Peak-flux-density spectra of large solar radio bursts and proton emission from flares

Details Peak-flux-density spectra of large solar radio bursts and proton emission from flares Peak-flux-density spectra of large solar radio bursts and proton emission from flares

Aug 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985aifo.reptq....c&link_type=abstract

Scientific Interim Report, Jul. 1981 - Jul. 1985 Air Force Geophysics Lab., Hanscom AFB, MA. Space Physics Div.

Astronomy and Astrophysics

Astronomy

Electrons, Microwave Spectra, Particle Acceleration, Protons, Solar Corona, Solar Flares, Solar Radio Bursts, Flux Density, Frequencies, Microwave Emission, Radio Sources (Astronomy), Radio Spectroscopy, Shock Waves

Scientific paper

We have reexamined the relationship between U-shaped peak-flux-density microwave spectra and solar proton events for approx 200 large (Sp(> or = 2GHz) > or = 800 solar flux units (sfu) microwave burst (1965 - 1979). The radio spectra fell into two basic classes: (1) U-shaped with two maxima ( > or = 800 sfu) in the range from 200 MHz to > or = 10 GHz (59 percent of all events), and (2) cutoff spectra with a maximum > or = 800 sfu at f > or = 2 GHz and Sp (200 MHz) < 100 sfu (18 percent). 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. We were unable to classify 15 percent 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 percent of large microwave bursts with U-shaped spectra are associated with Type II/IV events), protons (77 percent); intermediate Type II/IV (78 percent), protons (73 percent); and cutoff Type II/IV (22 percent), protons (33 percent). 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.

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