astronomy

Merav Opher

Merav Opher is a astronomy topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Merav Opher rather than just read about it. In short: Merav Opher is a professor of astronomy at Boston University known for her work on the heliosphere, the cocoon formed by the wind emanated from the Sun as it travels in the Galaxy. In 2021 she was named a William Bentinck-Smith Fellow at the Harvard Radcliffe Institute.

Key takeaways

Merav Opher belongs to astronomy; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Merav Opher to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Merav Opher from memory before moving on to harder problems.

Reference excerpt

Merav Opher is a professor of astronomy at Boston University known for her work on the heliosphere, the cocoon formed by the wind emanated from the Sun as it travels in the Galaxy. In 2021 she was named a William Bentinck-Smith Fellow at the Harvard Radcliffe Institute.

Education and career Opher was born in Israel and lived there until 1978 when she moved to Brazil with her parents. In 1992 and 1998, Opher received her B.S. in physics and her Ph.D. in physics and astronomy from the University of São Paulo. Following her Ph.D., Opher was a postdoctoral investigator at the University of California, Los Angeles from 1999 until 2001. She was a Caltech Scholar at NASA's Jet Propulsion Laboratory and at University of Michigan from 2001-2004. She was on the faculty of George Mason University from 2005 until 2010, at which point she moved to Boston University, where she was promoted to professor in 2020. Opher is the director of the SHIELD DRIVE Science Center at Boston University, a project funded by NASA that will study the shape of the heliosphere. She has served on the Space Studies Board at the National Academy of Sciences which evaluated the progress of space and solar physics.

Research Her research interests include computational and theoretical plasma physics in space and astrophysics, interaction of the Solar System with the interstellar medium, solar wind, and shocks in the lower corona, T-Tauri and Solar-Like Stars. In 2001, Opher began work on the heliosphere while she was a postdoctoral student at the Jet Propulsion lab. Her researcher focuses on how the solar wind shapes the heliosphere, the protective atmospheric shield between Earth and the rest of the galaxy, where she has shown the shape of the heliosphere is similar to a croissant and not a comet with a tail as previously thought. Opher's 2020 paper expanding on the crescent shape of the heliosphere was published in Nature Astronomy, featured on the cover of the July 2020 issue, and covered by the media. In 2021, Opher's research revealed that the stability of the heliosphere originates from the neutral hydrogen particles that interact with the heliosphere. Opher has written in The Hill about the dangers of space tourism for people where she describes the radiation coming through space and the need to better understand how the heliosphere filters this radiation before people can travel safely to other planets. As of 2021, Opher's research has been cited more than 4400 times and she has an h-index of 37.

Honors and awards In 2008, Opher received an NSF Young Investigator Award, a Presidential Early Career Award for Scientists and Engineers, and she was named a Kavli Fellow by the National Academy of Sciences. In 2021, Opher was named a William Bentinck-Smith Fellow at the Harvard Radcliffe Institute.

Selected publications Opher, M.; Bibi, F. Alouani; Toth, G.; Richardson, J. D.; Izmodenov, V. V.; Gombosi, T. I. (2009). "A strong, highly-tilted interstellar magnetic field near the Solar System". Nature. 462 (7276): 1036–1038. Bibcode:2009Natur.462.1036O. doi:10.1038/nature08567. ISSN 0028-0836. PMID 20033043. S2CID 205218936. Opher, Merav; Stone, Edward C.; Liewer, Paulett C. (2006-03-20). "The Effects of a Local Interstellar Magnetic Field on Voyager 1 and 2 Observations". The Astrophysical Journal. 640 (1): L71–L74. arXiv:astro-ph/0603318. Bibcode:2006ApJ...640L..71O. doi:10.1086/503251. ISSN 0004-637X. S2CID 16029184. Opher, Merav; Silva, Luis O.; Dauger, Dean E.; Decyk, Viktor K.; Dawson, John M. (2001-05-01). "Nuclear reaction rates and energy in stellar plasmas: The effect of highly damped modes". Physics of Plasmas. 8 (5): 2454–2460. arXiv:astro-ph/0105153. Bibcode:2001PhPl....8.2454O. doi:10.1063/1.1362533. ISSN 1070-664X. S2CID 18625282. Tóth, Gábor; van der Holst, Bart; Sokolov, Igor V.; De Zeeuw, Darren L.; Gombosi, Tamas I.; Fang, Fang; Manchester, Ward B.; Meng, Xing; Najib, Dalal; Powell, Kenneth G.; Stout, Quentin F. (2012-02-01). "Adaptive numerical algorithms in space weather modeling". Journal of Computational Physics. Special Issue: Computational Plasma Physics. 231 (3): 870–903. Bibcode:2012JCoPh.231..870T. doi:10.1016/j.jcp.2011.02.006. hdl:2060/20110005631. ISSN 0021-9991.

References

External links William Bentinck-Smith Fellowship Page Where I'm Coming From: Merav Opher on YouTube, April 20, 2018 video featuring Opher

Worked examples

Example 1 — a first encounter with Merav Opher

Start with the simplest possible case. Write down what Merav Opher claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In astronomy, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Merav Opher before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Merav Opher ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Merav Opher

In research: Merav Opher appears in astronomy research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Merav Opher in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Merav Opher is common in secondary-school and first-year university syllabi. It links to neighbouring topics 21st-century American physicists, 21st-century American women physicists, Boston University faculty, so understanding it makes those chapters shorter.
In everyday life: Look for Merav Opher outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Merav Opher in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Merav Opher means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Merav Opher out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Merav Opher in simple terms?

Why does Merav Opher matter?

Because it connects several astronomy ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Merav Opher?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Merav Opher.