Proposal for a Real 3D Solar Spectrum Telescope

The concept of a new type of the solar optical telescope is proposed that can record simultaneously the two dimensional dispersions(3D spectrum) of observed regions on the solar disk,i.e.a series of synchronous narrow-bandpass spectral images.It can allow us to do detailed spectral analysis while being able to own a super high temporal resolution,say,tens of milliseconds.Such a telescope can be formed with an array of sub-telescopes in each of which an image of the observed area is recorded at the different designed bandpass within one interested line,and the collection of these bandpasses spreads and covers the whole spectral band of an interesting spectral line.It can be suitable to diagnose the three-component velocity fields of mass flows,and obtain the ability to reconstruct three dimensional(3D) structure of solar active region(say,solar flaring region) in the opaque lower atmosphere.And further,with the polarimeter mounted to each of its sub-telescope,the accurate measurement of the vector magnetic field can be realized,and it can be regarded as the second generation video magnetograph.One such telescope consists of many compact subtelescopes.Two kinds of configurations of compact arrays mounting the sub-telescopes are outlined respectively.A sample optical scheme realizing the narrow band-pass(up to 30m Å) observation for each sub-telescope is described and the crucial technology keeping the cadence of simultaneous imaging is presented in the text.Generally,the aperture and number of the sub-telescopes depend on the property of measurement.For instance,the flare observation needs more sub-telescopes with smaller aperture than that of the vector magnetic field measurement.The advantage of constructing such a telescope lies in that each sub-telescope can be constructed as an etalon.Finally comparison with ATST(Advanced Technology Solar Telescope) is stated.