FCC E3C - 无线电波传播

#E3C01🔗

What is the cause of short-term radio blackouts?

无线电短暂停电的原因是什么？

Coronal mass ejections

日冕物质抛射

Sunspots on the solar equator

太阳赤道上的太阳黑子

North-oriented interplanetary magnetic field

北向行星际磁场

Solar flares

太阳耀斑

✓ 正确答案

#E3C02🔗

What is indicated by a rising A-index or K-index?

A指数或K指数上升表明什么？

Increasing disturbance of the geomagnetic field

地磁场扰动增加

✓ 正确答案

Decreasing disturbance of the geomagnetic field

减少地磁场干扰

Higher levels of solar UV radiation

更高水平的太阳紫外线辐射

An increase in the critical frequency

临界频率增加

#E3C03🔗

Which of the following signal paths is most likely to experience high levels of absorption when the A-index or K-index is elevated?

当 A 指数或 K 指数升高时，以下哪条信号路径最有可能经历高水平的吸收？

Transequatorial

跨赤道

Through the auroral oval

穿过极光椭圆形

✓ 正确答案

Sporadic-E

零星-E

NVIS

夜视系统

#E3C04🔗

What does the value of Bz (B sub z) represent?

Bz（B sub z）的值代表什么？

Geomagnetic field stability

地磁场稳定性

Critical frequency for vertical transmissions

垂直传输的临界频率

North - south strength of the interplanetary magnetic field

行星际磁场的南北强度

✓ 正确答案

Duration of long-delayed echoes

长延迟回声的持续时间

#E3C05🔗

What orientation of Bz (B sub z) increases the likelihood that charged particles from the Sun will cause disturbed conditions?

Bz (B sub z) 的哪个方向会增加来自太阳的带电粒子造成干扰条件的可能性？

Southward

向南

✓ 正确答案

Northward

向北

Eastward

向东

Westward

西行

#E3C06🔗

How does the VHF/UHF radio horizon compare to the geographic horizon?

VHF/UHF 无线电地平线与地理地平线相比如何？

It is approximately 15 percent farther

大约远了 15%

✓ 正确答案

It is approximately 20 percent nearer

大约接近 20%

It is approximately 50 percent farther

大约远了 50%

They are approximately the same

它们大致相同

#E3C07🔗

Which of the following indicates the greatest solar flare intensity?

以下哪一项表明太阳耀斑强度最大？

Class A

A级

Class Z

Z级

Class M

M级

Class X

X级

✓ 正确答案

#E3C08🔗

Which of the following is the space-weather term for an extreme geomagnetic storm?

以下哪项是极端地磁风暴的空间天气术语？

✓ 正确答案

#E3C09🔗

What type of data is reported by amateur radio propagation reporting networks?

业余无线电传播报告网络报告什么类型的数据？

Solar flux

太阳通量

Electric field intensity

电场强度

Magnetic declination

磁偏角

Digital - mode and CW signals

数字模式和 CW 信号

✓ 正确答案

#E3C10🔗

What does the 304A solar parameter measure?

304A太阳能参数测量什么？

The ratio of X-ray flux to radio flux, correlated to sunspot number

X 射线通量与射电通量之比，与太阳黑子数相关

UV emissions at 304 angstroms , correlated to the solar flux index

304埃的紫外线发射量，与太阳通量指数相关

✓ 正确答案

The solar wind velocity at an angle of 304 degrees from the solar equator, correlated to geomagnetic storms

与太阳赤道成 304 度角的太阳风速度，与地磁暴相关

The solar emission at 304 GHz, correlated to X-ray flare levels

304 GHz 的太阳辐射，与 X 射线耀斑水平相关

#E3C11🔗

What does VOACAP software model?

VOACAP 软件模型是什么？

AC voltage and impedance

交流电压和阻抗

VHF radio propagation

甚高频无线电传播

HF propagation

高频传播

✓ 正确答案

AC current and impedance

交流电流和阻抗

#E3C12🔗

Which of the following is indicated by a sudden rise in radio background noise across a large portion of the HF spectrum?

大部分 HF 频谱中无线电背景噪声的突然上升表明以下哪项？

A temperature inversion has occurred

出现逆温现象

A coronal mass ejection impact or a solar flare has occurred

发生日冕物质抛射撞击或太阳耀斑

✓ 正确答案

Transequatorial propagation on 6 meters is likely

可能会在 6 米处进行跨赤道传播

Long-path propagation on the higher HF bands is likely

可能会在较高 HF 频段上进行长路径传播

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FCC E3C - 无线电波传播

小节 E3C：无线电波传播