Interplanetary causes of middle latitude ionospheric disturbances

2008 ◽  
pp. 99-119 ◽  
Author(s):  
Bruce T. Tsurutani ◽  
Ezequiel Echer ◽  
Fernando L. Guarnieri ◽  
Olga P. Verkhoglyadova
Keyword(s):  
Middle Latitude ◽  
Ionospheric Disturbances

scholarly journals Topside signature of medium-scale traveling ionospheric disturbances

2014 ◽  
Vol 32 (8) ◽  
pp. 959-965 ◽  
Author(s):  
E. S. Miller ◽  
H. Kil ◽  
J. J. Makela ◽  
R. A. Heelis ◽  
E. R. Talaat ◽  
...  
Keyword(s):  
Electric Fields ◽  
Dissociative Recombination ◽  
Middle Latitude ◽  
Topside Ionosphere ◽  
Ionospheric Disturbances ◽  
Medium Scale ◽  
Traveling Ionospheric Disturbances ◽  
Periodic Groups ◽  
In Situ Sensors

Abstract. Plasma blobs, localized plasma density enhancements that occur singularly or in periodic groups, have been observed by in situ sensors in the lower- and middle-latitude nighttime ionosphere. Traditionally, creation of blobs has been thought to be connected to equatorial plasma bubbles, which are localized plasma depletions. Here, we report the association of blobs with medium-scale traveling ionospheric disturbances (MSTIDs). On 17 January 2010, an all-sky imager on the Caribbean island of Bonaire (geographic: 12.190° N, 68.244° W; geomagnetic 22.46° N, 7.099° E) observed a nighttime electrified MSTID propagating to the southwest. At the time of the MSTID's transit, the Coupled Ion-Neutral Dynamics Investigation instrument onboard the Communication/Navigation Outage Forecasting System satellite detected a group of blobs along the same geomagnetic flux tubes. The electron density variations measured at the satellite altitude, indicating the blobs, are anticorrelated with the intensity variations of the 630.0 nm dissociative recombination emission measured on the same magnetic field lines. This relationship is explained by a modulation of the O+ profile altitude due to electric fields generated within the MSTID. This idea is supported by in situ measurements of the vertical ion velocity. We argue that common climatology between blobs and MSTIDs reported in the literature, as well as this coincident observation, suggest that blobs may be the in situ signature of MSTIDs in the topside ionosphere.

scholarly journals Daytime electron density at the F1-region in Europe during geomagnetic storms

2002 ◽  
Vol 20 (7) ◽  
pp. 1007-1021 ◽  
Author(s):  
D. Buresova ◽  
J. Lastovicka ◽  
D. Altadill ◽  
G. Miro
Keyword(s):  
Solar Activity ◽  
Electron Density ◽  
Geomagnetic Storm ◽  
Geomagnetic Storms ◽  
Middle Latitude ◽  
Lower Latitude ◽  
Ionospheric Disturbances ◽  
Activity Levels ◽  
Middle Latitudes

Abstract. This study attempts to demonstrate changes in the ionospheric F1-region daytime ionization during geomagnetic storms. The F1-region is explored using available data from several European middle latitude and lower latitude observatories and a set of geomagnetic storms encompassing a range of seasons and solar activity levels. The results of analysis suggest systematic seasonal and partly latitudinal differences in the F1-region response to geomagnetic storm. The pattern of the response of the F1-region at higher middle latitudes, a decrease in electron density, does not depend on the type of response of the F2-region and on solar activity. A brief interpretation of these findings is presented.Key words. Ionosphere (ionospheric disturbances; mid-latitude ionosphere)

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