Peak-flux-density spectra of large solar radio bursts and proton emission from flares. Environmental research papers, July 1981-July 1985
The relationship between U-shaped peak-flux-density microwave spectra and solar proton events was re-examined for approx 200 large (Sp(> or = 2GHz) > or = 800 solar flux uits (sfu) microwave burst (1965 - 1979). The radio spectra fell into two basic classes: (a) U-shaped with two maxima ( > or = 800 sfu) in the range from 200 MHz to > or = 10 GHz (59% of all events), and (b) cutoff spectra with a maximum > or = 800 sfu at f > or = 2 GHz and Sp (200 MHz) < 100 sfu (18%). Nine percent of the events had intermediate spectra with a maximum > or = 800 sfu at f > or = 2 GHz and 100 sfu < or = Sp (200 MHz) < 800 sfu. The authors were unable to classify 15% of the events because of incomplete data. The associations of the three classes of spectra with Type II (and/or Type IV) meter-wavelenght bursts and > 10-MeV proton events of any size (> or = 0.01 pr per sq cm per sec per sr) are as follows: U-shaped Type II/IV (90% of large microwave bursts with U-shaped spectra are associated with Type II/IV events), protons (77%); intermediate Type II/IV (78%), protons (73%); and cutoff Type II/IV (22%), protons (33%). These statistics affirm various lines of evidence linking coronal shock waves and interplanetary proton events. They also suggest that the meter wavelength branch of the U-shaped spectrum may be attributable to second phase (vs flash phase) accelerated electrons.
- Research Organization:
- Air Force Geophysics Lab., Hanscom AFB, MA (USA)
- OSTI ID:
- 5728307
- Report Number(s):
- AD-A-164458/2/XAB; AFGL-TR-85-0180
- Country of Publication:
- United States
- Language:
- English
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Peak flux density spectra of large solar radio bursts and proton emission from flares
Peak-flux-density spectra of large radio bursts and proton emission from flares. Environmental research papers, July 1981-July 1985
Related Subjects
GENERAL PHYSICS
SOLAR FLARES
SOLAR PROTONS
SOLAR RADIO BURSTS
EMISSION
FLUX DENSITY
ACCELERATION
ELECTRONS
MEASURING INSTRUMENTS
SHOCK WAVES
SOLAR CORONA
SPECTRA
ATMOSPHERES
BARYONS
ELECTROMAGNETIC RADIATION
ELEMENTARY PARTICLES
FERMIONS
HADRONS
LEPTONS
NUCLEONS
PROTONS
RADIATIONS
RADIOWAVE RADIATION
SOLAR ACTIVITY
SOLAR PARTICLES
SOLAR RADIATION
STELLAR ATMOSPHERES
STELLAR CORONAE
STELLAR RADIATION
640104* - Astrophysics & Cosmology- Solar Phenomena