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Wavelet-based Characterization of Small-scale Solar Emission Features at Low Radio Frequencies

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dc.contributor Haystack Observatory
dc.contributor Massachusetts Institute of Technology. Department of Physics
dc.contributor MIT Kavli Institute for Astrophysics and Space Research
dc.contributor Pankratius, Victor
dc.contributor Lonsdale, Colin John
dc.contributor Cappallo, Roger J
dc.contributor Corey, Brian E
dc.contributor Kratzenberg, Eric W
dc.contributor McWhirter, Stephen R.
dc.contributor Morgan, Edward H
dc.contributor Williams, Christopher Leigh
dc.creator Suresh, A.
dc.creator Sharma, R.
dc.creator Oberoi, D.
dc.creator Das, S. B.
dc.creator Timar, B.
dc.creator Bowman, J. D.
dc.creator Briggs, F.
dc.creator Deshpande, A. A.
dc.creator Emrich, D.
dc.creator Goeke, R.
dc.creator Greenhill, L. J.
dc.creator Hazelton, B. J.
dc.creator Johnston-Hollitt, M.
dc.creator Kaplan, D. L.
dc.creator Kasper, J. C.
dc.creator Lynch, M. J.
dc.creator Mitchell, D. A.
dc.creator Morales, M. F.
dc.creator Ord, S. M.
dc.creator Prabu, T.
dc.creator Rogers, A. E. E.
dc.creator Roshi, A.
dc.creator Shankar, N. Udaya
dc.creator Srivani, K. S.
dc.creator Subrahmanyan, R.
dc.creator Tingay, S. J.
dc.creator Waterson, M.
dc.creator Wayth, R. B.
dc.creator Webster, R. L.
dc.creator Whitney, A. R.
dc.creator Williams, A.
dc.creator Pankratius, Victor
dc.creator Lonsdale, Colin John
dc.creator Cappallo, Roger J
dc.creator Corey, Brian E
dc.creator Kratzenberg, Eric W
dc.creator McWhirter, Stephen R.
dc.creator Morgan, Edward H
dc.creator Williams, Christopher Leigh
dc.date 2017-11-08T21:21:24Z
dc.date 2017-11-08T21:21:24Z
dc.date 2017-06
dc.date 2017-05
dc.date 2017-11-08T13:58:53Z
dc.date.accessioned 2023-03-01T18:09:34Z
dc.date.available 2023-03-01T18:09:34Z
dc.identifier 1538-4357
dc.identifier 0004-637X
dc.identifier http://hdl.handle.net/1721.1/112151
dc.identifier Suresh, A. et al. “Wavelet-Based Characterization of Small-Scale Solar Emission Features at Low Radio Frequencies.” The Astrophysical Journal 843, 1 (June 2017): 19 © 2017 The American Astronomical Society
dc.identifier https://orcid.org/0000-0002-4658-6583
dc.identifier https://orcid.org/0000-0001-7809-7357
dc.identifier https://orcid.org/0000-0001-7130-208X
dc.identifier.uri http://localhost:8080/xmlui/handle/CUHPOERS/278973
dc.description Low radio frequency solar observations using the Murchison Widefield Array have recently revealed the presence of numerous weak short-lived narrowband emission features, even during moderately quiet solar conditions. These nonthermal features occur at rates of many thousands per hour in the 30.72 MHz observing bandwidth, and hence necessarily require an automated approach for their detection and characterization. Here, we employ continuous wavelet transform using a mother Ricker wavelet for feature detection from the dynamic spectrum. We establish the efficacy of this approach and present the first statistically robust characterization of the properties of these features. In particular, we examine distributions of their peak flux densities, spectral spans, temporal spans, and peak frequencies. We can reliably detect features weaker than 1 SFU, making them, to the best of our knowledge, the weakest bursts reported in literature. The distribution of their peak flux densities follows a power law with an index of -2.23 in the 12-155 SFU range, implying that they can provide an energetically significant contribution to coronal and chromospheric heating. These features typically last for 1-2 s and possess bandwidths of about 4-5 MHz. Their occurrence rate remains fairly flat in the 140-210 MHz frequency range. At the time resolution of the data, they appear as stationary bursts, exhibiting no perceptible frequency drift. These features also appear to ride on a broadband background continuum, hinting at the likelihood of them being weak type-I bursts.
dc.format application/pdf
dc.relation http://dx.doi.org/10.3847/1538-4357/aa774a
dc.relation Astrophysical Journal
dc.rights Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
dc.source IOP Publishing
dc.title Wavelet-based Characterization of Small-scale Solar Emission Features at Low Radio Frequencies
dc.type Article
dc.type http://purl.org/eprint/type/JournalArticle


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