منابع مشابه
Statistical characterisation of full-disk EUV/XUV solar irradiance and correlation with solar activity
We investigate the distribution of fluctuations in solar irradiance when integrated over the full disk, obtained using extreme ultraviolet/soft X-ray observations from the SOHO CELIAS/SEM instrument. This time series sums over both the contributions of single distinguishable flares, and of many other processes. By detrending we select events with timescales of less than a few hours such as wave...
متن کاملEvidence for power-law distributions of total EUV/XUV solar irradiance that correlate with solar activity
The identification of flares in solar datasets implies using a thresholding process which excludes the majority of low-emission regions. In this paper we investigate a different measure of solar emission: the distribution of the total solar irradiance when integrated over the disk, obtained using extreme ultraviolet/soft X-ray observations from the SOHO CELIAS/SEM instrument. We show that durin...
متن کاملUltrafast XUV emission from laser wakefields in underdense plasma
It is shown that a laser wakefield driven in the highly nonlinear regime or the wave-breaking regime in underdense plasma can emit ultrabroad-band bright extreme ultraviolet (XUV) radiation pulses, which are as short as a few hundreds of attoseconds in one-dimensional simulations and a few femtoseconds in multi-dimensional cases. The emission is caused by a transverse current sheet co-moving wi...
متن کاملIx. Solar Radio Emission
The emission of solar flares at millimeter wavelengths is of great interest both in its own right and because it is generated by the energetic electrons which also emit gamma rays. Since high-resolution imaging at gamma-ray energies is not presently possible, millimeter observations can act as a substitute. Except for that class of flares known as gamma-ray flares the millimetric emission is op...
متن کاملStatistical Modeling of Solar Flare Activity from Empirical Time Series of Soft X-ray Solar Emission
A time series of soft X-ray emission observed on 1974-2007 years (GOES) is analyzed. We show that in the periods of high solar activity 1977-1981, 19881992, 1999-2003 the energy statistics of soft X-ray solar flares for class M and C is well described by a FARIMA time series with Pareto innovations. The model is characterized by two effects. One of them is a long-range dependence (longterm memo...
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 1973
ISSN: 0035-8711,1365-2966
DOI: 10.1093/mnras/161.2.181