scholarly journals Galactic Radio Emission Below 16·5 MHz and the Galactic Emission Measure

1982 ◽  
Vol 35 (1) ◽  
pp. 91 ◽  
Author(s):  
GRA Ellis
Keyword(s):  
Radio Emission ◽  
Emission Measure ◽  
Kinetic Temperature ◽  
The South ◽  
Radio Brightness ◽  
Galactic Emission ◽  
Galactic Radio Emission ◽  
Galactic Radio ◽  
Galactic Background

New maps of the distribution of the galactic background radio emission are given for wave frequencies of 2�1,3�7,4�7,5�5,8�3,13 and 16�5 MHz. The angular resolutions of the observations were 7.5�, 6.8�, 3 � � 10�, 4.5�, 3.0�, 1.9� and 1.5� respectively. A map of the quantity ?? in galactic coordinates is obtained from an analysis of the changes in the radio brightness distributions with frequency. For an assumed electron kinetic temperature of 104 K, the emission measure is found to vary from 3�9 cm -6 pc near the south galactic pole to 140 cm -6 pc near the equator.

A 1· 6 MHz Survey of the Galactic Background Radio Emission

1987 ◽  
Vol 40 (5) ◽  
pp. 705 ◽  
Author(s):  
GRA Ellis ◽  
M Mendillo
Keyword(s):  
Solar Activity ◽  
Radio Emission ◽  
Radio Telescope ◽  
Radiation Intensity ◽  
Beam Width ◽  
Solar Activity Minimum ◽  
Galactic Radio Emission ◽  
Galactic Radio ◽  
Galactic Background

Observations of the galactic radio emission at 1 �6 MHz have been made during the current solar activity minimum using a radio telescope with a beam width of 25�. The radiation intensity was mapped for six declinations between _12� and _72� and from 1000 to 0500 hours R.A.

scholarly journals Observations of the galactic radio emission between 1.5 and 10 MHz from the Alouette Satellite

1965 ◽  
Vol 23 ◽  
pp. 319-326
Author(s):  
T. R. Hartz
Keyword(s):  
Radio Emission ◽  
Local Electron ◽  
Frequency Curve ◽  
Sweep Frequency ◽  
The Earth ◽  
Galactic Emission ◽  
The Galaxy ◽  
Noise Measurements ◽  
Galactic Radio Emission ◽  
Galactic Radio

Since September 29, 1962, a sweep-frequency receiver covering the range 0.5 to 12 MHz has been operating in a 1000 km height, 80.5° inclination orbit about the earth for about 5 hours a day on the average. Only a very small portion of the data has yet been analyzed, and from this the spectrum of the galactic radio emission between 1.5 and 5 MHz has been determined fairly reliably, but it has not been possible from these data to extend this up to 10 MHz with any accuracy. Although there is no provision for absolute gain calibration of the receiver in flight, the data are so consistent as to give confidence to the pre-flight calibration. The greatest uncertainty hinges on the effects of the ionization on the antenna impedances. To evaluate these, galactic noise measurements have been made under a variety of local electron densities and different magnetic field strengths : these values have then been extrapolated to zero electron density and the free space values obtained by this extrapolation procedure are taken as a measure of the galactic emission. At 2.3 MHz the brightest region of the galaxy is centred on the south galactic pole and has a temperature of about 1.8 × 107 °K. The lowest temperature, about 5.0 × 106 °K, at 2.3 MHz was found for the region centred on R. A. 9 hr., dec + 75°. At this same frequency the brightness temperature versus frequency curve has a elope of — 1.7; at 1.5 MHz the slope is — 1.3 and at 5.0 MHz the slope is — 2.2.

Site evaluation and RFI spectrum measurements in Portugal at the frequency range 0.408–10GHz for a GEM polarized galactic radio emission experiment

New Astronomy ◽  
2006 ◽  
Vol 11 (8) ◽  
pp. 551-556 ◽  
Author(s):  
Rui Fonseca ◽  
Domingos Barbosa ◽  
Luis Cupido ◽  
Ana Mourão ◽  
Dinis M. dos Santos ◽  
...  
Keyword(s):  
Radio Emission ◽  
Frequency Range ◽  
Spectrum Measurements ◽  
Site Evaluation ◽  
Galactic Radio Emission ◽  
Galactic Radio

scholarly journals TRIS. III. The Diffuse Galactic Radio Emission at δ = +42°

2008 ◽  
Vol 688 (1) ◽  
pp. 32-42 ◽  
Author(s):  
A. Tartari ◽  
M. Zannoni ◽  
M. Gervasi ◽  
G. Boella ◽  
G. Sironi
Keyword(s):  
Radio Emission ◽  
Galactic Radio Emission ◽  
Galactic Radio
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