Abstract
We study the influence of the large-scale interplanetary magnetic field configuration on the solar energetic particles (SEPs) as detected at different satellites near Earth and on the correlation of their peak intensities with the parent solar activity. We selected SEP events associated with X- and M-class flares at western longitudes, in order to ensure good magnetic connection to Earth. These events were classified into two categories according to the global interplanetary magnetic field (IMF) configuration present during the SEP propagation to 1 AU: standard solar wind or interplanetary coronal mass ejections (ICMEs). Our analysis shows that around 20 % of all particle events are detected when the spacecraft is immersed in an ICME. The correlation of the peak particle intensity with the projected speed of the SEP-associated coronal mass ejection is similar in the two IMF categories of proton and electron events, ≈ 0.6. The SEP events within ICMEs show stronger correlation between the peak proton intensity and the soft X-ray flux of the associated solar flare, with correlation coefficient r=0.67±0.13, compared to the SEP events propagating in the standard solar wind, r=0.36±0.13. The difference is more pronounced for near-relativistic electrons. The main reason for the different correlation behavior seems to be the larger spread of the flare longitude in the SEP sample detected in the solar wind as compared to SEP events within ICMEs. We discuss to what extent observational bias, different physical processes (particle injection, transport, etc.), and the IMF configuration can influence the relationship between SEPs and coronal activity.
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Notes
GOES X-ray classification in the 1 – 8 Å channel: M-class flares have peak flux that exceeds 10−5 W m−2, whereas the X-class flares are 10 times more intense.
Estimating transport effects from rise times is valid under the assumption of a single, short in time particle injection.
For the Wind/EPACT proton data we obtain 22∘±13∘ (20∘±8∘ in absolute values) for the ICME events and − 6∘±20∘ (14∘±11∘ in absolute values) for the SoWi events.
Note that the r 2-values of the correlation coefficients found in the present study (and also in earlier work) are usually r 2≲0.5.
Note that five of the eight events in the SoWi category with projected speed below 600 km s−1 occurred near the central meridian.
Proton fluence could not be estimated for three events in the SoWi category.
Electron fluence could not be estimated for one (four) events in the ICME (SoWi) category.
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Acknowledgements
The authors acknowledge D. Boscher (ONERA Toulouse) for making the IPODE database of GOES particle measurements available to us. We also thank T. Dudok de Wit, M. Temmer, G. Trottet, H. Reid, and A. Veronig for helpful discussions and the referee for her/his comments. R.M. acknowledges a post-doctoral fellowship by Paris Observatory. The CME catalog is generated and maintained at the CDAW Data Center by NASA and The Catholic University of America in cooperation with the Naval Research Laboratory. SOHO is a project of international cooperation between ESA and NASA.
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Appendix
Appendix
Tables 4 – 6 summarize all data used in the paper, organized in different IMF categories, namely ICME, SoWi and SEP events in the vicinity of an ICME (Section 3.1). The events in each table are listed chronologically: The event date is given in column (1). The proton and electron peak intensities (with their onset time) follow in columns (2) – (5). The next four columns give the SXR peak flux (with the onset time), the flare position on the western (W) hemisphere, the projected CME speed and the angular width (AW), as reported in catalogs or from previous work. The data sources are explained in detail in the footnotes under each table. In column (10) we give the temporal offset between the GOES SEP start (or at Wind at 1 AU) and the nearest-in-time boundary of the ICME (shifted at GOES orbit or as observed at 1 AU). This value is used as a confidence check for the identification of the IMF category. Although we used exclusively the timings of the ICME boundaries as reported in Richardson and Cane (2010), differences might exist with other ICME lists due to different definition used for an ICME, variation in the IMF data from different satellites and also due to the subjectivity of the observer. In the ICME category (Table 4) two events are relatively close (about 2 h) to the reported ICME onset and may change category after a detailed analysis. All other events in this category are well within the body of the ICME. Similarly for the last SEP category (Table 6), some SEP events might be propagating in quiet solar wind conditions, although many are in the sheath region of the ICME or occur only several hours before or after the ICME boundary. Rise times are given in column (11) in Tables 4 and 5. Finally, in the last two columns in each table the solar wind speed (averaged values) and the connection distance are given.
The linear regression between the logI SXR–logV CME is given in Table 11 and the dependencies between logJ max and the logarithms of the parameters of coronal activity are summarized in Table 12.
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Miteva, R., Klein, KL., Malandraki, O. et al. Solar Energetic Particle Events in the 23rd Solar Cycle: Interplanetary Magnetic Field Configuration and Statistical Relationship with Flares and CMEs. Sol Phys 282, 579–613 (2013). https://doi.org/10.1007/s11207-012-0195-2
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DOI: https://doi.org/10.1007/s11207-012-0195-2