scholarly journals Ionospheric VTEC and thermospheric infrared emission dynamics during corotating interaction region and high-speed stream intervals at solar minimum: 25 March to 26 April 2008

2011 ◽  
Vol 116 (A9) ◽  
pp. n/a-n/a ◽  
Author(s):  
O. P. Verkhoglyadova ◽  
B. T. Tsurutani ◽  
A. J. Mannucci ◽  
M. G. Mlynczak ◽  
L. A. Hunt ◽  
...  
Keyword(s):  
Solar Minimum ◽  
High Speed ◽  
Infrared Emission ◽  
Interaction Region ◽  
Corotating Interaction Region ◽  
High Speed Stream

scholarly journals Response of the total electron content at Brazilian low latitudes to corotating interaction region and high-speed streams during solar minimum 2008

2018 ◽  
Vol 70 (1) ◽  
Author(s):  
Claudia M. N. Candido ◽  
Inez S. Batista ◽  
Virginia Klausner ◽  
Patricia M. de Siqueira Negreti ◽  
Fabio Becker-Guedes ◽  
...  
Keyword(s):  
Total Electron Content ◽  
Solar Minimum ◽  
High Speed ◽  
Interaction Region ◽  
Electron Content ◽  
Corotating Interaction Region ◽  
Total Electron ◽  
Low Latitudes

scholarly journals High-speed stream impacts on the equatorial ionization anomaly region during the deep solar minimum year 2008

2012 ◽  
Vol 117 (A10) ◽  
pp. n/a-n/a ◽  
Author(s):  
Jing Liu ◽  
Libo Liu ◽  
Biqiang Zhao ◽  
Yong Wei ◽  
Lianhuan Hu ◽  
...  
Keyword(s):  
Solar Minimum ◽  
High Speed ◽  
High Speed Stream ◽  
Equatorial Ionization Anomaly ◽  
Anomaly Region

scholarly journals An alternative way to identify local geomagnetically quiet days: a case study using wavelet analysis

2016 ◽  
Vol 34 (4) ◽  
pp. 451-462 ◽  
Author(s):  
Virginia Klausner ◽  
Andrés Reinaldo Rodriguez Papa ◽  
Cláudia Maria Nicole Cândido ◽  
Margarete Oliveira Domingues ◽  
Odim Mendes
Keyword(s):  
Wavelet Analysis ◽  
Geomagnetic Activity ◽  
Solar Minimum ◽  
High Speed ◽  
Wavelet Coefficient ◽  
Magnetic Activity ◽  
New Method ◽  
Storm Events ◽  
High Speed Stream

Abstract. This paper proposes a new method to evaluate geomagnetic activity based on wavelet analysis during the solar minimum activity (2007). In order to accomplish this task, a newly developed algorithm called effectiveness wavelet coefficient (EWC) was applied. Furthermore, a comparison between the 5 geomagnetically quiet days determined by the Kp-based method and by wavelet-based method was performed. This paper provides a new insight since the geomagnetic activity indexes are mostly designed to quantify the extent of disturbance rather than the quietness. The results suggest that the EWC can be used as an alternative tool to accurately detect quiet days, and consequently, it can also be used as an alternative to determine the Sq baseline to the current Kp-based 5 quietest days method. Another important aspect of this paper is that most of the quietest local wavelet candidate days occurred in an interval 2 days prior to the high-speed-stream-driven storm events. In other words, the EWC algorithm may potentially be used to detect the quietest magnetic activity that tends to occur just before the arrival of high-speed-stream-driven storms.

scholarly journals Ionospheric storms on Mars: Impact of the corotating interaction region

2009 ◽  
Vol 36 (1) ◽  
Author(s):  
E. Dubinin ◽  
M. Fraenz ◽  
J. Woch ◽  
F. Duru ◽  
D. Gurnett ◽  
...  
Keyword(s):  
Interaction Region ◽  
Corotating Interaction Region

scholarly journals Ionospheric response to the corotating interaction region-driven geomagnetic storm of October 2002

2009 ◽  
Vol 114 (A12) ◽  
pp. n/a-n/a ◽  
Author(s):  
D. Pokhotelov ◽  
C. N. Mitchell ◽  
P. T. Jayachandran ◽  
J. W. MacDougall ◽  
M. H. Denton
Keyword(s):  
Geomagnetic Storm ◽  
Interaction Region ◽  
Corotating Interaction Region ◽  
Ionospheric Response

scholarly journals Spectral analysis of auroral geomagnetic activity during various solar cycles between 1960 and 2014

2016 ◽  
Vol 34 (12) ◽  
pp. 1159-1164 ◽  
Author(s):  
Pieter Benjamin Kotzé
Keyword(s):  
Spectral Analysis ◽  
Geomagnetic Activity ◽  
Solar Minimum ◽  
High Speed ◽  
Solar Rotation ◽  
Pearson Correlation ◽  
Coronal Holes ◽  
Rotation Period ◽  
Period Change ◽  
Solar Cycles

Abstract. In this paper we use wavelets and Lomb–Scargle spectral analysis techniques to investigate the changing pattern of the different harmonics of the 27-day solar rotation period of the AE (auroral electrojet) index during various phases of different solar cycles between 1960 and 2014. Previous investigations have revealed that the solar minimum of cycles 23–24 exhibited strong 13.5- and 9.0-day recurrence in geomagnetic data in comparison to the usual dominant 27.0-day synodic solar rotation period. Daily mean AE indices are utilized to show how several harmonics of the 27-day recurrent period change during every solar cycle subject to a 95 % confidence rule by performing a wavelet analysis of each individual year's AE indices. Results show that particularly during the solar minimum of 23–24 during 2008 the 27-day period is no longer detectable above the 95 % confidence level. During this interval geomagnetic activity is now dominated by the second (13.5-day) and third (9.0-day) harmonics. A Pearson correlation analysis between AE and various spherical harmonic coefficients describing the solar magnetic field during each Carrington rotation period confirms that the solar dynamo has been dominated by an unusual combination of sectorial harmonic structure during 23–24, which can be responsible for the observed anomalously low solar activity. These findings clearly show that, during the unusual low-activity interval of 2008, auroral geomagnetic activity was predominantly driven by high-speed solar wind streams originating from multiple low-latitude coronal holes distributed at regular solar longitude intervals.

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