What does the 304A solar parameter measure?
The correct answer is B: UV emissions at 304 angstroms, correlated to the solar flux index. What does the 304A solar parameter measure is UV emissions at 304 angstroms, correlated to the solar flux index. 304A measures UV at 304 angstroms wavelength. For amateur radio operators, this is important for understanding solar parameters. Understanding this helps when evaluating solar activity.
Exam Tip
304A solar parameter = UV emissions at 304 angstroms, correlated to solar flux index. Think '3'04A = '3'04 'A'ngstroms UV. 304A measures UV at 304 angstroms wavelength. Not X-ray/radio ratio, not wind velocity, not 304 GHz - just UV at 304 angstroms.
Memory Aid
"304A solar parameter = UV emissions at 304 angstroms, correlated to solar flux index. Think '3'04A = '3'04 'A'ngstroms. 304A measures UV at 304 angstroms wavelength. Important for understanding solar parameters."
Real-World Application
The 304A solar parameter: It measures UV emissions at 304 angstroms (30.4 nm), which is correlated to the solar flux index. This UV measurement provides information about solar activity. This is what 304A measures - UV emissions at 304 angstroms, correlated to solar flux index.
Key Concepts
Why Other Options Are Wrong
Option A: Incorrect. Ratio of X-ray flux to radio flux isn't 304A - 304A is UV at 304 angstroms. X-ray/radio ratio isn't 304A.
Option C: Incorrect. Solar wind velocity at 304 degrees isn't 304A - 304A is UV at 304 angstroms wavelength. Wind velocity isn't 304A.
Option D: Incorrect. Solar emission at 304 GHz isn't 304A - 304A is UV at 304 angstroms wavelength. 304 GHz isn't 304A.
题目解析
The correct answer is B: UV emissions at 304 angstroms, correlated to the solar flux index. What does the 304A solar parameter measure is UV emissions at 304 angstroms, correlated to the solar flux index. 304A measures UV at 304 angstroms wavelength. For amateur radio operators, this is important for understanding solar parameters. Understanding this helps when evaluating solar activity.
考试技巧
304A solar parameter = UV emissions at 304 angstroms, correlated to solar flux index. Think '3'04A = '3'04 'A'ngstroms UV. 304A measures UV at 304 angstroms wavelength. Not X-ray/radio ratio, not wind velocity, not 304 GHz - just UV at 304 angstroms.
记忆口诀
304A solar parameter = UV emissions at 304 angstroms, correlated to solar flux index. Think '3'04A = '3'04 'A'ngstroms. 304A measures UV at 304 angstroms wavelength. Important for understanding solar parameters.
实际应用示例
The 304A solar parameter: It measures UV emissions at 304 angstroms (30.4 nm), which is correlated to the solar flux index. This UV measurement provides information about solar activity. This is what 304A measures - UV emissions at 304 angstroms, correlated to solar flux index.
错误选项分析
Option A: Incorrect. Ratio of X-ray flux to radio flux isn't 304A - 304A is UV at 304 angstroms. X-ray/radio ratio isn't 304A. Option C: Incorrect. Solar wind velocity at 304 degrees isn't 304A - 304A is UV at 304 angstroms wavelength. Wind velocity isn't 304A. Option D: Incorrect. Solar emission at 304 GHz isn't 304A - 304A is UV at 304 angstroms wavelength. 304 GHz isn't 304A.
知识点
304A solar parameter, UV emissions, 304 angstroms, Correlated to solar flux index
Verified Content
Question from official FCC Extra Class question pool. Explanation reviewed by licensed amateur radio operators.