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Title: Radio burst characteristics of solar proton flares

Abstract

To isolate the properties of solar radio bursts indicative of energetic (E>20 MeV) proton acceleration, we compare several groups of solar bursts. Intense centimetric bursts and metric type II bursts associated with solar flares at magnetically well-connected longitudes, but not resulting in detected prompt proton events, are compared with the radio bursts of proton flares. The type II bursts not associated with proton flares are distinguished from those of proton flares by their short durations, associations with small H..cap alpha.. flares, and lack of associated type IV metric bursts. We find that, contrary to the claim of Svestka and Fritzova-Svestkova, the appearance of a type II burst, indicating a coronal shock, is not a sufficient condition for the occurrence of an interplanetary proton event. We further conclude that interplanetary energetic protons are not significantly produced in most type II burst shocks. The centimetric bursts were examined in detail using records from the Sagamore Hill Observatory. The distinguishing difference between the proton and nonproton centimetric bursts is that the proton-event burst durations ranged from 1 minute to 1 hour, but the burst durations of nonproton flares were less than 10 minutes. We argue that energetic electrons produced in postflare loop systemsmore » are the sources of the stationary metric and decimetric type IV bursts associated with proton flares.« less

Authors:
Publication Date:
Research Org.:
Air Force Geophysics Laboratory, Hanscom Air Force Base, Massachusetts
OSTI Identifier:
6527326
Resource Type:
Journal Article
Journal Name:
Astrophys. J.; (United States)
Additional Journal Information:
Journal Volume: 261:2
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; SOLAR RADIO BURSTS; SOLAR PROTONS; DATA ANALYSIS; INTERPLANETARY SPACE; MAGNETIC FIELDS; PLASMA ACCELERATION; SHOCK WAVES; SOLAR FLARES; ACCELERATION; BARYONS; ELECTROMAGNETIC RADIATION; ELEMENTARY PARTICLES; FERMIONS; HADRONS; NUCLEONS; PROTONS; RADIATIONS; RADIOWAVE RADIATION; SOLAR ACTIVITY; SOLAR PARTICLES; SOLAR RADIATION; SPACE; STELLAR RADIATION; 640104* - Astrophysics & Cosmology- Solar Phenomena

Citation Formats

Kahler, S W. Radio burst characteristics of solar proton flares. United States: N. p., 1982. Web. doi:10.1086/160381.
Kahler, S W. Radio burst characteristics of solar proton flares. United States. https://doi.org/10.1086/160381
Kahler, S W. 1982. "Radio burst characteristics of solar proton flares". United States. https://doi.org/10.1086/160381.
@article{osti_6527326,
title = {Radio burst characteristics of solar proton flares},
author = {Kahler, S W},
abstractNote = {To isolate the properties of solar radio bursts indicative of energetic (E>20 MeV) proton acceleration, we compare several groups of solar bursts. Intense centimetric bursts and metric type II bursts associated with solar flares at magnetically well-connected longitudes, but not resulting in detected prompt proton events, are compared with the radio bursts of proton flares. The type II bursts not associated with proton flares are distinguished from those of proton flares by their short durations, associations with small H..cap alpha.. flares, and lack of associated type IV metric bursts. We find that, contrary to the claim of Svestka and Fritzova-Svestkova, the appearance of a type II burst, indicating a coronal shock, is not a sufficient condition for the occurrence of an interplanetary proton event. We further conclude that interplanetary energetic protons are not significantly produced in most type II burst shocks. The centimetric bursts were examined in detail using records from the Sagamore Hill Observatory. The distinguishing difference between the proton and nonproton centimetric bursts is that the proton-event burst durations ranged from 1 minute to 1 hour, but the burst durations of nonproton flares were less than 10 minutes. We argue that energetic electrons produced in postflare loop systems are the sources of the stationary metric and decimetric type IV bursts associated with proton flares.},
doi = {10.1086/160381},
url = {https://www.osti.gov/biblio/6527326}, journal = {Astrophys. J.; (United States)},
number = ,
volume = 261:2,
place = {United States},
year = {Fri Oct 15 00:00:00 EDT 1982},
month = {Fri Oct 15 00:00:00 EDT 1982}
}