摘要
本文介绍了高空间分辨率的太阳射电观测流量的归算方法，即对观测的太阳天线温度值作天线功率方向图Ｋ因子的修正，即可得到太阳射电流量值．文中推导了不同温度分布模型下的Ｋ因子表达式，并计算了日面宁静太阳流量值和部分射电源的ＳＶＣ辐射流量值．对日面宁静区的射电辐射而言，因Ｋ的年变化（０．０２３６—０．０２５２）不大，因此按其平均值０．０２４４可计算出２２ＧＨｚ频率上宁静太阳流量ｓ。＝０．１５Ｔａ。（以ｓｆｕ为单位，Ｔａ。是宁静区辐射的太阳天线温度），相应的宁静太阳温度为１０１００土３００Ｋ．１９９０年７月２日源区的ＳＶＣ辐射计算结果表明：日面源区的ＳＶＣ辐射总和为２０ｓｆｕ，约占日面总辐射的２．４％．
In this paper we presented reduction method of solar radio emission flux at 22GHz with a resolution of 4'.According to observed solar antenna tempera-tures,we make a correction for Kfactor of antenna power pattern,then we can Obtain ValueS Of SOlar radio fluX.In addition,according to models of different temperature distributions of the quiet sun and radio sources,we deduced the expression of the K factor of anten-na power pattern,and calculated the.fluxes of the quiet sun and SVC emission ofradio sources.For radio emission of quiet sun and no source regions,because annual varia-tion of the K factor Is very litte(varying area of the K factor is 0.0236一0.0252 in a year),according to mean value(0.0244)of the K factor we obtain flux and brightness temperature of the quiet sun emission.For quiet sun or no source regions away from source,the conversion factor between antenna tern-erature(Ta.)and fluxes( S.)is 0.15,that is S=0.15 Ta.The brightness temperature of the quiet sun is 10100±300K at 22GHz.On Juny 2,1990 the sum of the SVC emission fluxes of radio sources on the solar disk is 20sfu,which is about 2.4% of total radio emission from the solar disk at 22 GHz.
出处
《天文学报》
CSCD
北大核心
1996年第1期60-67,共8页
Acta Astronomica Sinica
基金
国家
江苏省和中科院天文委员会基金
