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Title: The existence and nature of the interstellar bow shock

Abstract

We report a new diagnosis of two different states of the local interstellar medium (LISM) near our solar system by using a sensitivity study constrained by several distinct and complementary observations of the LISM, solar wind, and inner heliosphere. Assuming the Interstellar Boundary Explorer (IBEX) He flow parameters for the LISM, we obtain a strength of ∼2.7 ± 0.2 μG and a direction pointing away from galactic coordinates (28, 52) ± 3° for the interstellar magnetic field as a result of fitting Voyager 1 and Voyager 2 in situ plasma measurements and IBEX energetic neutral atoms ribbon. When using Ulysses parameters for the LISM He flow, we recently reported the same direction but with a strength of 2.2 ± 0.1 μG. First, we notice that with Ulysses He flow, our solution is in the expected hydrogen deflection plane (HDP). In contrast, for the IBEX He flow, the solution is ∼20° away from the corresponding HDP plane. Second, the long-term monitoring of the interplanetary H I flow speed shows a value of ∼26 km s{sup –1} measured upwind from the Doppler shift in the strong Lyα sky background emission line. All elements of the diagnosis seem therefore to support Ulysses Hemore » flow parameters for the interstellar state. In that frame, we argue that reliable discrimination between superfast, subfast, or superslow states of the interstellar flow should be based on most existing in situ and remote observations used together with global modeling of the heliosphere. For commonly accepted LISM ionization rates, we show that a fast interstellar bow shock should be standing off upstream of the heliopause.« less

Authors:
 [1]; ;
  1. UPMC Univ Paris 06, UMR7095, Institut d'Astrophysique de Paris, F-75014, Paris (France)
Publication Date:
OSTI Identifier:
22348407
Resource Type:
Journal Article
Journal Name:
Astrophysical Journal
Additional Journal Information:
Journal Volume: 779; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0004-637X
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; DOPPLER EFFECT; EMISSION; HELIOSPHERE; INTERSTELLAR MAGNETIC FIELDS; PLASMA; SENSITIVITY ANALYSIS; SHOCK WAVES; SKY; SOLAR SYSTEM; SOLAR WIND; SUN; VELOCITY; VOYAGER SPACE PROBES

Citation Formats

Ben-Jaffel, Lotfi, Strumik, M., Ratkiewicz, R., and Grygorczuk, J., E-mail: bjaffel@iap.fr. The existence and nature of the interstellar bow shock. United States: N. p., 2013. Web. doi:10.1088/0004-637X/779/2/130.
Ben-Jaffel, Lotfi, Strumik, M., Ratkiewicz, R., & Grygorczuk, J., E-mail: bjaffel@iap.fr. The existence and nature of the interstellar bow shock. United States. doi:10.1088/0004-637X/779/2/130.
Ben-Jaffel, Lotfi, Strumik, M., Ratkiewicz, R., and Grygorczuk, J., E-mail: bjaffel@iap.fr. Fri . "The existence and nature of the interstellar bow shock". United States. doi:10.1088/0004-637X/779/2/130.
@article{osti_22348407,
title = {The existence and nature of the interstellar bow shock},
author = {Ben-Jaffel, Lotfi and Strumik, M. and Ratkiewicz, R. and Grygorczuk, J., E-mail: bjaffel@iap.fr},
abstractNote = {We report a new diagnosis of two different states of the local interstellar medium (LISM) near our solar system by using a sensitivity study constrained by several distinct and complementary observations of the LISM, solar wind, and inner heliosphere. Assuming the Interstellar Boundary Explorer (IBEX) He flow parameters for the LISM, we obtain a strength of ∼2.7 ± 0.2 μG and a direction pointing away from galactic coordinates (28, 52) ± 3° for the interstellar magnetic field as a result of fitting Voyager 1 and Voyager 2 in situ plasma measurements and IBEX energetic neutral atoms ribbon. When using Ulysses parameters for the LISM He flow, we recently reported the same direction but with a strength of 2.2 ± 0.1 μG. First, we notice that with Ulysses He flow, our solution is in the expected hydrogen deflection plane (HDP). In contrast, for the IBEX He flow, the solution is ∼20° away from the corresponding HDP plane. Second, the long-term monitoring of the interplanetary H I flow speed shows a value of ∼26 km s{sup –1} measured upwind from the Doppler shift in the strong Lyα sky background emission line. All elements of the diagnosis seem therefore to support Ulysses He flow parameters for the interstellar state. In that frame, we argue that reliable discrimination between superfast, subfast, or superslow states of the interstellar flow should be based on most existing in situ and remote observations used together with global modeling of the heliosphere. For commonly accepted LISM ionization rates, we show that a fast interstellar bow shock should be standing off upstream of the heliopause.},
doi = {10.1088/0004-637X/779/2/130},
journal = {Astrophysical Journal},
issn = {0004-637X},
number = 2,
volume = 779,
place = {United States},
year = {2013},
month = {12}
}