Imaging the variable Sun
O. Wucknitz
- Argelander-Institut für Astronomie, Auf dem Hügel 71, 53121 Bonn, Germany
Abstract
I discuss the first Solar imaging attempts with LOFAR. Using similar methods as for long-baseline data, I was able to produce the first resolved LOFAR images of the Sun. The main challenge in imaging the Sun is its variability in time and frequency, which makes consistent imaging and calibration difficult. After trying different ad hoc methods, I apply a variant of my difference-imaging method. Preliminary results look promising and are able to separate the constant emission from variable parts.
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PDF file (2.4 MB, last change 18 Dec 2010)
24 pages (many of those are additional material), suitable for presentation with acroread. This version also includes some hyperlinks for quick navigation and links to references.
download printable version (small)
PDF file (1004.3 kB, last change 18 Dec 2010)
Paper saving version. 3 pages, text in b/w, colour figures. 8 slides per A4 page.
download movie 1: incoherent multi-band delay/rate 3C196 Unterweilenbach-Tautenburg
MPEG4 movie (8.2 MB, last change 16 Feb 2010)
download movie 2: the Sun with 10 sec integration time per step, real duration ca. 10
min, about 10:16:30 - 10:26:20 on 9-Jun-2010, plays 100 times
faster than real-time
MPEG4 movie (176.3 kB, last change 8 Jul 2010)
download movie 3: the Sun with 1 sec integration time per step, real duration 30
sec, about 10:17:10 - 10:17:40 on 9-Jun-2010, plays in real-time
MPEG4 movie (129.9 kB, last change 8 Jul 2010)
download movie 4: the Sun at 6 frequencies with 10 sec integration time per step, real duration ca. 10 min, about 10:16:55 - 10:26:45 on 9-Jun-2010, plays 10 times faster than real-time
MPEG4 movie (1.7 MB, last change 13 Dec 2010)
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Script last modified on 7 Sep 2010
Last change to this data base entry on 12 May 2011