Fourier Power Spectra of Solar Noise Storms View Full Text


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Article Info

DATE

2018-10

AUTHORS

Marian Karlický, Ján Rybák, Christian Monstein

ABSTRACT

We analyzed three noise storms recorded on 200 – 400 MHz Trieste Callisto radio spectra on 2 July 2012, 8 July 2012, and 16 July 2012 by the Fourier method. We divided intervals of the noise storms into five-minute intervals, and in these intervals we computed the mean Fourier spectra as a function of the wave numbers in the frequency and height-scale spaces. We found that these Fourier spectra, where the spectrum from the quiet-activity interval was subtracted, are power-law spectra. The mean power-law index of these spectra in the range ln(kz)=[1.8,2.9] (where kz is the wave number in the height-scale space) is −1.7±0.14, −1.6±0.14, and −1.5±0.12 for the 2 July 2012, the 8 July 2012, and the 16 July 2012 noise storms, respectively. It appears that as the number of Type-I bursts in the studied interval increases, the power-law index becomes closer to −5/3; this is known as the Kolmogorov spectral index. The power-law index of the noise storms is very similar to that of the narrowband dm-spikes found in our previous studies. Furthermore, we found a break in the power spectra at ln(kz)≈2.9, and the mean power-law index values above this break are −2.9±0.46, −3.1±0.65, and −3.4±0.98, respectively. More... »

PAGES

143

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/s11207-018-1367-5

DOI

http://dx.doi.org/10.1007/s11207-018-1367-5

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1107687976


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