Revisiting the Sunspot Number
نویسندگان
چکیده
منابع مشابه
Sunspot Number Corrections
Let me try to say things a bit more clearly. Reconstruction of the EUV flux is on solid ground based on the range of the diurnal variation, rY, of the Geomagnetic East Component: The process is described
متن کاملAnalysis of Sunspot Number Fluctuations
Monthly averages of the sunspot number visible on the sun, observed from 1749, Zurich Observatory, and from 1848 other observatories, have been analyzed. This time signal presents a frequency power spectra with a clear 1/f behavior with α ≃ 0.8±0.2. The well known cycle of approximately 11 years, clearly present in the spectrum, does not produce a sensible distortion of that behavior. The event...
متن کاملThe Differences in the Relationship between Ionospheric Critical Frequencies and Sunspot Number for Different Sunspot Cycles
Analysis of data for Washington and Watheroo indicates differences in the relationship between føF2 and sunspot number for the current and preceding sunspot cycles. The sunspot number is therefore not entirely satisfactory as an index for ionospheric variations. Consequently, ionospheric data for the current cycle only should be used in preparing ionospheric radio propagation predictions whenev...
متن کاملHow Well Do We Know the Sunspot Number?
We show that only two adjustments are necessary to harmonize the Group Sunspot Number with the Zürich Sunspot Number. The latter being inflated from the 1940s on to the present by 20% due to weighting of sunspot counts according to size of the spots, and corrected by inflating the earlier values as well. The Group Sunspot Number before ∼1885 is too low by ∼50%. With these adjustments a single s...
متن کاملDoes sunspot number calibration by the ‘‘magnetic needle’’ make sense?
(so-called rY values). The suggested ‘‘correction’’ method makes an a priori detrending of the rY series and then extends the linear regression between rY and sunspot numbers established for the last 25 years to earlier times. The suggested ‘‘correction’’ of sunspot numbers by roughly 30% goes far beyond the traditional estimates of observational uncertainties of sunspots. Concentrating here on...
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ژورنال
عنوان ژورنال: Space Science Reviews
سال: 2014
ISSN: 0038-6308,1572-9672
DOI: 10.1007/s11214-014-0074-2