Questions tagged [sunspots]
Questions about sunspots, how they are measured, what those measurements mean and how they affect amateur radio activity.
7 questions
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Where does the year 2019 fall in the sunspot cycle for HF propagation?
I am reposting this question about the year 2016 here. This is 2019.
Are we now at the good or bad portion of the 11 years cycle?
What effect are we seeing now?
How large (strong/deep) is the effect ...
- 8,174
16
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7
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What is the cause of this unusually long period of terrible HF band conditions?
I've been a ham for over 40 years, but never has there been such a prolonged period of such poor propagation. This has been especially the case over the past six months or so, and they continue to ...
- 8,174
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Where year 2016 falls in the sun spot cycle for HF propagation?
Are we now at the good or bad portion of the 11 years cycle? What effect are we seeing now? How large (strong/deep) is the effect during the peak and bottom of cycle? What will change in coming years?
- 552
4
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Calculating effective SSN (sunspot number)?
I am doing research on how SSN-like parameters affect HF radio signals. As I can see, effective SSN is a parameter that is derived from SSN or using other parameters. Does anyone know how to calculate ...
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How do sunspot numbers (SSN) affect radio operations?
I frequently hear talk about SSNs in Amateur Radio, and somehow if the number is high, that's a good thing. I just don't really understand what they are, and what they mean, and I'd like to better ...
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Why is the solar-flux index measured at 10.7 cm?
Why is the solar-flux index measured at 10.7 cm? What makes that such a special frequency?
- 1,754
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3
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How and why sunspots affect propagation in HF bands?
How and why do sunspots affect propagation in HF bands?
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