The long-duration positive storm effects in the equatorial ionosphere over Jicamarca

2015 ◽  
Vol 120 (2) ◽  
pp. 1311-1324 ◽  
Author(s):  
Jiawei Kuai ◽  
Libo Liu ◽  
Jing Liu ◽  
Biqiang Zhao ◽  
Yiding Chen ◽  
...  
Keyword(s):  
Equatorial Ionosphere ◽  
Storm Effects ◽  
Long Duration

scholarly journals Three different types of electric field disturbances affecting equatorial ionosphere during a long‐duration prompt penetration event

2015 ◽  
Vol 120 (6) ◽  
pp. 4993-5008 ◽  
Author(s):  
D. Chakrabarty ◽  
Diptiranjan Rout ◽  
R. Sekar ◽  
R. Narayanan ◽  
G. D. Reeves ◽  
...  
Keyword(s):  
Electric Field ◽  
Equatorial Ionosphere ◽  
Long Duration ◽  
Different Types

scholarly journals Ionospheric observations during the geomagnetic storm events on 24-27 July 2004: Long-duration positive storm effects

2012 ◽  
Vol 117 (A9) ◽  
pp. n/a-n/a ◽  
Author(s):  
Chigomezyo M. Ngwira ◽  
Lee-Anne McKinnell ◽  
Pierre J. Cilliers ◽  
Anthea J. Coster
Keyword(s):  
Geomagnetic Storm ◽  
Storm Events ◽  
Storm Effects ◽  
Long Duration

scholarly journals Effects of High-Intensity Long-Duration Continuous AE Activity in the Equatorial Ionosphere Dynamics

2005 ◽  
Author(s):  
José Humberto Andrade Sobral ◽  
Mangalathayil Ali Abdu ◽  
Walter Demetrio González ◽  
Alicia Clua de Gonzalez ◽  
Inez Staciarini Batista ◽  
...  
Keyword(s):  
High Intensity ◽  
Equatorial Ionosphere ◽  
Long Duration

scholarly journals Effects of High-Intensity Long-Duration Continuous AE Activity in the Equatorial Ionosphere Dynamics

2005 ◽  
Author(s):  
José Humberto Andrade Sobral ◽  
Mangalathayil Ali Abdu ◽  
Walter Demetrio González ◽  
Alicia Clua de Gonzalez ◽  
B. Tsurutani ◽  
...  
Keyword(s):  
High Intensity ◽  
Equatorial Ionosphere ◽  
Long Duration

scholarly journals Long-duration geomagnetic storm effects on theDregion of the ionosphere: Some case studies using VLF signal

2015 ◽  
Vol 120 (1) ◽  
pp. 778-787 ◽  
Author(s):  
Abhijit Choudhury ◽  
Barin Kumar De ◽  
Anirban Guha ◽  
Rakesh Roy
Keyword(s):  
Case Studies ◽  
Geomagnetic Storm ◽  
Storm Effects ◽  
Long Duration

The LDE-Type Flare Occurrence (1969-1993)

1994 ◽  
Vol 144 ◽  
pp. 279-282
Author(s):  
A. Antalová
Keyword(s):  
Time Series ◽  
Fourier Analysis ◽  
Sunspot Cycle ◽  
List Type ◽  
Type Number ◽  
Solar Cycles ◽  
Type Iv ◽  
Long Duration ◽  
Cycle Maximum ◽  
Flare Index

AbstractThe occurrence of LDE-type flares in the last three cycles has been investigated. The Fourier analysis spectrum was calculated for the time series of the LDE-type flare occurrence during the 20-th, the 21-st and the rising part of the 22-nd cycle. LDE-type flares (Long Duration Events in SXR) are associated with the interplanetary protons (SEP and STIP as well), energized coronal archs and radio type IV emission. Generally, in all the cycles considered, LDE-type flares mainly originated during a 6-year interval of the respective cycle (2 years before and 4 years after the sunspot cycle maximum). The following significant periodicities were found:• in the 20-th cycle: 1.4, 2.1, 2.9, 4.0, 10.7 and 54.2 of month,• in the 21-st cycle: 1.2, 1.6, 2.8, 4.9, 7.8 and 44.5 of month,• in the 22-nd cycle, till March 1992: 1.4, 1.8, 2.4, 7.2, 8.7, 11.8 and 29.1 of month,• in all interval (1969-1992):a)the longer periodicities: 232.1, 121.1 (the dominant at 10.1 of year), 80.7, 61.9 and 25.6 of month,b)the shorter periodicities: 4.7, 5.0, 6.8, 7.9, 9.1, 15.8 and 20.4 of month.Fourier analysis of the LDE-type flare index (FI) yields significant peaks at 2.3 - 2.9 months and 4.2 - 4.9 months. These short periodicities correspond remarkably in the all three last solar cycles. The larger periodicities are different in respective cycles.

Relation Between Level of Prefrontal Activity and Subject's Performance

1999 ◽  
Vol 13 (2) ◽  
pp. 117-125 ◽  
Author(s):  
Laurence Casini ◽  
Françoise Macar ◽  
Marie-Hélène Giard
Keyword(s):  
Brain Activity ◽  
Sensory Information ◽  
Practice Phase ◽  
Trained Subjects ◽  
Anagram Task ◽  
Economic Information ◽  
Long Duration ◽  
Level Of Activity ◽  
The Brain ◽  
Processing Mechanism

Abstract The experiment reported here was aimed at determining whether the level of brain activity can be related to performance in trained subjects. Two tasks were compared: a temporal and a linguistic task. An array of four letters appeared on a screen. In the temporal task, subjects had to decide whether the letters remained on the screen for a short or a long duration as learned in a practice phase. In the linguistic task, they had to determine whether the four letters could form a word or not (anagram task). These tasks allowed us to compare the level of brain activity obtained in correct and incorrect responses. The current density measures recorded over prefrontal areas showed a relationship between the performance and the level of activity in the temporal task only. The level of activity obtained with correct responses was lower than that obtained with incorrect responses. This suggests that a good temporal performance could be the result of an efficacious, but economic, information-processing mechanism in the brain. In addition, the absence of this relation in the anagram task results in the question of whether this relation is specific to the processing of sensory information only.

Effects of Fatigue on Cognitive Performance in Long-Duration Simulated Flight Missions

2020 ◽  
Vol 10 (2) ◽  
pp. 82-93
Author(s):  
Eduardo Rosa ◽  
Ola Eiken ◽  
Mikael Grönkvist ◽  
Roger Kölegård ◽  
Nicklas Dahlström ◽  
...  
Keyword(s):  
Executive Functions ◽  
Task Performance ◽  
Cognitive Performance ◽  
Cognitive Tasks ◽  
Fatigue Index ◽  
Fighter Aircraft ◽  
Long Duration ◽  
Metacognitive Accuracy

Abstract. Fighter pilots may be exposed to extended flight missions. Consequently, there is increasing concern about fatigue. We investigated the effects of fatigue and cognitive performance in a simulated 11-hr mission in the 39 Gripen fighter aircraft. Five cognitive tasks were used to assess cognitive performance. Fatigue was measured with the Samn–Perelli Fatigue Index. Results showed that performance in the non-executive task degraded after approximately 7 hr. Fatigue ratings showed a matching trend to the performance in this task. Performance in tasks taxing executive functions did not decline. We interpreted that fatigue can be overridden by increased attentional effort for executive tasks but not for non-executive components of cognition. Participants underestimated their performance and metacognitive accuracy was not influenced by fatigue.

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