First VLA observation of a solar narrowband, millisecond spike event.

Details First VLA observation of a solar narrowband, millisecond spike event. First VLA observation of a solar narrowband, millisecond spike event.

Oct 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995a%26a...302..551k&link_type=abstract

Astronomy and Astrophysics, v.302, p.551

Astronomy and Astrophysics

Astrophysics

27

Sun: Flares, Sun: Radio Radiation, Millisecond Spikes

Scientific paper

The first spatially resolved observation of solar, narrowband spikes in two dimensions is presented. The 'metric' spikes around 333MHz are classified by the broadband spectrometer Phoenix (ETH Zuerich), whereas the simultaneously observing Very Large Array (VLA) provides high angular resolution images of the solar disc. At lower frequencies, a group of associated type III bursts is detected. The spikes occur at high altitude (=~4.5x10^10^cm above the photosphere), and at least 3 separated locations of emission can be identified. The different spike sources are separated by up to 130" and show different degrees of polarization. Spikes and type III bursts have the same sense of circular polarization, and according to the extrapolated potential field lines, the polarization of the different spike sources is in x-mode. With a delay of 42s, a thermal source appears on the same extrapolated potential field lines as the spikes at the second frequency of the VLA (1446MHz). The location of the energy release relative to the spikes source is discussed. A scenario is proposed where the energy is released in or near the spike source, and in which the spikes, the type III bursts and the thermal source originate from the same energy release. Hot electrons expanding along the field lines generate a type III burst (upward direction) and heat the underlying dense plasma (thermal source).

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