scholarly journals Unusual declining phase of solar cycle 23: Weak semi-annual variations of auroral hemispheric power and geomagnetic activity

2009 ◽  
Vol 36 (22) ◽  
Author(s):  
Xiaoli Luan ◽  
Wenbin Wang ◽  
Alan G. Burns ◽  
Stanley C. Solomon ◽  
Yongliang Zhang ◽  
...  
Keyword(s):  
Solar Cycle ◽  
Geomagnetic Activity ◽  
Annual Variations ◽  
Solar Cycle 23

A prediction of geomagnetic activity for solar cycle 23

1999 ◽  
Vol 104 (A4) ◽  
pp. 6871-6876 ◽  
Author(s):  
E. W. Cliver ◽  
A. G. Ling ◽  
J. E. Wise ◽  
L. J. Lanzerotti
Keyword(s):  
Solar Cycle ◽  
Geomagnetic Activity ◽  
Solar Cycle 23

scholarly journals Ionospheric response to CIR-induced recurrent geomagnetic activity during the declining phase of solar cycle 23

2015 ◽  
Vol 120 (2) ◽  
pp. 1394-1418 ◽  
Author(s):  
Yanhong Chen ◽  
Wenbin Wang ◽  
Alan G. Burns ◽  
Siqing Liu ◽  
Jiancun Gong ◽  
...  
Keyword(s):  
Solar Cycle ◽  
Geomagnetic Activity ◽  
Ionospheric Response ◽  
Solar Cycle 23

scholarly journals Solar wind high-speed streams and related geomagnetic activity in the declining phase of solar cycle 23

2011 ◽  
Vol 533 ◽  
pp. A49 ◽  
Author(s):  
G. Verbanac ◽  
B. Vršnak ◽  
S. Živković ◽  
T. Hojsak ◽  
A. M. Veronig ◽  
...  
Keyword(s):  
Solar Wind ◽  
Solar Cycle ◽  
Geomagnetic Activity ◽  
High Speed ◽  
Solar Cycle 23

A wavelet analysis of F2 layer critical frequency over solar cycle 23

2018 ◽  
Vol 13 (S340) ◽  
pp. 157-158
Author(s):  
C. S. Seema ◽  
P. R. Prince
Keyword(s):  
Solar Cycle ◽  
Critical Frequency ◽  
Power Spectra ◽  
Quasi Biennial Oscillation ◽  
Equatorial Latitude ◽  
Annual Variations ◽  
Latitudinal Dependence ◽  
Hourly Data ◽  
Solar Cycle 23 ◽  
Direct Outcome

AbstractTemporal oscillations of F2 layer critical frequency are direct outcome of solar EUV variability. The hourly data of F2 layer critical frequency (foF2) during solar cycle 23 over eight ionosonde stations which falls within same longitudinal span are evaluated using Continuous Wavelet Transform (CWT) to estimate the ionospheric variations. The quasi triennial, annual, semiannual, 27 day and diurnal variations of foF2 are clearly evident in the wavelet power spectra of all the stations. Quasi triennial oscillations which show a clear latitudinal dependence is more evident in southern stations. A strong quasi biennial oscillation (QBO) is also noticed in higher latitudes which was not observable in equatorial latitude. The present study reveals that the semiannual variations are more obvious over the annual variation in the equatorial and low latitude stations while the annual variations are prominent in higher latitudes.

scholarly journals Annual variations in westward auroral electrojet and substorm occurrence rate during solar cycle 23

2014 ◽  
Vol 119 (3) ◽  
pp. 2061-2068 ◽  
Author(s):  
Jianpeng Guo ◽  
T. I. Pulkkinen ◽  
E. I. Tanskanen ◽  
Xueshang Feng ◽  
Barbara A. Emery ◽  
...  
Keyword(s):  
Solar Cycle ◽  
Auroral Electrojet ◽  
Occurrence Rate ◽  
Annual Variations ◽  
Solar Cycle 23
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