Search: onr:"swepub:oai:DiVA.org:su-192590" >
Measurements of the...
Measurements of the time-dependent cosmic-ray Sun shadow with seven years of IceCube data : Comparison with the Solar cycle and magnetic field models
-
- Ahrens, Maryon (author)
- Stockholms universitet,Fysikum,Oskar Klein-centrum för kosmopartikelfysik (OKC)
-
- Bohm, Christian (author)
- Stockholms universitet,Fysikum,Oskar Klein-centrum för kosmopartikelfysik (OKC)
-
- Deoskar, Kunal (author)
- Stockholms universitet,Fysikum,Oskar Klein-centrum för kosmopartikelfysik (OKC)
-
show more...
-
- Finley, Chad (author)
- Stockholms universitet,Fysikum,Oskar Klein-centrum för kosmopartikelfysik (OKC)
-
- Hultqvist, Klas (author)
- Stockholms universitet,Fysikum,Oskar Klein-centrum för kosmopartikelfysik (OKC)
-
- Jansson, Matti (author)
- Stockholms universitet,Fysikum,Oskar Klein-centrum för kosmopartikelfysik (OKC)
-
- Walck, Christian (author)
- Stockholms universitet,Fysikum,Oskar Klein-centrum för kosmopartikelfysik (OKC)
-
- Aartsen, M. G. (author)
- Univ Canterbury, Dept Phys & Astron, Private Bag 4800, Christchurch, New Zealand
-
- Botner, Olga (author)
- Uppsala universitet,Högenergifysik
-
- Burgman, Alexander (author)
- Uppsala universitet,Högenergifysik
-
- Hallgren, Allan, 1951- (author)
- Uppsala universitet,Högenergifysik
-
- O'Sullivan, Erin (author)
- Uppsala universitet,Högenergifysik
-
- Pérez de los Heros, Carlos (author)
- Uppsala universitet,Högenergifysik
-
- Unger, E. (author)
- Uppsala Univ, Dept Phys & Astron, Box 516, S-75120 Uppsala, Sweden
-
- Zoecklein, M. (author)
- Rhein Westfal TH Aachen, Phys Inst 3, D-52056 Aachen, Germany
-
show less...
-
(creator_code:org_t)
- American Physical Society, 2021
- 2021
- English.
-
In: Physical Review D. - : American Physical Society. - 2470-0010 .- 2470-0029. ; 103:4
- Related links:
-
https://arxiv.org/ab...
-
show more...
-
https://urn.kb.se/re...
-
https://doi.org/10.1...
-
https://urn.kb.se/re...
-
show less...
Abstract
Subject headings
Close
- Observations of the time-dependent cosmic-ray Sun shadow have been proven as a valuable diagnostic for the assessment of solar magnetic field models. In this paper, seven years of IceCube data are compared to solar activity and solar magnetic field models. A quantitative comparison of solar magnetic field models with IceCube data on the event rate level is performed for the first time. Additionally, a first energy-dependent analysis is presented and compared to recent predictions. We use seven years of IceCube data for the moon and the Sun and compare them to simulations on data rate level. The simulations are performed for the geometrical shadow hypothesis for the moon and the Sun and for a cosmic-ray propagation model governed by the solar magnetic field for the case of the Sun. We find that a linearly decreasing relationship between Sun shadow strength and solar activity is preferred over a constant relationship at the 6.4 sigma level. We test two commonly used models of the coronal magnetic field, both combined with a Parker spiral, by modeling cosmic-ray propagation in the solar magnetic field. Both models predict a weakening of the shadow in times of high solar activity as it is also visible in the data. We find tensions with the data on the order of 3 sigma for both models, assuming only statistical uncertainties. The magnetic field model CSSS fits the data slightly better than the PFSS model. This is generally consistent with what is found previously by the Tibet AS-gamma Experiment; a deviation of the data from the two models is, however, not significant at this point. Regarding the energy dependence of the Sun shadow, we find indications that the shadowing effect increases with energy during times of high solar activity, in agreement with theoretical predictions.
Subject headings
- NATURVETENSKAP -- Fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences (hsv//eng)
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Keyword
- Cosmic ray propagation
- Magnetic field generation & plasma dynamo
- Space & astrophysical plasma
- Wave-wave wave-particle interactions
Publication and Content Type
- ref (subject category)
- art (subject category)
Find in a library
To the university's database
- By the author/editor
-
Ahrens, Maryon
-
Bohm, Christian
-
Deoskar, Kunal
-
Finley, Chad
-
Hultqvist, Klas
-
Jansson, Matti
-
show more...
-
Walck, Christian
-
Aartsen, M. G.
-
Botner, Olga
-
Burgman, Alexand ...
-
Hallgren, Allan, ...
-
O'Sullivan, Erin
-
Pérez de los Her ...
-
Unger, E.
-
Zoecklein, M.
-
show less...
- About the subject
-
- NATURAL SCIENCES
-
NATURAL SCIENCES
-
and Physical Science ...
-
- NATURAL SCIENCES
-
NATURAL SCIENCES
-
and Physical Science ...
-
and Astronomy Astrop ...
- Articles in the publication
-
Physical Review ...
- By the university
-
Stockholm University
-
Uppsala University