Abstract Very Large Array (V.L.A.) measurements at 20 cm wavelength map emission from coronal loops with second-of-arc angular resolution at time intervals as short as 3.3 seconds. The total intensity of the 20 cm emission describes the evolution and structure of the hot plasma that is detected by satellite X-ray observations of coronal loops. The circular polarization of the 20 cm emission describes the evolution, strength and structure of the coronal magnetic field. Preburst heating and magnetic changes that precede burst emission on time scales of between 1 and 30 minutes are discussed. Simultaneous 20 cm and soft X-ray observations indicate an electron temperature T e ▪ 2.5 × 107 K and electron density N e ▪ 1010 cm−3 during preburst heating in a coronal loop that was also associated with twisting of the entire loop in space. We also discuss the successive triggering of bursts from adjacent coronal loops; highly polarized emission from the legs of loops with large intensity changes over a 32 MHz change in observing frequency; and apparent motions of hot plasma within coronal loops at velocities V > 2,000 kilometers per second.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    V.L.A. observations of flare build-up in coronal loops


    Contributors:

    Published in:

    Publication date :

    1984-01-01


    Size :

    6 pages




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English



    VELOCITY FLUCTUATIONS IN CORONAL LOOPS AS FLARE DRIVERS

    Nigro, G. / Malara, F. / Veltri, P. et al. | British Library Conference Proceedings | 2005


    Post-Flare Loops Embedded in a Hot Coronal Fan-Like Structure

    Svestka, Z. et al. | British Library Online Contents | 1997


    Very Large Array (VLA) Observations of Coronal Loops

    Lang, K. R. | British Library Online Contents | 1992


    Diagnostics of Coronal Loops from Multi-Band Observations

    Reale, F. / Ciaravella, A. / European Space Agency | British Library Conference Proceedings | 2006