Low-latitude coronal hole as the only possible explanation for the November 25, 1978, geomagnetic storm: Comment on ‘‘Solar sources of interplanetary southward Bz events responsible for major magnetic storms (1978-1979)’’ by F. Tang et al.

1990 ◽  
Vol 95 (A7) ◽  
pp. 10717
Author(s):  
Román Pérez-Enríquez ◽  
Blanca Mendoza
Keyword(s):  
Coronal Hole ◽  
Geomagnetic Storm ◽  
Magnetic Storms ◽  
Low Latitude

scholarly journals Middle‐ and low‐latitude ionosphere response to 2015 St. Patrick's Day geomagnetic storm

2016 ◽  
Vol 121 (4) ◽  
pp. 3421-3438 ◽  
Author(s):  
B. Nava ◽  
J. Rodríguez‐Zuluaga ◽  
K. Alazo‐Cuartas ◽  
A. Kashcheyev ◽  
Y. Migoya‐Orué ◽  
...  
Keyword(s):  
Geomagnetic Storm ◽  
Low Latitude ◽  
Low Latitude Ionosphere

scholarly journals Longitudinal differences observed in the ionospheric F-region during the major geomagnetic storm of 31 March 2001

2004 ◽  
Vol 22 (9) ◽  
pp. 3221-3229 ◽  
Author(s):  
Y. Sahai ◽  
P. R. Fagundes ◽  
F. Becker-Guedes ◽  
J. R. Abalde ◽  
G. Crowley ◽  
...  
Keyword(s):  
Geomagnetic Storm ◽  
Recovery Period ◽  
Negative Phase ◽  
Quiet Period ◽  
Geomagnetic Disturbances ◽  
Low Latitude ◽  
F Region ◽  
Similarities And Differences ◽  
Worldwide Network ◽  
Ionospheric Sounding

Abstract. A new ionospheric sounding station using a Canadian Advanced Digital Ionosonde (CADI) was established for routine measurements by the "Universidade do Vale do Paraiba (UNIVAP)" at São José dos Campos (23.2° S, 45.9° W), Brazil, in August 2000. A major geomagnetic storm with gradual commencement at about 01:00 UT was observed on 31 March 2001. In this paper, we present and discuss salient features from the ionospheric sounding measurements carried out at S. J. Campos on the three consecutive UT days 30 March (quiet), 31 March (disturbed) and 1 April (recovery) 2001. During most of the storm period, the foF2 values showed negative phase, whereas during the two storm-time peaks, large F-region height variations were observed. In order to study the longitudinal differences observed in the F-region during the storm, the simultaneous ionospheric sounding measurements carried out at S. J. Campos, El Arenosillo (37.1° N, 6.7° W), Spain, Okinawa (26.3° N, 127.8° E), Japan and Wakkanai (45.5° N, 141.7° E), Japan, during the period 30 March-1 April 2001, have been analyzed. A comparison of the observed ionospheric parameters (h'F and foF2) in the two longitudinal zones (1. Japanese and 2. Brazilian-Spanish) shows both similarities and differences associated with the geomagnetic disturbances. Some latitudinal differences are also observed in the two longitudinal zones. In addition, global ionospheric TEC maps from the worldwide network of GPS receivers are presented, showing widespread TEC changes during both the main and recovery phases of the storm. The ionospheric sounding measurements are compared with the ASPEN-TIMEGCM model runs appropriate for the storm conditions. The model results produce better agreement during the quiet period. During the disturbed period, some of the observed F-region height variations are well reproduced by the model results. The model foF2 and TEC results differ considerably during the recovery period and indicate much stronger negative phase at all the stations, particularly at the low-latitude ones.

Low latitude ionospheric response to March 2015 geomagnetic storm using multi-instrument TEC observations over India

2020 ◽  
Vol 365 (12) ◽  
Author(s):  
A. Vishnu Vardhan ◽  
P. Babu Sree Harsha ◽  
D. Venkata Ratnam ◽  
A. K. Upadhayaya
Keyword(s):  
Geomagnetic Storm ◽  
Low Latitude ◽  
Ionospheric Response

scholarly journals The response of local power grid at low-latitude to geomagnetic storm: An application of the Hilbert Huang transform

Space Weather ◽  
2016 ◽  
Vol 14 (4) ◽  
pp. 300-312 ◽  
Author(s):  
Jin Liu ◽  
Chuan-Bing Wang ◽  
Lu Liu ◽  
Wei-Huai Sun
Keyword(s):  
Geomagnetic Storm ◽  
Power Grid ◽  
Local Power ◽  
Low Latitude ◽  
Hilbert Huang Transform
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