面的西邊緣和日面的西邊緣相內切的瞬間,稱為生光,它是日全食結束的時刻。在生光將發生之前,鉆石環、貝利珠的現象又會出現在太陽的西邊緣,但也是很快就會消失。接著在太陽西邊緣又射出一線刺眼的光芒,原來在日全食時可以看到的色球層、日珥、日冕等現象迅即隱沒在陽光之中,星星也消失了,陽光重新普照大地。

                    復圓

                    生光之后,月面繼續移離日面,太陽被遮蔽的部分逐漸減少,當月面的西邊緣與日面的東邊緣相切的剎那,稱為復圓。這時太陽又呈現出圓盤形狀,整個日全食過程就宣告結束了。

                    貝利珠/鉆石環

                    在太陽將要被月亮完全擋住時,在日面的東邊緣會突然出現一弧像鉆石似的光芒,好像鉆石戒指上引人注目的閃耀光芒,這就是鉆石環(DiamondRing),同時在瞬間形成為一串發光的亮點,像一串光輝奪目的珍珠高高地懸掛在漆黑的天空中,這種現象叫做珍珠食,英國天文學家貝利最早描述了這種現象,因此又稱為貝利珠(BailyBeads)。這是由于月球表面有許多崎嶇不平的山峰,當陽光照射到月球邊緣時,就形成了貝利珠現象。貝利珠出現的時間很短,通常只有一二秒鐘,緊接著太陽光就全部被遮蓋住而發生日全食了。

                    食分

                    用來表示日食的程度。對于日食而言,食分并不表示太陽圓面被遮俺的面積,而是表示日面直徑的被遮部分與太陽直徑的比值。以太陽的直徑作為1,如果食分為0.5,這就表示太陽的直徑被遮去了一半;如果食分為1,那就是太陽的整個圓面被遮住,那就是日全食。很顯然,食分越大,日面被遮掩的程度就越大。日偏食的食分是小于1.0的,日全食的食分是1。0。

                    食帶

                    由于月亮的影錐又細又長,所以當它落到地球表面時,所占的面積很小,至多不會超過地球總面積的萬分之一,它的直徑最大也只有二百六十多千米。當月球繞地球轉動時,影錐就在地面上自西向東掃過一段比較長的地帶,在月影掃過的地帶,就都可以看見日食。所以這條帶就叫做“日食帶”。帶內發生日全食的,就叫全食帶;帶內發生日環食的,就叫環食帶。可以看到偏食的范圍很廣闊,已經不像一條帶子,而是很大的一片地區。

                    全食帶是一條寬度不過二三百千米,長約數千到10000千米的狹窄路徑(有時全食帶的寬度甚至只有幾千米),只有在全食帶掃過的地區才能看見日全食或日環食的發生。全食帶的兩旁是較廣闊的半影掃過的地區,在這些地區內可見偏食。離全食帶愈近的偏食區,所見偏食程度愈大;離帶愈遠,可見偏食程度愈小;半影區以外的地方是看不見日食的。

                    由于月球是由西向東運行,所以它的影子也是沿同一方向運行,因此各地看到日食的時間是不同的。當地面上的西部地區已經處在黑影區域內,這一地區的人已經看到日食時,東部地區的人卻不能同時看到日食,得在月影向東移來后才能看到日食。所以,西部地區的人總是比東部地區的人先看到日食。

                    日食每年都有發生,但由于全食帶是一條狹窄的影帶,據估計,平均每200~300年,某一地區或城市才有機會被全食帶掃過,所以,對住在一個城市的人來說,一生可能未看到過一次日全食。

                    日食持續時間

                    日食的時間長短,同月球影錐在地面上移動的速度以及地球的自轉方向有關。以日全食來說,由于月球的視直徑僅略大于太陽,同時月影在地面移動速度很快,因此日全食的時間是很短暫的。在全食帶的某個地點所看到的日全食時間通常只有兩三分鐘,最多不超過7分鐘。如果全食帶經過赤道附近地區,日全食時間就可延續到7分40秒,這時是觀測日全食的最好機會。

                    在發生日環食時,月亮總是位于遠地點附近,這時月亮運行的速度較慢,因此日環食的時間比較長,如果日環食發生在赤道附近,那么在赤道附近觀測日環食的時間可長達12分42秒。

                    就全球范圍來說,如果把月亮半影開始遮掩日面的時間計算在內,日食時間的長度由初虧至復圓的整個過程可長達三個半小時。

                    日偏食的時候,由于月影范圍大于其本影,食相經過的時間長短要視食分的大小而定,食分愈大,時間也就愈長。
                     

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