Jupiter's low-frequency radio spectrum from Cassini/Radio and Plasma Wave Science (RPWS) absolute flux density measurements

2004 ◽  
Vol 109 (A9) ◽  
Author(s):  
P. Zarka
Keyword(s):  
Flux Density ◽  
Plasma Wave ◽  
Low Frequency ◽  
Radio Spectrum ◽  
Density Measurements ◽  
Absolute Flux

scholarly journals Evolution of the Radio Emission from Young SNRs according to Observational Data

1979 ◽  
Vol 32 (2) ◽  
pp. 95 ◽  
Author(s):  
KS Stankevich
Keyword(s):  
Experimental Data ◽  
Radio Emission ◽  
Flux Density ◽  
Observational Data ◽  
Spectral Index ◽  
Density Measurements ◽  
The Past ◽  
Absolute Flux ◽  
Density Decrease ◽  
Frequency Variations

Results are given from a still-continuing series of absolute flux density measurements for the SNR CasA. The measurements have been taken regularly over the past 16 years at 24 wavelengths in the range 3-60 cm. New data are presented for the rate of flux density decrease, and for time and frequency variations in the spectral index. Intensity increases that are localized in frequency are described. The results are generalized in a model for the radio emission from a young SNR, and this is used to analyse experimental data for flux density decreases in the emission from 3C 10 and 58.

scholarly journals A LOFAR census of non-recycled pulsars: extending to frequencies below 80 MHz

2020 ◽  
Vol 635 ◽  
pp. A75 ◽  
Author(s):  
A. V. Bilous ◽  
L. Bondonneau ◽  
V. I. Kondratiev ◽  
J.-M. Grießmeier ◽  
G. Theureau ◽  
...  
Keyword(s):  
Flux Density ◽  
Low Frequency ◽  
Spectral Indices ◽  
Low Frequencies ◽  
Density Measurements ◽  
High Band

We present the results from the low-frequency (40–78 MHz) extension of the first pulsar census of non-recycled pulsars carried out with the LOw-Frequency ARray (LOFAR). We used the low-band antennas of the LOFAR core stations to observe 87 pulsars out of 158 that had been previously detected using high-band antennas. We present flux densities and flux-calibrated profiles for the 43 pulsars we detected. Of this sample, 17 have not, to our knowledge, previously been detected at such low frequencies. Here we recalculate the spectral indices using the new low-frequency flux density measurements from the LOFAR census and discuss the prospects of studying pulsars at very low frequencies using current and upcoming facilities, such as the New Extension in Nançay Upgrading LOFAR (NenuFAR).

scholarly journals Low-frequency Flux Density Measurements and Pulsars with GHz-peaked Spectra

2021 ◽  
Vol 923 (2) ◽  
pp. 211
Author(s):  
J. Kijak ◽  
R. Basu ◽  
W. Lewandowski ◽  
K. Rożko
Keyword(s):  
Flux Density ◽  
High Frequency ◽  
Supernova Remnant ◽  
Low Frequency ◽  
Physical Parameters ◽  
Absorption Model ◽  
Pulsar Wind Nebulae ◽  
Entire Sample ◽  
Density Measurements ◽  
Pulsar Wind

Abstract We have estimated flux densities of several pulsars from radio interferometric observations mainly at 325 MHz using the Giant Metrewave Radio Telescope. The new observations allowed us to update the spectral nature of the observed pulsars, and in six sources we identified relatively high frequency turnovers, which can be classified as new GHz-peaked spectrum (GPS) pulsars. For such objects the turnover in the spectrum is most likely caused by absorption in the immediate vicinity of the pulsar (or in the interstellar medium). We modeled the turnover spectra using the thermal free–free absorption model and the physical parameters obtained from the fits enabled us to identify the environments that could potentially be responsible for the observed absorption, such as pulsar wind nebulae, supernova remnant nebulae or H ii regions. The discovery of 6 new GPS pulsars brings the total number of such objects to 33 and we discuss the properties of the entire sample.

A thermoelectric device for ophthalmic heat flux density measurements: results of piloting in healthy individuals

2019 ◽  
Vol 80 (3) ◽  
pp. 45-51
Author(s):  
L. Anatychuk ◽  
N. Pasyechnikova ◽  
V. Naumenko ◽  
O. Zadorozhnyy ◽  
R. Kobylianskyi ◽  
...  
Keyword(s):  
Heat Flux ◽  
Flux Density ◽  
Heat Flux Density ◽  
Thermoelectric Device ◽  
Healthy Individuals ◽  
Density Measurements
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