YOHKOH observation of the source regions of solar narrowband, millisecond spike events.

Details YOHKOH observation of the source regions of solar narrowband, millisecond spike events. YOHKOH observation of the source regions of solar narrowband, millisecond spike events.

Jan 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997a%26a...317..569k&link_type=abstract

Astronomy and Astrophysics, v.317, p.569-579

Astronomy and Astrophysics

Astrophysics

16

Sun: Flares, Sun: Particle Emission, Sun: Radio Radiation, Interplanetary Medium, Sun: X-Rays

Scientific paper

The source regions of metric spike events are investigated on Yohkoh soft X-ray (SXR) maps. The spikes are identified by the spectrometer Phoenix between 300MHz and 360MHz and are associated with groups of type III bursts at lower frequencies reaching also the decametric range. The Very Large Array (VLA) provides simultaneously spatial information at 333MHz, 1446MHz and 4866MHz. Similar to the previous VLA observation of a metric spike event, the new data are consistent with a high altitude of the spike sources of about 5x10^10^cm above the photosphere. The additionally available SXR data for one of the presented events give the following new informations: (i) The spike sources occur near open field lines and near regions of a slightly enhanced SXR flux relative to the ambient plasma. (ii) Contrary to SXR observations of type III bursts without metric spike activity, no SXR jet is observed. (iii) At low altitude, a weak SXR enhancement occurs, peaking about 60 s after the spike event. The SXR source and the spike sources can be connected by potential field lines. The observations corroborate a model in which a metric spike event is attributed to an energy release region at high altitude, while upwards propagating electrons produce type III bursts and downward moving electrons are responsible for SXR emission of heated plasma.

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