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((Short description|Swedish physicist))
'''Per Carlqvist''' (born July 25, 1938, in [[Stockholm]], [[Sweden]]) is a Swedish plasma physicist with an interest in astrophysical applications.<ref>Biographical information from: Carlqvist, Per; Gahm, Gosta F., "[http://adsabs.harvard.edu/cgi-bin/nph-bib_query?bibcode=1992ITPS...20..867C&amp;db_key=AST&amp;data_type=HTML&amp;format=&amp;high=42ca922c9c02593 Manifestations of electric currents in interstellar molecular cloud]" (1992) ''IEEE Transactions on Plasma Science'' (ISSN 0093-3813), vol. 20, no. 6, p. 867-873.</ref> In 1963, he received the degree of ''civilingenjör'' from the [[Royal Institute of Technology]], [[Stockholm]]; in 1970, the Tekn. lic.; and in 1980 the Tekn. D.

He is currently affiliated with the Royal Institute of Technology, Stockholm, at the School of Electrical Engineering in the department of Space & Plasma Physics.<ref>[https://archive.today/20120730010005/http://www.ee.kth.se/php/index.php?action=people&cmd=extended&peopleid=421 Web page] of Per Calqvist</ref>

He is the author of several papers on [[astrophysical plasmas]], from the formation of stars, [[Double layer (plasma)|double layers]], the [[Bennett Pinch]], to interstellar helical filaments. 

==The Carlqvist Relation==
Carlqvist lends his name to the "[[Bennett_Pinch#The Carlqvist relation|Carlqvist Relation]]",<ref>[[Gerrit_Verschuur|Gerrit L. Verschuur]], "[https://doi.org/10.1007%2FBF00678079 Interstellar neutral hydrogen filaments at high galactic latitudes and the bennett pinch]" (1995) Volume 227, Numbers 1-2 / May, 1995</ref> a formula used in plasma physics to describe how an electrically conducting plasma filament is compressed by magnetic forces to form a "[[Pinch (plasma physics)|plasma pinch]]". Carlqvist noted that by using his relation, and a derivative, it is possible to describe the Bennett pinch, the [[Jeans Instability|Jeans criterion]] (for gravitational instability,<ref>J. H. Jeans, "[http://adsabs.harvard.edu/abs/1902RSPTA.199....1J The stability of a spherical nebula]" ''Phil. Trans. R. Soc. Lond. A ''199 (1902)</ref> in one and two dimensions), [[Birkeland current|force-free magnetic fields]], gravitationally balanced magnetic pressures, and continuous transitions between these states.<ref>Carlqvist, Per, "[http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1988Ap&SS.144...73C Cosmic electric currents and the generalized Bennett relation]" (1988) ''Astrophysics and Space Science'' (ISSN 0004-640X), vol. 144, no. 1-2, May 1988, p. 73-84</ref>

==Notes==
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==External links==
*Articles on NASA Astrophysics Data System (ADS) by Per Carlqvist
:[http://adsabs.harvard.edu/cgi-bin/nph-abs_connect?db_key=AST&db_key=PHY&sim_query=YES&ned_query=YES&aut_logic=OR&obj_logic=OR&author=carlqvist%2C+p&object=&start_mon=&start_year=&end_mon=&end_year=&ttl_logic=OR&title=&txt_logic=OR&text=&nr_to_return=100&start_nr=1&jou_pick=ALL&ref_stems=&data_and=ALL&group_and=ALL&start_entry_day=&start_entry_mon=&start_entry_year=&end_entry_day=&end_entry_mon=&end_entry_year=&min_score=&sort=SCORE&data_type=SHORT&aut_syn=YES&ttl_syn=YES&txt_syn=YES&aut_wt=1.0&obj_wt=1.0&ttl_wt=0.3&txt_wt=3.0&aut_wgt=YES&obj_wgt=YES&ttl_wgt=YES&txt_wgt=YES&ttl_sco=YES&txt_sco=YES&version=1 All articles] | [http://adsabs.harvard.edu/cgi-bin/nph-abs_connect?db_key=AST&db_key=PHY&sim_query=YES&ned_query=YES&aut_logic=OR&obj_logic=OR&author=carlqvist%2C+p&object=&start_mon=&start_year=&end_mon=&end_year=&ttl_logic=OR&title=&txt_logic=OR&text=&nr_to_return=100&start_nr=1&jou_pick=ALL&ref_stems=&data_and=YES&abstract=YES&group_and=ALL&start_entry_day=&start_entry_mon=&start_entry_year=&end_entry_day=&end_entry_mon=&end_entry_year=&min_score=&sort=SCORE&data_type=SHORT&aut_syn=YES&ttl_syn=YES&txt_syn=YES&aut_wt=1.0&obj_wt=1.0&ttl_wt=0.3&txt_wt=3.0&aut_wgt=YES&obj_wgt=YES&ttl_wgt=YES&txt_wgt=YES&ttl_sco=YES&txt_sco=YES&version=1 With Abstracts] | [http://adsabs.harvard.edu/cgi-bin/nph-abs_connect?db_key=AST&db_key=PHY&sim_query=YES&ned_query=YES&aut_logic=OR&obj_logic=OR&author=carlqvist%2C+p&object=&start_mon=&start_year=&end_mon=&end_year=&ttl_logic=OR&title=&txt_logic=OR&text=&nr_to_return=100&start_nr=1&jou_pick=ALL&ref_stems=&data_and=YES&gif_link=YES&group_and=ALL&start_entry_day=&start_entry_mon=&start_entry_year=&end_entry_day=&end_entry_mon=&end_entry_year=&min_score=&sort=SCORE&data_type=SHORT&aut_syn=YES&ttl_syn=YES&txt_syn=YES&aut_wt=1.0&obj_wt=1.0&ttl_wt=0.3&txt_wt=3.0&aut_wgt=YES&obj_wgt=YES&ttl_wgt=YES&txt_wgt=YES&ttl_sco=YES&txt_sco=YES&version=1 With Full text]

((Authority control))
((DEFAULTSORT:Carlqvist, Per))
[[Category:1938 births]]
[[Category:Swedish physicists]]
[[Category:Academic staff of the KTH Royal Institute of Technology]]
[[Category:Living people]]

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