Dependence of ionospheric response on the local time of sudden commencement and the intensity of geomagnetic storms

1990 ◽  
Vol 52 (4) ◽  
pp. 269-275 ◽  
Author(s):  
N. Balan ◽  
P.B. Rao
Keyword(s):  
Local Time ◽  
Geomagnetic Storms ◽  
Sudden Commencement ◽  
Ionospheric Response

On the interpretation of the sudden commencement of geomagnetic storms

1964 ◽  
Vol 69 (1) ◽  
pp. 139-155 ◽  
Author(s):  
E. J. Stegelmann ◽  
C. H. von Kenschitzki
Keyword(s):  
Geomagnetic Storms ◽  
Sudden Commencement

Ionospheric response to the 17 March and 22 June 2015 geomagnetic storms over Wuhan region using GNSS-based tomographic technique

2021 ◽  
Vol 67 (1) ◽  
pp. 111-121
Author(s):  
Jian Feng ◽  
Yufeng Zhou ◽  
Yan Zhou ◽  
Shuaihe Gao ◽  
Chen Zhou ◽  
...  
Keyword(s):  
Geomagnetic Storms ◽  
Ionospheric Response ◽  
Tomographic Technique

scholarly journals Ionospheric Response to Strong Geomagnetic Storms During 2000–2005: An IMF Clock Angle Perspective

Radio Science ◽  
2020 ◽  
Vol 55 (9) ◽  
Author(s):  
Sumanjit Chakraborty ◽  
Sarbani Ray ◽  
Abhirup Datta ◽  
Ashik Paul
Keyword(s):  
Geomagnetic Storms ◽  
Ionospheric Response ◽  
Imf Clock Angle

scholarly journals Unexpected Southern Hemisphere ionospheric response to geomagnetic storm of 15 August 2015

2018 ◽  
Vol 36 (1) ◽  
pp. 71-79 ◽  
Author(s):  
Ilya Edemskiy ◽  
Jan Lastovicka ◽  
Dalia Buresova ◽  
John Bosco Habarulema ◽  
Ivan Nepomnyashchikh
Keyword(s):  
South Africa ◽  
Southern Hemisphere ◽  
Geomagnetic Storms ◽  
Geomagnetic Latitude ◽  
Electron Content ◽  
Solar Activity Minimum ◽  
Total Electron ◽  
Ionospheric Response ◽  
Middle Latitudes ◽  
Local Noon

Abstract. Geomagnetic storms are the most pronounced phenomenon of space weather. When studying ionospheric response to a storm of 15 August 2015, an unexpected phenomenon was observed at higher middle latitudes of the Southern Hemisphere. This phenomenon was a localized total electron content (TEC) enhancement (LTE) in the form of two separated plumes, which peaked southward of South Africa. The plumes were first observed at 05:00 UT near the southwestern coast of Australia. The southern plume was associated with local time slightly after noontime (1–2 h after local noon). The plumes moved with the Sun. They peaked near 13:00 UT southward of South Africa. The southern plume kept constant geomagnetic latitude (63–64° S); it persisted for about 10 h, whereas the northern plume persisted for about 2 h more. Both plumes disappeared over the South Atlantic Ocean. No similar LTE event was observed during the prolonged solar activity minimum period of 2006–2009. In 2012–2016 we detected altogether 26 LTEs and all of them were associated with the southward excursion of Bz. The negative Bz excursion is a necessary but not sufficient condition for the LTE occurrence as during some geomagnetic storms associated with negative Bz excursions the LTE events did not appear.

An opposite response of the low-latitude ionosphere at Asian and American sectors during storm recovery phase: drivers from below and above

2020 ◽  
Author(s):  
Chao Xiong ◽  
Hermann Luehr ◽  
Yosuke Yamazaki
Keyword(s):  
Geomagnetic Storms ◽  
Recovery Phase ◽  
The Philippines ◽  
Lower Atmosphere ◽  
Electron Content ◽  
Early Recovery ◽  
Total Electron ◽  
Ionospheric Response ◽  
Swarm Satellites ◽  
Opposite Response

<p>The energy input from the solar wind and magnetosphere is thought to dominate the ionospheric response during geomagnetic storms. However, at the storm recovery phase, the role of forces from lower atmosphere could be as important as that from above. In this study, we focused on the geomagnetic storm happened on 6–11 September 2017. The ground-based total electron content (TEC) data as well as the F region in situ electron density measured by the Swarm satellites reveals that at low and equatorial latitudes the dayside ionosphere shows as prominent positive and negative responses at the Asian and American longitudinal sectors, respectively. The global distribution of thermospheric O/N2 ratio measured by global ultraviolet imager on board the TIMED satellite cannot well explain such longitudinally opposite response of the ionosphere. Comparison between the equatorial electrojet variations from stations at Huancayo in Peru and Davao in the Philippines suggests that the longitudinally opposite ionospheric response should be closely associated with the interplay of E region electrodynamics. By further applying nonmigrating tidal analysis to the ground‐based TEC data, we find that the diurnal tidal components, D0 and DW2, as well as the semidiurnal component SW1, are clearly enhanced over prestorm days and persist into the early recovery phase, indicating the possibility of lower atmospheric forcing contributing to the longitudinally opposite response of the ionosphere on 9–11 September 2017.</p>

Theoretically modeling the low-latitude, ionospheric response to large geomagnetic storms

Radio Science ◽  
2006 ◽  
Vol 41 (5) ◽  
Author(s):  
D. Anderson ◽  
A. Anghel ◽  
E. Araujo ◽  
V. Eccles ◽  
C. Valladares ◽  
...  
Keyword(s):  
Geomagnetic Storms ◽  
Low Latitude ◽  
Ionospheric Response

scholarly journals Superposed epoch analysis of the dayside ionospheric response to four intense geomagnetic storms

2008 ◽  
Vol 113 (A3) ◽  
pp. n/a-n/a ◽  
Author(s):  
A. J. Mannucci ◽  
B. T. Tsurutani ◽  
M. A. Abdu ◽  
W. D. Gonzalez ◽  
A. Komjathy ◽  
...  
Keyword(s):  
Geomagnetic Storms ◽  
Ionospheric Response ◽  
Superposed Epoch Analysis ◽  
Epoch Analysis

Local time dependant response of Indian equatorial ionosphere to the moderate geomagnetic storms

2007 ◽  
Vol 39 (8) ◽  
pp. 1304-1312 ◽  
Author(s):  
S. Tulasi Ram ◽  
P.V.S. Rama Rao ◽  
D.S.V.V.D. Prasad ◽  
K. Niranjan ◽  
R. Sridharan ◽  
...  
Keyword(s):  
Local Time ◽  
Geomagnetic Storms ◽  
Equatorial Ionosphere

scholarly journals Evaluation of automatic ionogram scaling for use in real-time ionospheric density profile specification: Dourbes DGS-256/ARTIST-4 performance

2012 ◽  
Vol 55 (2) ◽  
Author(s):  
Stanimir M. Stankov ◽  
Jean-Claude Jodogne ◽  
Ivan Kutiev ◽  
Koen Stegen ◽  
René Warnant
Keyword(s):  
Solar Activity ◽  
Real Time ◽  
Local Time ◽  
Density Profile ◽  
Error Bounds ◽  
Statistical Evaluation ◽  
Geomagnetic Storms ◽  
Automatic Scaling ◽  
Time Period ◽  
Analysis Error

<p>Statistical evaluation of the Dourbes (4.6˚E, 50.1˚N) digisonde automatic scaling of the more frequently used ionospheric parameters (foF2, foF1, foE, h’F2, h’F, h’E, and M3000F2) was performed using automatically and manually scaled data from the time period of 2002 to 2008. Automatic scaling was provided in 92% to 94% of cases for most characteristics, except for foF1 (81%). In terms of the automatic scaling accuracy, the magnitude of the residual error for foF2 and M3000F2 (automatically minus manually scaled values) varied according to local time, season, and solar activity. Although geomagnetic storms appear to affect the automatic scaling, the overall results for the influence of geomagnetic activity were inconclusive. Based on this analysis, error bounds were determined (95% probability) for each characteristic: foF2 (–0.75,+0.85), foF1(–0.25,+0.35), foE(–0.35,+0.40), h’F2(–68,+67), h’F(–38,+32), h’E(–26,+2), and M3000F2(–0.55,+0.45).</p>

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