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Low-temperature plasma ejected in solar eruptions can screen active regionsas well as quiet solar areas. Absorption phenomena can be observed inmicrowaves as 'negative bursts' and in different spectral domains. We analyzetwo very different recent events with such phenomena and present an updatedsystematic view of solar events associated with negative bursts. Relatedfilament eruptions can be normal, without essential changes of shape andmagnetic configuration, and 'anomalous'. The latter are characterized bydisintegration of an eruptive filament and dispersal of its remnants as a cloudover a large part of solar disk. Such phenomena can be observed as giantdepressions in the He II 304 A line. One of possible scenarios for an anomalouseruption is proposed in terms of reconnection of filament's internal magneticfields with external large-scale coronal surrounding.

Microwave Negative Bursts as Indications of Reconnection between Eruptive Filaments and Large-Scale Coronal Magnetic Environment