The electron temperature distribution of laser erosion plume after ablation of a tantalum target with excimer laser in vacuum

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.

Download Full-text

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

Astrophysics and Space Science ◽

10.1007/bf00651034 ◽

1969 ◽

Vol 3 (2) ◽

pp. 292-300 ◽

Cited By ~ 1

Author(s):

Victor Mansfield

Keyword(s):

Temperature Distribution ◽

Electron Temperature ◽

Hii Regions ◽

Radio Measurements

Download Full-text

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

Solnechno-Zemnaya Fizika ◽

10.12737/19424 ◽

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.

Download Full-text