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【题目】联社报道:美国东部时间2005年9月7 13时40分西五区时间,包括美国在内的地球朝向太阳一面的所有地区,高频无线电通讯几乎全部中断。据此回答3~4

【1】造成这一现象的主要原因是

A.地球大气层中的臭氧层空洞扩大使太阳辐射增强

B.太阳耀斑爆发引起地球大气层的电离层扰动

C.太阳黑子增多造成地球磁场紊乱

D.太阳等天体对地球引力加强

【2】此时地球朝向太阳一面的所有地区占全球

A一半 B一大半 C无法计算 D. 小于二分之一

【答案】

【1】B

【2】A

【解析】

试题分析:

【1】据材料可知,高频无线电通讯几乎全部中断,说明是受太阳活动类型中太阳耀斑影响的结果,故B项正确,C项错误;臭氧层空洞会导致到达地面的紫外线增多,故A项错误;太阳的引力在短期内不发生变化,故D项错误。

【2】地球为一个球体,在太阳辐射的照射下,总会有一半朝向太阳,另一半背对太阳,故此时地球朝向太阳一面的所有地区占全球一半,故A项正确,B、C、D项错误。

表现

形式

概念

表现

平均

周期

黑子

太阳表层温度较低的大气区域,看上去颜色暗一些,故称黑子

黑子的大小和多少,反映了太阳活动的强弱。一般黑子愈大、愈多,太阳活动越强

11年

耀斑

太阳黑子活动的区域突然连在一起,释放出大量的能量,这种能量把太阳上相应区域的气体加热到上百万摄氏度,会突然猛烈爆发并有增亮的现象

耀斑的出现与黑子的多少呈正相关,它总是以瞬时爆发为特征

太阳风

太阳表面向外抛出的高能带电粒子流

耀斑爆发后,太阳风的强度迅速增大

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