An electron temperature distribution derived from optical and radio measurements of HII regions

1969 ◽  
Vol 3 (2) ◽  
pp. 292-300 ◽  
Author(s):  
Victor Mansfield
Keyword(s):  
Temperature Distribution ◽  
Electron Temperature ◽  
Hii Regions ◽  
Radio Measurements

A photographic method for in-orbit measurement of electron temperature distribution in the plume of Hall thrusters

2018 ◽  
Vol 27 (8) ◽  
pp. 084002 ◽  
Author(s):  
Li-Qiu Wei ◽  
Wen-Bo Li ◽  
Yong-Jie Ding ◽  
Xi-Ming Zhu ◽  
Yan-Fei Wang ◽  
...  
Keyword(s):  
Temperature Distribution ◽  
Electron Temperature ◽  
Photographic Method ◽  
Hall Thrusters

scholarly journals The Temperature Structure of NGC 7027

1989 ◽  
Vol 131 ◽  
pp. 176-176
Author(s):  
C. T. Daub ◽  
J. P. Basart
Keyword(s):  
Temperature Distribution ◽  
Electron Temperature ◽  
Angular Resolution ◽  
Hot Spot ◽  
Emission Measure ◽  
The Other ◽  
Radio Continuum ◽  
Line Of Sight ◽  
Temperature Structure ◽  
Ngc 7027

Radio maps of the free-free radio continuum flux (angular resolution ≅ 1.3 arcseconds) from NGC 7027 were made with the VLA operating at 20-cm, 6-cm, and 2-cm wavelengths which are near and straddle unit optical depth. Mean line-of-sight electron temperature and emission measure distributions were calculated by pairing the 2-cm and 6-cm maps, and the electron temperature distribution on the near side of the nebula was then obtained from the 20-cm map. The results suggest that the energy balance is complex in this planetary. For example, mean line-of-sight temperatures are higher than average in the direction of one of the bright lobes but not in the direction of the other. Especially noteworthy is an apparent “hot spot” on the near side of the nebula which has no apparent relation to either of the bright lobes, but it is approximately coincident with the brightest portion of the optical image.

scholarly journals Modeling the electron temperature distribution in F2 region of high-latitude ionosphere for winter solstice conditions

2016 ◽  
Vol 2 (4) ◽  
pp. 54-62
Author(s):  
Иннокентий Голиков ◽  
Innokentiy Golikov ◽  
Артем Гололобов ◽  
Artem Gololobov ◽  
Василий Попов ◽  
...  
Keyword(s):  
Temperature Distribution ◽  
Electron Temperature ◽  
High Latitude ◽  
Temporal Distribution ◽  
Universal Time ◽  
Western Hemisphere ◽  
Three Dimensional Model ◽  
Winter Solstice ◽  
Eastern Hemisphere ◽  
High Latitude Ionosphere

Using the three-dimensional model of the high-latitude ionosphere in Euler variables, which takes into account the mismatch between geographical and geomagnetic poles, we study the behavior of the electron temperature Te in the F2 region as a function of universal time. We present results of the numerical modeling of spatial-temporal distribution of electron temperature in the F2 region for winter solstice, minimum solar activity, and moderate geomagnetic activity. The electron temperature distribution in the F2 region of the high-latitude ionosphere in winter is shown to be characterized by a Te increase in dawn and dusk sectors. Further, the mismatch between the poles leads to regular longitudinal features in Te distribution during Earth’s daily rotation. Thus, at 05 UT, when the Eastern Hemisphere is illuminated, the elevated Te zone is formed only in the dawn sector, and at 17 UT, when the Western Hemisphere is illuminated, such zones are observed in both the sectors. We discuss reasons for the formation of the regions with elevated electron temperature depending on the universal time. The results of numerical experiments are compared with similar results obtained with other models.

scholarly journals Classification of Supernova Remnants and HII Regions from their Recombination Line Emission

1972 ◽  
Vol 25 (5) ◽  
pp. 539 ◽  
Author(s):  
JR Dickel ◽  
DK Milne
Keyword(s):  
Electron Temperature ◽  
Supernova Remnants ◽  
Line Emission ◽  
Hii Regions ◽  
Radio Sources ◽  
Recombination Line ◽  
Line Frequency ◽  
Upper Limits ◽  
Galactic Radio

H109a, recombination line observations are used in an attempt to classify 46 galactic radio sources as either supernova remnants or HII regions. Long integrations at the H109a line frequency on two well-known supernova remnants (IC 443 and 3C 391) provide improved upper limits on the line emission from these objects. From these results the electron temperature in IC 443 is estimated to be in excess of 1�6 � 104 K.

scholarly journals Optical HII regions

1979 ◽  
Vol 84 ◽  
pp. 65-72 ◽  
Author(s):  
Y. M. Georgelin ◽  
Y. P. Georgelin ◽  
J.-P. Sivan
Keyword(s):  
Electron Temperature ◽  
Spiral Galaxies ◽  
Emission Measure ◽  
Hii Regions ◽  
Nuclear Region ◽  
Diffuse Emission

The ionized hydrogen regions seen on monochromatic Hα photographs of nearby spiral galaxies (e.g. Fig. 1) can be divided into four classes (Monnet, 1971): (1) bright, condensed, classical HII regions; (2) diffuse emission in the arms surrounding and connecting the classical regions (emission measure (EM) ∼ 150 cm−6 pc, for a gas electron temperature of 6000 K); (3) much fainter, diffuse emission extending over the entire disk (EM ∼ 50 cm−6 pc) in most Sc and Sd galaxies; (4) diffuse emission in the nuclear region.

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