Intermediate-Term Periodicities in Soft X-ray Flare Index During Solar Cycles 21, 22 and 23
نویسندگان
چکیده
منابع مشابه
Periodicities in Solar Flare Occurrence: Analysis of Cycles 19–23
Mid-range periodicities in solar flare occurrence have been analyzed with new methods for cycles 19–23. During cycle 23, periodicities of 129-d and 33.5-d were in operation. Five episodes of high activity occurred periodically with the 129-d period. The 33.5-d periodicity mainly operated for energetic flares. Results for cycles 19–21 are generally in agreement with previous analyses. For cycle ...
متن کاملThe North−south Asymmetry of Soft X- Ray Flare Index during Solar Cycles
In this paper the N−S asymmetry of the soft X-ray flare index (FISXR) during the solar cycles 21, 22 and 23 has been analyzed. The results show the existence of a real N−S asymmetry which is strengthened during solar minimum. The slope of the regression lines fitted to the daily values of asymmetry time series has been found to be negative in all the three cycles. The yearly asymmetry curve can...
متن کاملRegularized Energy-dependent Solar Flare Hard X-ray Spectral Index
The deduction from solar flare X-ray photon spectroscopic data of the energy dependent model-independent spectral index is considered as an inverse problem. Using the well developed regularization approach we analyze the energy dependency of spectral index for a high resolution energy spectrum provided by Ramaty High Energy Solar Spectroscopic Imager (RHESSI). The regularization technique produ...
متن کاملSolar Flare Cycles
We present a review of different solar flare periodicity intervals. Our analysis includes a statistical investigation of flare occurrence and N-S hemispheric distribution over the last three 11-yr solar cycles (SCs 21-23, corresponding to the period 1976-2001). Moreover, we try to estimate if there is any connection between the flare activity and the strength of solar cycles. For that purpose, ...
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...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Solar Physics
سال: 2005
ISSN: 0038-0938,1573-093X
DOI: 10.1007/s11207-005-5716-9