Other
Scientific paper
May 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999r%26qe...42..357a&link_type=abstract
Radiophys. Quantum Electron., Vol. 42, No. 5, p. 357 - 369
Other
Solar Radio Bursts: Solar Limb, Solar Radio Bursts: Structure
Scientific paper
The intensity-time profiles I(t) of narrow-band radio bursts, which form the slanted dynamical spectrum (If,t) of type IIId emission are strongly dependent on the heliolongitudes |l| of their coronal (quasi-monochromatic) sources. In the central sector each of these short-time, steep-front bursts generated at the second harmonic has a delayed echo-like component, and they usually have a slow exponential decay at the limb. Using the UTR-2 antenna in the range 30 > f > 15 MHz, the authors have previously discovered another, previously unknown limb form of discontinuous type IIId spectrum. It is only the absence of the echo component that makes this spectrum different from the bimodal spectrum. It appears that fast-decaying limb bursts of short duration ≡1 s can be observed at considerable distances on the left and on the right of the solar disk. These bursts are similar in form to the leading pulses of the central binary bursts. The apparent sources of unusually short-time limb bursts are nonstationary and do not tend to shift from the periphery to the central region of the corona. In the vicinity of the Sun, these sources can move over the celestial sphere at superluminal velocities along transversal global-scale trajectories. The behavior of the related dynamical source that is observed for several seconds indicates the existence of fairly dense coronal structures breaking the spherical symmetry of the solar atmosphere. These structures are successively illuminated during the burst and effectively alter the paths of some rays of the wave packet that were initially not directed to the Earth.
Abranin Edward P.
Bazelyan L. L.
Tsybko Ya. G.
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