Vertical TEC variations and model during low solar activity at a low latitude station, Xiamen

2012 ◽  
Vol 49 (3) ◽  
pp. 530-538 ◽  
Author(s):  
Guoqi Liu ◽  
Wengeng Huang ◽  
Hua Shen ◽  
Jiancun Gong
Keyword(s):  
Solar Activity ◽  
Low Latitude ◽  
Latitude Station

scholarly journals Characteristics of VHF radiowave scintillations over a solar cycle (1983−1993) at a low-latitude station: Waltair (17.7°N, 83.3°E)

1997 ◽  
Vol 15 (6) ◽  
pp. 729-733 ◽  
Author(s):  
P. V. S. Rama Rao ◽  
P. T. Jayachandran ◽  
P. Sri Ram ◽  
B. V. Ramana Rao ◽  
D. S. V. V. D. Prasad ◽  
...  
Keyword(s):  
Solar Activity ◽  
Solar Cycle ◽  
High Solar Activity ◽  
Night Time ◽  
Low Latitude ◽  
Latitude Station ◽  
Maximum Occurrence

Abstract. The characteristics of VHF radiowave scintillations at 244 MHz (FLEETSAT) during a complete solar cycle (1983–93) at a low-latitude station, Waltair (17.7°N, 83.3°E), are presented. The occurrence of night-time scintillations shows equinoctial maxima and summer minima in all the epochs of solar activity, and follows the solar activity. The daytime scintillation occurrence is negatively correlated with the solar activity and shows maximum occurrence during the summer months in a period of low solar activity. The occurrence of night-time scintillations is inhibited during disturbed days of high solar activity and enhanced during low solar activity.

F3 layer feature under low and medium solar activity observed at a Chinese low latitude station Fuke

2013 ◽  
Vol 52 (3) ◽  
pp. 383-390 ◽  
Author(s):  
Zhengping Zhu ◽  
Kun Chen ◽  
Jiaping Lan ◽  
Fenglou Sun
Keyword(s):  
Solar Activity ◽  
Low Latitude ◽  
Latitude Station

scholarly journals Variability of ionospheric TEC at low latitude station, Hyderabad during medium solar activity

2021 ◽  
Vol 21 (2) ◽  
pp. 1-12
Author(s):  
Shivangi Bhardwaj ◽  
Parvaiz A. Khan ◽  
Azad A. Manssori ◽  
Rafi Ahmad ◽  
P. K. Purohit
Keyword(s):  
Solar Activity ◽  
Low Latitude ◽  
Latitude Station

scholarly journals A comparative study of night-time enhancement of TEC at a low latitude station on storm and quiet nights including the local time, seasonal and solar activity dependence

2002 ◽  
Vol 20 (11) ◽  
pp. 1843-1850 ◽  
Author(s):  
K. Unnikrishnan ◽  
R. Balachandran Nair ◽  
C. Venugopal
Keyword(s):  
Solar Activity ◽  
Mean Amplitude ◽  
Occurrence Frequency ◽  
Plasma Convection ◽  
Night Time ◽  
Low Latitude ◽  
Latitude Station ◽  
Different Seasons ◽  
The Mean ◽  
Activity Dependence

Abstract. The main characteristics of night-time enhancements in TEC during magnetic storms are compared with those during quiet nights for different seasons and solar activity conditions at Palehua, a low latitude station during the period 1980–1989. We find that the mean amplitude has both a seasonal and solar activity dependence: in winter, the values are higher for weak storms as compared to those during quiet nights and increase with an increase in solar activity. In summer, the mean amplitude values during weak storms and quiet nights are almost equal. But during equinox, the mean amplitude values for quiet nights are greater than those during weak storms. The mean half-amplitude duration is higher during weak storms as compared to that during quiet nights in summer. However, during winter and equinox, the durations are almost equal for both quiet and weak storm nights. For the mean half-amplitude duration, the quiet night values for all the seasons and equinoctial weak storm values increase with an increase in solar activity. The occurrence frequency (in percent) of TEC enhancement during weak storms is greater than during quiet nights for all seasons. The mean amplitude, the mean half-amplitude duration and the occurrence frequency (in percent) of TEC enhancement values are higher during major storms as compared to those during quiet nights. The above parameters have their highest values during pre-midnight hours. From the data analysed, this behaviour is true in the case of major storms also.Key words. Ionosphere (ionospheric disturbances; plasma convection) Magnetospheric physics (storms and substorms)

Nighttime enhancements in ionospheric electron content: seasonal and solar cycle variation

1995 ◽  
Vol 13 (3) ◽  
pp. 256-261 ◽  
Author(s):  
S. Jain ◽  
S. K. Vijay ◽  
A. K. Gwal ◽  
Y. N. Huang
Keyword(s):  
Solar Activity ◽  
Solar Cycle ◽  
Negative Correlation ◽  
Electron Content ◽  
Equatorial Anomaly ◽  
Low Latitude ◽  
Solar Cycle Variation ◽  
Latitude Station ◽  
Cycle Variation ◽  
Ionospheric Electron Content

Abstract. Various characteristics of anomalous nighttime enhancement in ionospheric electron content (IEC) at Lunping (14.08°N geomagnetic), a station near the crest of the equatorial anomaly, have been presented by considering the IEC data for the 21st solar cycle. Out of a total of 1053 enhancements, 354 occur in pre-midnight and 699 occur in post-midnight hours, which indicates an overall dominance of post-midnight events at Lunping. The occurrence is more frequent during summer, less during the equinox and least during winter months. All the characteristics of the enhancements have seasonal dependencies and they reach their maximum values during summer months. The occurrence of the pre-midnight events show positive and post-midnight events show negative correlation with solar activity. The results have been discussed and compared with those at low-latitude stations in India and Hawaii and at the mid-latitude station, Tokyo.

Sign in / Sign up

Export Citation Format

Share Document