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.
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
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.
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
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).