FCC G3A - 无线电波传播

#G3A01🔗

How does a higher sunspot number affect HF propagation?

较高的太阳黑子数量如何影响高频传播？

Higher sunspot numbers generally indicate a greater probability of good propagation at higher frequencies

太阳黑子数量越高，通常表明在更高频率下良好传播的可能性越大

✓ 正确答案

Lower sunspot numbers generally indicate greater probability of sporadic E propagation

太阳黑子数量越少，通常表明偶发 E 传播的可能性越大

A zero sunspot number indicates that radio propagation is not possible on any band

太阳黑子数为零表示无线电传播在任何频段都是不可能的

A zero sunspot number indicates undisturbed conditions

太阳黑子数为零表示未受干扰的情况

#G3A02🔗

What effect does a sudden ionospheric disturbance have on the daytime ionospheric propagation?

突然的电离层扰动对白天电离层传播有何影响？

It enhances propagation on all HF frequencies

它增强了所有高频频率的传播

It disrupts signals on lower frequencies more than those on higher frequencies

它对低频信号的干扰比对高频信号的干扰更大

✓ 正确答案

It disrupts communications via satellite more than direct communications

它对卫星通信的干扰比直接通信更大

None, because only areas on the night side of the Earth are affected

没有，因为只有地球夜间的区域受到影响

#G3A03🔗

Approximately how long does it take the increased ultraviolet and X-ray radiation from a solar flare to affect radio propagation on Earth?

太阳耀斑增加的紫外线和 X 射线辐射大约需要多长时间才能影响地球上的无线电传播？

28 days

28天

1 to 2 hours

1至2小时

8 minutes

8分钟

✓ 正确答案

20 to 40 hours

20至40小时

#G3A04🔗

Which of the following are the least reliable bands for long-distance communications during periods of low solar activity?

在太阳活动低迷时期，以下哪些频段对于长距离通信来说是最不可靠的？

80 meters and 160 meters

80米和160米

60 meters and 40 meters

60米和40米

30 meters and 20 meters

30米和20米

15 meters, 12 meters, and 10 meters

15米、12米、10米

✓ 正确答案

#G3A05🔗

What is the solar flux index?

什么是太阳通量指数？

A measure of the highest frequency that is useful for ionospheric propagation between two points on Earth

对地球上两点之间的电离层传播有用的最高频率的测量

A count of sunspots that is adjusted for solar emissions

根据太阳辐射调整的太阳黑子计数

Another name for the American sunspot number

美国太阳黑子数的另一个名称

A measure of solar radiation with a wavelength of 10 . 7 centimeters

波长为 10 的太阳辐射的测量。 7厘米

✓ 正确答案

#G3A06🔗

What is a geomagnetic storm?

什么是地磁风暴？

A sudden drop in the solar flux index

太阳通量指数突然下降

A thunderstorm that affects radio propagation

影响无线电传播的雷暴

Ripples in the geomagnetic force

地磁力的涟漪

A temporary disturbance in Earth ’s geomagnetic field

地球地磁场的暂时扰动

✓ 正确答案

#G3A07🔗

At what point in the solar cycle does the 20-meter band usually support worldwide propagation during daylight hours?

20 米波段通常在太阳周期的哪个点支持白天的全球传播？

At the summer solstice

夏至之际

Only at the maximum point

仅在最大点

Only at the minimum point

仅在最低点

At any point

在任何时候

✓ 正确答案

#G3A08🔗

How can a geomagnetic storm affect HF propagation?

地磁风暴如何影响高频传播？

Improve high-latitude HF propagation

改善高纬度高频传播

Degrade ground wave propagation

降低地波传播

Improve ground wave propagation

改善地波传播

Degrade high-latitude HF propagation

降低高纬度高频传播

✓ 正确答案

#G3A09🔗

How can high geomagnetic activity benefit radio communications?

高地磁活动如何有利于无线电通信？

Creates auroras that can reflect VHF signals

创建可以反射甚高频信号的极光

✓ 正确答案

Increases signal strength for HF signals passing through the polar regions

增加穿过极地地区的高频信号的信号强度

Improve HF long path propagation

改善高频长路径传播

Reduce long delayed echoes

减少长延迟回声

#G3A10🔗

What causes HF propagation conditions to vary periodically in a 26- to 28-day cycle?

是什么导致高频传播条件在 26 至 28 天的周期内周期性变化？

Long term oscillations in the upper atmosphere

高层大气的长期振荡

Cyclic variation in Earth’s radiation belts

地球辐射带的周期性变化

Rotation of the Sun ’s surface layers around its axis

太阳表面层绕其轴的旋转

✓ 正确答案

The position of the Moon in its orbit

月球在其轨道上的位置

#G3A11🔗

How long does it take a coronal mass ejection to affect radio propagation on Earth?

日冕物质抛射需要多长时间才能影响地球上的无线电传播？

28 days

28天

14 days

14天

4 to 8 minutes

4至8分钟

15 hours to several days

15小时至数天

✓ 正确答案

#G3A12🔗

What does the K-index measure?

K指数衡量什么？

The relative position of sunspots on the surface of the Sun

太阳表面上黑子的相对位置

The short-term stability of Earth ’s geomagnetic field

地球地磁场的短期稳定性

✓ 正确答案

The short-term stability of the Sun’s magnetic field

太阳磁场的短期稳定性

The solar radio flux at Boulder, Colorado

科罗拉多州博尔德的太阳射电通量

#G3A13🔗

What does the A-index measure?

A指数衡量什么？

The relative position of sunspots on the surface of the Sun

太阳表面上黑子的相对位置

The amount of polarization of the Sun’s electric field

太阳电场的极化量

The long - term stability of Earth ’s geomagnetic field

地球地磁场的长期稳定性

✓ 正确答案

The solar radio flux at Boulder, Colorado

科罗拉多州博尔德的太阳射电通量

#G3A14🔗

How is long distance radio communication usually affected by the charged particles that reach Earth from solar coronal holes?

从太阳日冕洞到达地球的带电粒子通常如何影响长距离无线电通信？

HF communication is improved

高频通信得到改善

HF communication is disturbed

高频通讯受到干扰

✓ 正确答案

VHF/UHF ducting is improved

VHF/UHF 管道得到改善

VHF/UHF ducting is disturbed

VHF/UHF 管道受到干扰

← 上一节: G2E 📑 返回 G3 大纲下一节: G3B →

FCC G3A - 无线电波传播

小节 G3A：无线电波传播