龍潭 太陽閃燄電波20MHz間接

今年(2000年)的6月,進入炎熱的夏天時分,也正值太陽黑子等活動周期的高蜂.太陽放出的大量高能帶電離子在這兩年非常時常侵襲著地球的大氣層和電離層 .導至極地的極光也異常燦爛.

由於太陽發出的無線電雖然可含蓋低,中,高及超高頻(如太陽黑子的頻率在2.8GHz).但實際的觀測要依地球電離層反射無線電電離濃度,頻率和反射角度,太陽活動和白天或晚上的狀況而定 .本站自流星電波觀測狀況穩定後 ,便積極對太陽表面爆炸的高能電磁波中的全頻無線電波觀測有極大興趣,但由於超高頻2.8GHz本身需要低損失導波管,降頻器和前置放大等國內不易獲得的管制零件(此頻率並非商用頻率),同時要能全天追縱太陽的二維驅動或赤道儀架台裝置碟型天線,這一切並非業餘和財力單薄的站長所能購負擔的起.

所以,以間接觀測太陽的方式,利用HF 頻道來觀測電離層變化,同時天線為固定式的20MHzDiple,此電離層在白天受太陽影響,而隨時改變HF無線電的反射傳導.利用這些微小變化太陽能量,進而了解太陽的表面活動變化.

另外設計及自製一個專門觀測地球磁場微細變化的地磁儀,若太陽產生太陽風,約一天後可到達並進入地球磁場.此時地磁南北極會有少量變化,利用地磁儀可以觀測因太陽風引起的地磁變化,可以和地球電離層因太陽x光和紫外線引起D層自由電子/空氣正離子變化的數據(電波數據)作比對.

The solar burst of observation is still my favorite recently.As we know, although the solar radio had wide band of range. but we had to set the GHz received equipment and tailed th sun movement in the sky.In Taiwan,the 2.8GHz of receiver and downconverter devices are very hard to get and the expense is very high too.That is why I use the indirect observation of method to get the solar burst radio data.All we know,the Earth of ionization layer could be generated ,the main source of power all come from solar x ray and high energetic ultraviolet.when the solar bursted, a large number of x ray and high energetic freedom electrons will invade the earth atmosphere and affect the radio of communication after 8 minutes...

If we listen to radio of HF band or SW, the signal will be interfere and fedeout.that is because of D layer be saturated of electric charge,caused the HF band couldn't pass through the D layer (HF band be absorbed,it should be reflected by higher F2 layer normally).Opposite,if we choose a frequency which have no sation there,sometime we could find there is some voice from this frequency...so we could detec the radio conduction or propagation changed by high sensitive antenna and receiver.

In July ,I set a simple device to receive 20MHz AM signal and analysed the wave strength,I build my first solar radio observatory and made some deteced circuit and some methods to get better effect.at the same time ,I compared the datas between my receiving data and x ray real time data(it is from GEOS U.S weather satellite).


20MHz band水平 Diple天線

白天專門接收受太陽爆發後,引起地球電離層D/F Layer

自由電子濃度變化,此時0.1-22MHz的無線電反射狀況會隨其

電離濃度改變而隨時變化 .

利用高感度天線和接收機將其音頻變化轉成直流電壓輸出,

利用電腦轉成數位訊號後,紀錄成數據和曲線紀錄.

本天線位於龍潭流星電波觀測站屋頂.

日本第一無線製.原為21MHz頻率為共振中心,修改20.5MHz

為主.採水平式和50 歐姆饋線.

The 20MHz of band antenna: It is for receiving ionization layer of reflection by solar burst.As the reason,the HF band of receiving situation could be changed by time.

We could use the high sensitive antenna and HF receiver to get the tiny and weak signal of far radio station during the all daytime.Example ,we use the 20MHz of frequency to receive the signal like that and use voice/voltage transferring circuit for computer recording.


間接觀測太陽閃燄的接收機和處理裝置:

利用音頻/直流電壓轉換電路和數位三用電表改裝成電離層無線

電背景強度輸出,此訊號以數位轉換至一部586 PC上.並以數字和曲線兩

種記錄方式以電腦儲存和顯示,此數據亦可轉成供Lotus 1,2,3 for Win97處

理的數據格式.

We used a voice/voltage transferring circuit to transfer the weak signal into computer for displaying the curve of changed by time .All process was by a 586 computer and saved the datas.

We let the HF radio could be received with the all band sw receiver.the highly sensitive radio had FM,AM,SSB and SW mode of receiving (Taiwan made)


上圖為9月30日至10月1日在龍潭觀測站所觀測到的20.1MHz電波在電離層D層和F2層的強度變化(反射變化)圖.和美國的GOES氣像衛星即時X光(1.0-8.0 nm波長)所得到的能量變化發生時間均吻合(圖中1-7的的peak curve 所發生的時間相同).

This curve of background noise of strength was from 20.1MHz AM band (D layer of reflection changed by time).we compared with x ray's curve of real time from GOES weather satellite.

We could find the almost of all peaks of curves were the same position of time/date between 20MHz noise curve and x ray from GOES.(example:number 1,2...7 of small circles from the above figure).

下圖為美國GOES同步衛星每天的太陽X光不同波長強度數據.(本圖為UT時間).

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