Differences in the temporal variations of solar UV flux, 10.7-cm solar radio flux, sunspot number, and Ca-K plage data caused by solar rotation and active region evolution

1983 ◽  
Vol 88 (A12) ◽  
pp. 9883 ◽  
Author(s):  
R. F. Donnelly ◽  
D. F. Heath ◽  
J. L. Lean ◽  
G. J. Rottman
Keyword(s):  
Active Region ◽  
Sunspot Number ◽  
Solar Radio ◽  
Solar Rotation ◽  
Temporal Variations ◽  
Radio Flux ◽  
Solar Radio Flux ◽  
Solar Uv ◽  
Region Evolution

Phase Relationship Between Sunspot Number, Flare Index and Solar Radio Flux

2012 ◽  
Vol 33 (4) ◽  
pp. 387-397 ◽  
Author(s):  
X. L. Yan ◽  
L. H. Deng ◽  
Z. Q. Qu ◽  
C. L. Xu ◽  
D. F. Kong
Keyword(s):  
Sunspot Number ◽  
Solar Radio ◽  
Phase Relationship ◽  
Radio Flux ◽  
Solar Radio Flux ◽  
Flare Index

scholarly journals The 30 cm radio flux as a solar proxy for thermosphere density modelling

2017 ◽  
Vol 7 ◽  
pp. A9 ◽  
Author(s):  
Thierry Dudok de Wit ◽  
Sean Bruinsma
Keyword(s):  
Solar Rotation ◽  
Rotation Period ◽  
Density Variation ◽  
Temperature Model ◽  
Radio Flux ◽  
Model Bias ◽  
Solar Forcing ◽  
Radio Emissions ◽  
Solar Uv ◽  
Density Modelling

The 10.7 cm radio flux (F10.7) is widely used as a proxy for solar UV forcing of the upper atmosphere. However, radio emissions at other centimetric wavelengths have been routinely monitored since the 1950 s, thereby offering prospects for building proxies that may be better tailored to space weather needs. Here we advocate the 30 cm flux (F30) as a proxy that is more sensitive than F10.7 to longer wavelengths in the UV and show that it improves the response of the thermospheric density to solar forcing, as modelled with DTM (Drag Temperature Model). In particular, the model bias drops on average by 0–20% when replacing F10.7 by F30; it is also more stable (the standard deviation of the bias is 15–40% smaller) and the density variation at the the solar rotation period is reproduced with a 35–50% smaller error. We compare F30 to other solar proxies and discuss its assets and limitations.

CORRELATIONS BETWEEN PERIODICITIES IN GERMINATION OF CHENOPODIUM BOTRYS AND VARIATIONS IN SOLAR RADIO FLUX

1967 ◽  
Vol 45 (7) ◽  
pp. 1105-1113 ◽  
Author(s):  
Bruce G. Cumming
Keyword(s):  
Solar Radio ◽  
Barometric Pressure ◽  
Lunar Cycle ◽  
Solar Flux ◽  
Sunspot Activity ◽  
Fluorescent Light ◽  
Percentage Germination ◽  
Radio Flux ◽  
Solar Radio Flux ◽  
Exogenous Factors

There were pronounced fluctuations in the percentage germination of seeds of Chenopodium botrys that were kept stored in darkness under carefully controlled conditions of temperature, humidity, and barometric pressure. Germination tests were conducted over a period of more than 2 years in controlled environment cabinets at 30 °C with different photoperiods supplied by fluorescent light. The fluctuations in percentage germination showed no evident correlation with the following factors: relative humidity, barometric pressure, lunar cycle, magnetic intensity.There were highly significant correlations between the fluctuations in germination and solar radio flux (10.7 cm wavelength, indicative of sunspot activity). The best positive correlation between values for solar radio flux and percentage germination suggested that the effect of solar flux on germination (whether direct or indirect) was greatest during the week immediately preceding the wetting of seeds. Periodogram analyses of the periodicity of percentage germination and solar flux has provided two periodograms which have corresponding peaks, showing that the component periods for solar flux are practically the same as those for germination. It cannot yet be stated whether these correlations were indicative of a direct effect of solar radio flux on germination. The present evidence affirms the contention that largely unexamined exogenous factors may influence rhythmic biological processes.

scholarly journals WINDII Observations and WACCM‐X Simulations of High‐Latitude Winds Under Different Solar Radio Flux and Geomagnetic Disturbance Conditions

2019 ◽  
Vol 124 (7) ◽  
pp. 6087-6096
Author(s):  
Shushi Liu ◽  
Gordon G. Shepherd ◽  
Yongsheng Chen ◽  
Marianna G. Shepherd ◽  
Sangay Bhutia
Keyword(s):  
High Latitude ◽  
Solar Radio ◽  
Geomagnetic Disturbance ◽  
Radio Flux ◽  
Solar Radio Flux

Absolute calibration of solar radio flux density at 9375 MHz

1992 ◽  
Vol 16 (1) ◽  
pp. 112
Author(s):  
Zhou Shu-rong ◽  
Xu Fu-ying ◽  
Yu Xing-feng
Keyword(s):  
Flux Density ◽  
Solar Radio ◽  
Absolute Calibration ◽  
Radio Flux ◽  
Solar Radio Flux
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