Large-amplitude nightglow OH (8-3) band intensity and rotational temperature variations during a 24-hour period at 78°N

1983 ◽  
Vol 88 (A11) ◽  
pp. 9255-9259 ◽  
Author(s):  
H. K. Myrabø ◽  
C. S. Deehr ◽  
G. G. Sivjee
Keyword(s):  
Large Amplitude ◽  
Rotational Temperature ◽  
Band Intensity ◽  
Temperature Variations

Study of the (4–1) and (5–2) Hydroxyl Bands in the Night Airglow

1971 ◽  
Vol 49 (19) ◽  
pp. 2509-2517 ◽  
Author(s):  
A. W. Harrison ◽  
W. F. J. Evans ◽  
E. J. Llewellyn
Keyword(s):  
Seasonal Variation ◽  
Rotational Temperature ◽  
Band Intensity ◽  
K Value ◽  
Intensity Fluctuations ◽  
Single Night ◽  
Summer Minimum ◽  
Night Airglow

A 1 year study of the (4–1) and (5–2) hydroxyl bands in the night airglow near 1 μ has revealed a non-uniform rotational temperature across the P branch of each band. The temperature increases with K′ value. There is a pronounced seasonal variation of temperature showing a summer minimum and winter maximum. The average measured brightness for the (4–1) band is 4.6 kR (winter) and 3.5 kR (summer), and for the (5–2) band is 5.8 kR (winter) and 4.3 kR (summer). It is shown that the time-averaged total band intensity fluctuations during a single night are quite large, sometimes a factor of 2, and are not definitely correlated with the rotational temperature during the same period.

Rotational temperature variations in pulsating auroras

1981 ◽  
Vol 59 (8) ◽  
pp. 1143-1149 ◽  
Author(s):  
R. A. Koehler ◽  
M. M. Shepherd ◽  
G. G. Shepherd ◽  
K. V. Paulson
Keyword(s):  
Energy Distribution ◽  
Electron Energy ◽  
Computer Modelling ◽  
Rotational Temperature ◽  
Temperature Variations ◽  
Morphological Studies ◽  
Modelling Techniques ◽  
Rocket Measurements

A ground-based, two channel photometer was used to derive rotational temperatures for the 4278 Å band of N2+ during the 1980 Canadian pulsating aurora campaign. Characteristic electron energies of a Maxwellian energy distribution were inferred from the rotational temperatures using computer modelling techniques. Height and electron energy fluctuations, calculated for a pulsating auroral event on February 15, 1980, are compared with ground-based ionosonde and in situ rocket measurements. The results indicate the potential of conducting electron energy morphological studies from the ground. Systematic rotational temperature variations were found to accompany each of the well-defined pulsations studied.

The electrophysiology of the somatic muscle cells of Ascaris suum and Ascaridia galli

Parasitology ◽  
1987 ◽  
Vol 94 (3) ◽  
pp. 555-566 ◽  
Author(s):  
K. T. Wann
Keyword(s):  
Large Amplitude ◽  
Action Potentials ◽  
Ascaris Suum ◽  
Muscle Cells ◽  
Ascaridia Galli ◽  
Somatic Muscle ◽  
Temperature Variations ◽  
Electrophysiological Properties ◽  
The Mean ◽  
Input Conductance

The electrophysiological properties of the bag region of the somatic muscle cells of Ascaris suum and Ascaridia galli were studied using intracellular techniques. For Ascaris muscle cells, the mean resting membrane potentials at 20 and 37°C were −29·9 and −33·8 mV respectively, and the average input conductance was 2·12 μS. For the muscle cells of A. galli similar values were obtained. For example, the mean input conductance of these cells was 2·84 μS at 20°C. Healthy Ascaris muscle cells at near physiological temperatures show both spontaneous depolarizing and hyperpolarizing activity and, in cells close to the nerve cords, rhythmic large amplitude (approximately 30 mV) action potentials are observed. Such action potentials, which are very sensitive to temperature variations, originate in the muscle cells. In contrast the muscle cells of Ascaridia are quiescent. The rhythmic action potentials of Ascaris are resistant to tetrodotoxin (TTX) (≤ 10−6 M), verapamil (10−4 M) and cinnarizine (10−4 M), but are blocked irreversibly by 22, 23 dihydroavermectin B1a (10−7 to 5 × 10−6 M). GABA, and the GABAA receptor agonists, muscimol and isoguvacine, hyperpolarize and increase the input conductance of both Ascaris and Ascaridia muscle cells. The antagonists+bicuculline and picrotoxin were not effective in modulating the spontaneous hyper polarizations of Ascaris muscle cells, and picrotoxin (10−4 M) was not effective in altering the response to GABA (5 × 10−6 M). The significance of the results is discussed briefly.

81Br and 127I NQR and Phase Transitions in CH3NH3 HgBr3 and CH3NH3 HgI3

1990 ◽  
Vol 45 (3-4) ◽  
pp. 343-348 ◽  
Author(s):  
Hiromitsu Terao ◽  
Tsutomu Okuda
Keyword(s):  
Phase Transition ◽  
Phase Transitions ◽  
Large Amplitude ◽  
Molecular Motions ◽  
Temperature Variations ◽  
Halogen Atoms ◽  
Resonance Frequencies ◽  
Successive Phase

Abstract The 81Br and 127I NQR spectra were recorded in CH3NH3 HgBr3 and CH3NH HgI3 , respectively. In addition to a phase transition at 338 K, successive phase transitions take place at 127 ± 1, 184±1 and 243±5 K in CH3NH3 HgBr3. On heating, the resonance lines of CH3NH3HgI3 disappear near a phase transition at 328 K and one line appears above this temperature. The temperature variations of the resonance frequencies of the terminal halogen atoms in both crystals are extraordinarily steep. This indicates the large amplitude molecular motions expected for the CH3NH3 cations which are linked to the terminal halogen atoms through N-H ··· X type H-bonding.

Intermittent chaos in the Bray–Liebhafsky oscillator. Temperature dependence

2016 ◽  
Vol 18 (14) ◽  
pp. 9770-9778 ◽  
Author(s):  
I. N. Bubanja ◽  
S. Maćešić ◽  
A. Ivanović-Šašić ◽  
Ž. Čupić ◽  
S. Anić ◽  
...  
Keyword(s):  
Temperature Dependence ◽  
Large Amplitude ◽  
Small Amplitude ◽  
Relaxation Oscillations ◽  
Temperature Variations ◽  
Intermittent Chaos

Intermittent oscillations as a chaotic mixture of large amplitude relaxation oscillations, grouped in bursts and small-amplitude sinusoidal ones or even quiescent parts between them known as gaps, were found and examined in the Bray–Liebhafsky (BL) reaction performed in CSTR under controlled temperature variations.

Large-amplitude semidiurnal temperature variations in the polar mesopause: evidence of a pseudotide

Nature ◽  
1986 ◽  
Vol 324 (6095) ◽  
pp. 347-349 ◽  
Author(s):  
R. L. Walterscheid ◽  
G. G. Sivjee ◽  
G. Schubert ◽  
R. M. Hamwey
Keyword(s):  
Large Amplitude ◽  
Temperature Variations
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