Lunar Tide in the F Region Ionosphere

2019 ◽  
Vol 124 (9) ◽  
pp. 7654-7669 ◽  
Author(s):  
Jeffrey M. Forbes ◽  
Xiaoli Zhang
Keyword(s):  
Lunar Tide ◽  
F Region

On the solar modulation of the atmospheric lunar tide

Tellus ◽  
1980 ◽  
Vol 32 (1) ◽  
pp. 27-32
Author(s):  
A. Palumbo ◽  
A. Mazzarella
Keyword(s):  
Solar Modulation ◽  
Lunar Tide

High Latitude F-Region Drift Studies.

1986 ◽  
Author(s):  
Bodo W. Reinisch ◽  
Jurgen Buchau ◽  
Edward J. Weber ◽  
Claude G. Dozois ◽  
Klaus Bibl
Keyword(s):  
High Latitude ◽  
F Region

scholarly journals The Glycine-Phenylalanine-Rich Region Determines the Specificity of the Yeast Hsp40 Sis1

1999 ◽  
Vol 19 (11) ◽  
pp. 7751-7758 ◽  
Author(s):  
Wei Yan ◽  
Elizabeth A. Craig
Keyword(s):  
Amino Acids ◽  
Molecular Chaperones ◽  
Rich Region ◽  
Critical Determinant ◽  
Unique Region ◽  
Chimeric Genes ◽  
F Region ◽  
Initiation Of Translation ◽  
J Domain ◽  
Essential Function

ABSTRACT Hsp40s are ubiquitous, conserved proteins which function with molecular chaperones of the Hsp70 class. Sis1 is an essential Hsp40 of the cytosol of Saccharomyces cerevisiae, thought to be required for initiation of translation. We carried out a genetic analysis to determine the regions of Sis1 required to perform its key function(s). A C-terminal truncation of Sis1, removing 231 amino acids but retaining the N-terminal 121 amino acids encompassing the J domain and the glycine-phenylalanine-rich (G-F) region, was able to rescue the inviability of a Δsis1 strain. The yeast cytosol contains other Hsp40s, including Ydj1. To determine which regions carried the critical determinants of Sis1 function, we constructed chimeric genes containing portions of SIS1 and YDJ1. A chimera containing the J domain of Sis1 and the G-F region of Ydj1 could not rescue the lethality of the Δsis1 strain. However, a chimera with the J domain of Ydj1 and the G/F region of Sis1 could rescue the strain’s lethality, indicating that the G-F region is a unique region required for the essential function of Sis1. However, a J domain is also required, as mutants expected to cause a disruption of the interaction of the J domain with Hsp70 are inviable. We conclude that the G-F region, previously thought only to be a linker or spacer region between the J domain and C-terminal regions of Hsp40s, is a critical determinant of Sis1 function.

Equatorial F region evening vertical drift, and peak height, during southern winter months: A comparison of observational data with the IRI descriptions

2006 ◽  
Vol 37 (5) ◽  
pp. 1007-1017 ◽  
Author(s):  
M.A. Abdu ◽  
I.S. Batista ◽  
B.W. Reinisch ◽  
J.H.A. Sobral ◽  
A.J. Carrasco
Keyword(s):  
Observational Data ◽  
Peak Height ◽  
F Region ◽  
Vertical Drift

scholarly journals A study of atmospheric gravity waves and travelling ionospheric disturbances at equatorial latitudes

1997 ◽  
Vol 15 (8) ◽  
pp. 1048-1056 ◽  
Author(s):  
R. L. Balthazor ◽  
R. J. Moffett
Keyword(s):  
Gravity Waves ◽  
Large Scale ◽  
Ionospheric Disturbance ◽  
Magnetic Equator ◽  
Ionospheric Disturbances ◽  
Atmospheric Gravity Waves ◽  
Opposite Hemisphere ◽  
Travelling Ionospheric Disturbances ◽  
F Region ◽  
Atmospheric Gravity

Abstract. A global coupled thermosphere-ionosphere-plasmasphere model is used to simulate a family of large-scale imperfectly ducted atmospheric gravity waves (AGWs) and associated travelling ionospheric disturbances (TIDs) originating at conjugate magnetic latitudes in the north and south auroral zones and subsequently propagating meridionally to equatorial latitudes. A 'fast' dominant mode and two slower modes are identified. We find that, at the magnetic equator, all the clearly identified modes of AGW interfere constructively and pass through to the opposite hemisphere with unchanged velocity. At F-region altitudes the 'fast' AGW has the largest amplitude, and when northward propagating and southward propagating modes interfere at the equator, the TID (as parameterised by the fractional change in the electron density at the F2 peak) increases in magnitude at the equator. The amplitude of the TID at the magnetic equator is increased compared to mid-latitudes in both upper and lower F-regions with a larger increase in the upper F-region. The ionospheric disturbance at the equator persists in the upper F-region for about 1 hour and in the lower F-region for 2.5 hours after the AGWs first interfere, and it is suggested that this is due to enhancements of the TID by slower AGW modes arriving later at the magnetic equator. The complex effects of the interplays of the TIDs generated in the equatorial plasmasphere are analysed by examining neutral and ion winds predicted by the model, and are demonstrated to be consequences of the forcing of the plasmasphere along the magnetic field lines by the neutral air pressure wave.

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