Investigation of the Cyclotron Harmonic Radiation from a Plasma in a Magnetic Field

1966 ◽  
Vol 21 (4) ◽  
pp. 383-390
Author(s):  
Eberhard Räuchle ◽  
Walther Hess
Keyword(s):  
Magnetic Field ◽  
Radiation Intensity ◽  
Pressure Range ◽  
Positive Column ◽  
Longitudinal Magnetic Field ◽  
Microwave Emission ◽  
Harmonic Radiation ◽  
Pressure Discharge ◽  
Cyclotron Harmonic ◽  
Theory And Experiment

The microwave emission of the positive column of a low pressure discharge in a magnetic field is investigated by means of a 10 000 Mc/sec radiometer. The radiation intensity as a function of the longitudinal magnetic field shows a number of peaks near the electron cyclotron harmonic frequencies. The measurements are performed for noble gases in the pressure range from 10 to 10-2 Torr at electron densities varying from 109 to 1013 cm-3. In order to compare the experimental results with a theoretical investigation performed by one of the authors12, the emission of harmonics was observed in dependence on the electron density. A satisfactory agreement between theory and experiment is shown.

The Internal Magnetic Field of the Positive Column in a Longitudinal Magnetic Field

1975 ◽  
Vol 38 (1) ◽  
pp. 295-295
Author(s):  
Yoji Nagai ◽  
Shinogo Imazu ◽  
Takesuke Maruyama ◽  
Takeo Maruyama
Keyword(s):  
Magnetic Field ◽  
Positive Column ◽  
Longitudinal Magnetic Field ◽  
Internal Magnetic Field

scholarly journals Analysis of EUV, Microwave, and Magnetic Field Observations of Solar Plage

1993 ◽  
Vol 141 ◽  
pp. 291-294
Author(s):  
J W Brosius ◽  
J M Davila ◽  
H P Jones ◽  
W T Thompson ◽  
R J Thomas ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Longitudinal Magnetic Field ◽  
Emission Measure ◽  
Plasma Temperature ◽  
Microwave Emission ◽  
Plasma Parameters ◽  
Very Large Array ◽  
Hot Plasma ◽  
Iron Abundance ◽  
Bremsstrahlung Emission

AbstractWe obtained simultaneous images of solar plage on 7 May 1991 with Goddard Space Flight Center’s Solar EUV Rocket Telescope and Spectrograph (SERTS), the Very Large Array (VLA), and the NASA/NSO spectromagnetograph at Kitt Peak. Using intensity ratios of Fe XVI to Fe XV emission lines, we find that the coronal plasma temperature is 2.5 ± 0.3 ×lO6 K throughout the region. The column emission measure ranges from 2.6 × 1027 to 1.3 × 1028 cm−5. The calculated structure and intensity of the 20 cm wavelength thermal bremsstrahlung emission from the hot plasma observed by SERTS is quite similar to the observed structure and intensity of the 20 cm microwave emission observed by the VLA. Using the revised coronal iron abundance of Meyer (1991, 1992), we find no evidence for either cool absorbing plasma or for contributions from thermal gyroemission. Combining the observed microwave polarization and the SERTS plasma parameters, we calculate a map of the coronal longitudinal magnetic field. The resulting values, ~ 30 – 60 Gauss, are comparable to extrapolated values of the potential field at heights of 5,000 and 10,000 km.

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