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Princess Sirindhorn Neutron Monitor project

Introduction in English

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             à¹×èͧ´éǾÃÐÁËÒ¡ÃسҸԤس¢Í§ÊÁà´ç¨¾ÃÐà·¾Ãѵ¹ÃÒªÊØ´ÒÏ ÊÂÒÁºÃÁÃÒª¡ØÁÒÃÕ ä´éâ»Ã´à¡ÅéÒÏ ¾ÃÐÃÒª·Ò¹¾ÃÐÃҪҹحҵãËéʶҹյÃǨÇÑ´¹ÔǵÃ͹áË觹ÕéÁÕ¹ÒÁÇèÒ Ê¶Ò¹ÕµÃǨÇÑ´¹ÔǵÃ͹ÊÔÃÔ¹¸Ã (Princess Sirindhorn Neutron Monitor)”

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à¤Ã×èͧµÃǨÇÑ´¹ÔǵÃ͹ä´éÁÕ¡ÒþѲ¹Ò¢Öé¹à»ç¹¤ÃÑé§áÃ¡ã¹»Õ ¾.È. òôùñ â´Â ਠàÍ «ÔÁ»ìÊѹ  (J. A. Simpson)  áËè§ÁËÒÇÔ·ÂÒÅѪԤÒâ¡  »ÃÐà·ÈÊËÃÑ°ÍàÁÃÔ¡Ò    à¾×èÍÈÖ¡ÉÒà¡ÕèÂǡѺÃѧÊÕ¤ÍÊÁÔ¡·ÕèÁÕ¾Åѧ§Ò¹ÊÙ§ (ÃдѺ GeV) ¡ÅèÒǤ×Í Í¹ØÀÒ¤¾Åѧ§Ò¹ÊÙ§·ÕèÁÒ¨Ò¡ÍÇ¡ÒÈ («Öè§ÁÒâ´Â¸ÃÃÁªÒµÔ)  à¤Ã×èͧµÃǨÇÑ´¹ÔǵÃ͹ÁÕàʶÕÂÃÀÒ¾ÊÙ§áÅÐÁÕ¡ÒõÑ駷ÕèµÓá˹觵èÒ§æ º¹¾×é¹âÅ¡ â´ÂÍÒÈÑ»ÃÐ⪹ì¨Ò¡Ê¹ÒÁáÁèàËÅç¡âš㹡ÒäѴàÅ×͡͹ØÀÒ¤·ÕèÁÕÃдѺ¾Åѧ§Ò¹µèÒ§æ ¡Ñ¹  ¶éÒÁÕ¡ÒúÓÃاÃÑ¡ÉÒà¾Õ§àÅ硹éÍ à¤Ã×èͧÇѴẺ¹ÕéÊÒÁÒöãËé¢éÍÁÙÅ·ÕèÁդس¤èÒÊ٧㹷ҧÇÔ·ÂÒÈÒʵÃìä´éà»ç¹àÇÅÒà¡Ô¹Ë¹Ö觷ÈÇÃÃÉ ËÃ×ÍáÁé¡ÃзÑ觶֧ËéÒ·ÈÇÃÃÉàÅ·Õà´ÕÂÇ àªè¹ ʶҹշÕèä¤ÅáÁ¡«ì â¤âÅÃÒâ´ »ÃÐà·ÈÊËÃÑ°ÍàÁÃÔ¡Ò

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¤ÇÒÁÊÙ§¢Í§µÓá˹觷Õè¨ÐµÔ´µÑé§Ê¶Ò¹ÕµÃǨÇÑ´¹ÔǵÃ͹¹ÕéÁÕ¤ÇÒÁÊӤѭÁÒ¡ à¹×èͧ¨Ò¡Í¹ØÀÒ¤¹ÔǵÃ͹¨ÐÁըӹǹŴŧẺàÍ¡«ìâ»à¹¹àªÕÂÅ àÁ×èͤÇÒÁ´Ñ¹ÍÒ¡ÒÈÁÕ¤èÒà¾ÔèÁ¢Öé¹ ·Ø¡¤ÃÑ駷Õè¤ÇÒÁÊ٧Ŵŧ ñðð àÁµÃ ¨Ó¹Ç¹¹ÔǵÃ͹·ÕèÇÑ´ä´é¨ÐŴŧ ø à»ÍÃìà«ç¹µì ËÃ×ͶéÒà·Õº¡ÑºÂÍ´´ÍÂÍÔ¹·¹¹·ì (ò,õöõ àÁµÃ) àÁ×èͤÇÒÁÊ٧Ŵŧ¶Ö§ÃдѺ ò,ððð àÁµÃ ¨ÐÊÙ­àÊÕ¢éÍÁÙŶ֧ ôð à»ÍÃìà«ç¹µì ´Ñ§¹Ñ鹺ÃÔàdzÂÍ´´ÍÂÍÔ¹·¹¹·ì¨Ö§à»ç¹ºÃÔàdz·ÕèàËÁÒÐÊÁÍÂèÒ§ÂÔè§ã¹¡ÒõԴµÑé§Ê¶Ò¹ÕµÃǨÇÑ´¹ÔǵÃ͹ÊÔÃÔ¹¸Ã

à¹×èͧ¨Ò¡¢éÍä´éà»ÃÕº¢Í§µÓá˹觷Õè´ÍÂÍÔ¹·¹¹·ì ¨ØÌÒŧ¡Ã³ìÁËÒÇÔ·ÂÒÅÑÂä´éÃѺ¡ÒúÃÔ¨Ò¤ÍØ»¡Ã³ìµÃǨÇÑ´¹ÔǵÃ͹¨Ò¡ÁËÒÇÔ·ÂÒÅѪԹ«Ù (Shinshu University) »ÃÐà·È­Õè»Øè¹ áÅÐä´éÃѺ¡ÒÃʹѺʹع¨Ò¡Í§¤ì¡Ã US National Science Foundation ¼èÒ¹·Ò§Ê¶ÒºÑ¹ÇԨѺÒÃì·ÍÅ ÁËÒÇÔ·ÂÒÅÑÂà´ÅÒáÇÃì »ÃÐà·ÈÊËÃÑ°ÍàÁÃÔ¡Ò ã¹´éÒ¹¡Òâ¹Êè§ÍØ»¡Ã³ì¨Ò¡­Õè»Øè¹ÁÒÂѧ»ÃÐà·Èä·Â ¹Í¡¨Ò¡¹Õé·Ò§¡ÅØèÁ¢Í§ÁËÒÇÔ·ÂÒÅÑÂà´ÅÒáÇÃì ÁËÒÇÔ·ÂÒÅѪԹ«Ù áÅÐÁËÒÇÔ·ÂÒÅÑÂá·ÊÁÒà¹Õ »ÃÐà·ÈÍÍÊàµÃàÅÕ ãËé¤ÇÒÁªèÇÂàËÅ×Í´éÒ¹¤Óá¹Ð¹ÓÊÓËÃѺ¡ÒõԴµÑé§Ê¶Ò¹ÕµÃǨÇÑ´¹ÔǵÃ͹ÊÔÃÔ¹¸Ã áÅÐÂѧä´éÃѺ¡ÒÃʹѺʹعà¾ÔèÁàµÔÁã¹´éÒ¹¢Í§ÇÑÊ´ØáÅФÃØÀѳ±ì¨Ò¡ÁËÒÇÔ·ÂÒÅÑÂÍغÅÃÒª¸Ò¹ÕáÅÐÊӹѡ§Ò¹¡Í§·Ø¹Ê¹ÑºÊ¹Ø¹¡ÒÃÇԨѠ(Ê¡Ç.)

¹Í¡¨Ò¡¹Õé ã¹ÃÐÂÐÂÒǤ³Ð¼ÙéÇÔ¨ÑÂÁÕà»éÒËÁÒ·Õè¨ÐºÃÔ¡ÒÃÇÔªÒ¡ÒÃã¹á§èÊÀÒ¾ÍÇ¡ÒÈ (space weather) «Öè§ËÁÒ¶֧¼Å¡Ãзº¢Í§¤Å×蹡ÃÐá·¡à¹×èͧ¨Ò¡¡ÒûзطÕè´Ç§ÍÒ·ÔµÂì·ÕèÁÕµèÍ¡Ô¨¡ÃÃÁ¢Í§Á¹ØÉÂì àªè¹ ¡ÒÃÊ×èÍÊÒà â·Ã¤Á¹Ò¤Á (¼Å¡Ãзº·Ò§ÊÀÒ¾ÍÇ¡ÒÈà¤Â·ÓãËé´ÒÇà·ÕÂÁ¾Ñ§¶Ö§¨Ó¹Ç¹ ñô ´Ç§) âç¼ÅԵ俿éÒ áÅФÇÒÁÁÑ蹤§¢Í§»ÃÐà·È à»ç¹µé¹ â´Â¤³Ð¼ÙéÇÔ¨ÑÂÂÔ¹´Õ·Ó˹éÒ·Õè»ÃÐÊÒ¹§Ò¹áÅÐãËé¤ÇÒÁÃÙé·Ò§ÇÔªÒ¡ÒáѺ˹èǧҹµèÒ§æ ·Õèà¡ÕèÂÇ¢éͧ㹻ÃÐà·Èä·Â

                Neutron monitors, first developed by the late J. A. Simpson at the University of Chicago in about 1948, are the best way to study GeV-energy cosmic rays (e.g., energetic particles from space) as a function of time.  These are very stable detectors set up in various locations around the world, to take advantage of the Earth’s magnetic field as an energy-selective magnetic spectrometer.  With only minimal maintenance, such a detector can provide valuable scientific information for decades. 

    Thailand (along with Burma and eastern India) is in a unique location, at the Earth’s magnetic equator and close to the offset dipole center.  Therefore, a neutron monitor at high altitude in Thailand would provide new, unique, and important scientific information about high-energy cosmic rays.  [Note that a “neutron” monitor measures secondary neutrons cased by the collisions of primary cosmic ray ions into the Earth’s atmosphere, so they really measure the cosmic ray ion flux.]

    In addition to basic astrophysical interest, time variations in the cosmic ray count rate are closely related to solar storms that can disable satellites and radio communications near Earth.  Neutron monitor data can help give advanced warning of such “space weather” effects at Earth, as explained in previous research in Thailand [Ruffolo, D. 1999, Astrophysical Journal, 515, 787; Leerungnavarat, K., Ruffolo, D., and Bieber, J. W. 2003, Astrophysical Journal, 593, 587].

   A high altitude is very important – the counting rate, and hence the scientific benefits, decrease exponentially with increasing atmospheric pressure (i.e., atmospheric overburden).  Therefore, a location near the summit of Doi Inthanon (Thailand's highest mountain) is highly desirable.

For more information on neutron monitors, visit the Bartol Research Institute Neutron Monitor Program

See also their English language summary of the Princess Monitor.

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ÃÙ»¶èÒ¢ͧ¡ÒÃÊ觵Ùé¤Í¹à·Ã¹à¹ÍÃì¢Í§Ê¶Ò¹ÕµÃǨÇÑ´¹ÔǵÃ͹ÊÔÃÔ¹¸ÃÁÒÂѧ ¤³ÐÇÔ·ÂÒÈÒʵÃì ¨ØÌÒŧ¡Ã³ìÁËÒÇÔ·ÂÒÅÑ áÅСÒÃÈÖ¡ÉҴ٧ҹʶҹյÃǨÇÑ´¹ÔǵÃ͹·Õè University of Tasmania »ÃÐà·ÈÍÍÊàµÃàÅÕÂ

Photos of the arrival of equipment for the Princess Sirindhon Neutron Monitor, in shipping containers, at Chulalongkorn University, and our trip to study neutron monitor physics at the University of Tasmania in Australia.

 

ÃÙ»¶èÒ¡Ò÷´ÊͺäÁâ¤ÃÁ͹ÔàµÍÃì (MicroMonitor)

Photos of a test setup at Chulalongkorn University: the MicroMonitor (one tube, no lead, no polyethylene reflector)

 

ÃÙ»¶èÒ¡Òâ¹ÂéÒµÙé¤Í¹à·Ã¹à¹ÍÃì¨Ò¡¤³ÐÇÔ·ÂÒÈÒʵÃì ¨ØÌÒŧ¡Ã³ìÁËÒÇÔ·ÂÒÅÑ à¾×èÍ¢¹Êè§ä»Âѧ˹èǧҹÀÙè¾ÔÊÔÉ  ÍÓàÀͨÍÁ·Í§  ¨Ñ§ËÇÑ´àªÕ§ãËÁè àÁ×èÍÇѹÍÒ·ÔµÂì·Õè 18 ¡ØÁÀҾѹ¸ì 2550 

Photoes of moving containers from Faculty of Science, Chulalongkorn University to Phupisit Chomthong Chieangmai on February 18, 2007

 

ÃÙ»¶èÒ¡ÒÃà´Ô¹·Ò§ä»ÂѧʶҹյÃǨÇÑ´¹ÔǵÃ͹ÊÔÃÔ¹¸Ã ³ ´ÍÂÍÔ¹·¹¹·ì ¨Ñ§ËÇÑ´àªÕ§ãËÁè ÃÐËÇèÒ§Çѹ·Õè 24 ¡ØÁÀҾѹ¸ì 2550  ¶Ö§ 1 ÁÕ¹Ò¤Á 2550

Photos of installation of 43 tons of lead and polyethylene during February 24 - March 1, 2007

 

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¢éÍÁÙÅ(Data)  [click à¾×èÍ´Ù¢éÍÁÙÅ]

 

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