Physics
Scientific paper
Nov 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996soph..169..181k&link_type=abstract
Solar Physics, Volume 169, Issue 1, pp.181-207
Physics
11
Scientific paper
A joint analysis of neutron monitor and GOES data is performed to study the production of high-energy neutrons at the Sun. The main objects of the research are the spectrum of >50 MeV neutrons and a possible spectrum of primary (interacting) protons which produced those neutrons during the major 1990 May 24 solar flare. Different possible scenarios of the neutron production are presented. The high magnitude of the 1990 May 24 neutron event provided an opportunity to detect neutron decay protons of higher energies than ever before. We compare predictions of the proposed models of neutron production with the observations of protons on board GOES 6 and 7. It is shown that the ‘precursor’ in high-energy GOES channels observed during 20:55 21:09 UT can be naturally explained as originating from decay of neutrons in the interplanetary medium. The ratio of counting rates observed in different GOES channels can ensure the selection of the model parameters. The set of experimental data can be explained in the framework of a scenario which assumes the existence of two components of interacting protons in the flare. A hard spectrum component (the first component) generates neutrons during a short time while the interaction of the second (soft spectrum) component lasts longer. Alternative scenarios are found to be of lesser likelihood. The intensity-time profile of neutron - decay protons as predicted in the framework of the two-component exponential model of neutron production (Kocharov et al., 1994a) is in an agreement with the proton profiles observed on board GOES. We compare the deduced characteristics of interacting high-energy protons with the characteristics of protons escaping into the interplanetary medium. It is shown that, in the 100 1000 MeV range, the spectrum of the second component of interacting protons was close to the spectrum of the prompt component of interplanetary protons. However, it is most likely that, at ˜300 MeV, the interacting proton spectrum was slightly softer than the spectrum of interplanetary protons. An analysis of gamma-ray emission is required to deduce the spectrum of interacting protons below 100 MeV and above 1 GeV.
Kocharov Leon G.
Kovaltsov Gennadi A.
Torsti Jarmo
Usoskin Ilya G.
Vainio Rami
No associations
LandOfFree
A Joint Analysis of High-Energy Neutrons and Neutron-Decay Protons from a Flare does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with A Joint Analysis of High-Energy Neutrons and Neutron-Decay Protons from a Flare, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and A Joint Analysis of High-Energy Neutrons and Neutron-Decay Protons from a Flare will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1752750