scholarly journals Long-term variations in the neutral gas composition of the thermosphere over Norilsk (2003–2013)

2017 ◽  
Vol 2 (4) ◽  
pp. 118-125
Author(s):  
Галина Кушнаренко ◽  
Galina Kushnarenko ◽  
Ольга Яковлева ◽  
Olga Yakovleva ◽  
Галина Кузнецова ◽  
...  
Keyword(s):  
Seasonal Variations ◽  
Peak Height ◽  
Gas Composition ◽  
Neutral Gas ◽  
Different Seasons ◽  
Layer Peak ◽  
Long Term Variations

Seasonal variations in relative values of the main gas components of the thermosphere [O]/[N2] and [O2]/[O] were obtained at the station Norilsk during the period 2003–2013. Estimates were made using a technique we devel-oped and data from the Norilsk digisonde (69° N, 88° E) for heights below the ionospheric F1-layer peak height under quiet and disturbed geomagnetic conditions in different seasons. We established that the [O2]/[O] ratio under quiet and disturbed geomagnetic conditions in all seasons by the end of 2013 decreased from 10 to 20 % relative to the values of 2003. The [O]/[N2] ratio for the same conditions increased to 17 %.

scholarly journals Long-term variations in the neutral gas composition of the thermosphere over Norilsk (2003–2013)

2016 ◽  
Vol 2 (4) ◽  
pp. 92-97
Author(s):  
Галина Кузнецова ◽  
Galina Kuznetsova ◽  
Ольга Яковлева ◽  
Olga Yakovleva ◽  
Галина Кушнаренко ◽  
...  
Keyword(s):  
Seasonal Variations ◽  
Gas Composition ◽  
Ionospheric Layer ◽  
Neutral Gas ◽  
Different Seasons ◽  
Long Term Variations

Seasonal variations in relative values of the main gas components of the thermosphere [O]/[N2] and [O2]/[O] were received at the station Norilsk during the period 2003–2013. Estimates were made using a technique the authors developed and data from the Norilsk digisonde (69° N, 88° E) for heights below the ionospheric layer F1 maximum under quiet and disturbed geomagnetic conditions in different seasons. We established that the [O2]/[O] ratio in the quiet and disturbed geomagnetic conditions in all seasons by the end of 2013 decreased from 10 to 20 % relative to the values of 2003. The [O]/[N2] ratio for the same conditions increased to 17 %.

scholarly journals Long-term variations in the neutral gas composition of the termosphere above Irkutsk

2015 ◽  
Vol 1 (4) ◽  
pp. 30-34 ◽  
Author(s):  
Галина Кушнаренко ◽  
Galina Kushnarenko ◽  
Ольга Яковлева ◽  
Olga Yakovleva ◽  
Галина Кузнецова ◽  
...  
Keyword(s):  
Solar Activity ◽  
Gas Composition ◽  
Solar Activity Minimum ◽  
Ionospheric Layer ◽  
Neutral Gas ◽  
Different Seasons ◽  
Long Term Variations

Long-term variations of [O]/[N2] and [O2]/[O] ratios of dominant gas components of the thermosphere are analyzed for 2003–2013. The variations are estimated using the technique developed by the authors and Irkutsk (52° N, 104° E) digisonde data for heights lower than the ionospheric layer F1 maximum, quiet and disturbed geomagnetic conditions, and different seasons. For summer quiet and disturbed conditions, the [O2]/[O] ratio is found to be maximum during long solar activity minimum.

Long-term variations of the oxygen red 630 nm line nightglow intensity

2007 ◽  
Vol 85 (2) ◽  
pp. 189-198 ◽  
Author(s):  
N B Gudadze ◽  
G G Didebulidze ◽  
G Sh. Javakhishvili ◽  
M G Shepherd ◽  
M V Vardosanidze
Keyword(s):  
Line Intensity ◽  
Peak Height ◽  
Mean Value ◽  
Lower Atmosphere ◽  
Data Set ◽  
Term Trend ◽  
Long Term Trend ◽  
Long Term Variations ◽  
Red Line

The long-term data set of total nightglow intensity of the oxygen red 630.0~nm line observed at Abastumani (41.8°N, 42.8°E) between 1957–1993 is investigated. The long-term trend and characteristic variations in solar radiation during an 11 year cycle of the red-line intensity are different after astronomical twilight (premidnight) and at midnight. The amplitude of deviation of the red-line intensity from its mean value at solar maximum and (or) minimum phase is greatest after astronomical twilight and decreases toward midnight. The long-term trend of these variations changes from its value about 0.74 R/year premidnight to its minimum negative value of about –1.92 R/year at and after midnight. This behavior of the long-term trend is considered as a possible result of an increase in electron density below the peak height (hmF2) of the ionospheric F2 layer and lowering of the height hmF2 after midnight predicted by the TIME-GCM model on the assumption of an increase in density of greenhouse gases in the lower atmosphere. The third-order regression equation (with different solar activity indices) is considered to be convenient for describing long-term variations in the mean annual red-line intensity.PACS Nos.: 94.10.Rk, 94.20.Ji, 92.60.Vb

scholarly journals Nocturnal Sporadic-E Activity at Two Southern Hemisphere Stations over Three Solar Cycles

1984 ◽  
Vol 37 (2) ◽  
pp. 231
Author(s):  
WJ Baggaley
Keyword(s):  
Southern Hemisphere ◽  
Sunspot Number ◽  
High Latitude ◽  
Seasonal Variations ◽  
Data Sets ◽  
Solar Cycles ◽  
Geomagnetic Index ◽  
Sporadic E ◽  
Long Term Variations

Analyses are presented of monthly values of the occurrence of the ionospheric parameters j~ E; and foE; for the South Pacific stations Christchurch and Rarotonga over three complete solar cycles. For each station both pre-midnight and post-midnight data show seasonal variations similar to daytime with the high latitude station showing a winter enhancement. Data fluctuations of scales longer than a year are very pronounced compared with variations in other ionospheric parameters. No correlations exist between any of the data sets and either the sunspot number Rz or geomagnetic index. Long-term variations in fi.E, and fo E; are uncorrelated at a particular station.

Long-term and season-specific changes in the body concentrations of magnesium, potassium and calcium by means of quantitative analyses of beard samples collected every day: A case study

2019 ◽  
Vol 29 (01n02) ◽  
pp. 43-52
Author(s):  
K. Sera ◽  
S. Goto ◽  
T. Hosokawa ◽  
Y. Saitoh
Keyword(s):  
Seasonal Variations ◽  
Seasonal Changes ◽  
Potassium Concentration ◽  
The Body ◽  
Annual Variations ◽  
Single Person ◽  
Quantitative Analyses ◽  
Long Term Variations

More than 4000 beard samples were collected from a single person every morning over a 12-year period and analyzed using a standard-free method. We detected significant annual variations in the concentrations of magnesium and calcium in the study period, although significant monthly and seasonal variations were not noted. Calcium tends not to be obtained from season-specific foods or drinks, so its variations may be affected by changes in the metabolism of the body. In contrast, however, potassium showed marked long-term variations with significant seasonal differences. As our previous studies confirmed that green vegetables contain large quantities of potassium and that their supply and consumption increase from May to July, the seasonal variations in potassium concentration were attributed to the ingestion of green vegetables. Although magnesium is also contained in green vegetables in large quantities, its principle supply sources are diverse and its concentration did not show any clear seasonal changes.

Fluvial magnetic susceptibility as a proxy for long‐term variations of mountain permafrost development in the Alp‐Carpathian region

Boreas ◽  
2021 ◽  
Author(s):  
Zoltán Püspöki ◽  
Philip Leonard Gibbard ◽  
Annamária Nádor ◽  
Edit Thamó‐Bozsó ◽  
Pál Sümegi ◽  
...  
Keyword(s):  
Magnetic Susceptibility ◽  
Carpathian Region ◽  
Mountain Permafrost ◽  
Long Term Variations

Long-term variations of C1–C5 alkyl nitrates and their sources in Hong Kong

2021 ◽  
Vol 270 ◽  
pp. 116285
Author(s):  
Lewei Zeng ◽  
Hai Guo ◽  
Xiaopu Lyu ◽  
Beining Zhou ◽  
Zhenhao Ling ◽  
...  
Keyword(s):  
Hong Kong ◽  
Alkyl Nitrates ◽  
Long Term Variations
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