UNIVERSITY OF DELAWARE
BARTOL RESEARCH INSTITUTE
NEUTRON MONITOR PROGRAM

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South Pole Sunset 2002 Neutron Monitor in Foreground Welcome ! A neutron monitor is an instrument that measures the number of high-energy particles impacting Earth from space. For historical reasons these particles, mostly protons and helium nuclei, are called "cosmic rays." Because the intensity of cosmic rays hitting Earth is not uniform, it is important to place neutron monitors at multiple locations in order to form a complete picture of cosmic rays in space. Bartol Research Institute currently operates 6 neutron monitors. At this site, you can obtain information about our observing stations and learn why scientists study cosmic rays. You can view real-time data from the neutron monitors, and you can download past neutron monitor data.

	Acknowledgement. The Bartol Research Institute neutron monitor program is supported by the United States National Science Foundation under grants PLR-1245939 and PLR-1341562, and by the University of Delaware Department of Physics and Astronomy and Bartol Research Institute. Construction of the stations in Fort Smith, Peawanuck, and Nain was supported by NSF's Major Research Infrastructure Program.
Any opinions, findings and conclusions or recomendations expressed on this Website are those of the authors and do not necessarily reflect the views of the National Science Foundation (NSF).

Site Guide

• Stations.Some station names can be clicked for further information and, in some cases, photos.
• Listening for Cosmic Rays ! Nontechnical account of how neutron monitors work, why scientists study cosmic rays, and how cosmic rays affect our lives. Concentrates on the Inuvik (Canada) monitor, but the general concepts apply to all of our stations.
• Solar Modulation. Follow the solar modulation cycle ! This plot of sunspot number with McMurdo neutron rate is updated monthly.
• GLE Database. Official database of Neutron Monitor count rates during Ground Level Enhancements -- solar cosmic ray events intense enough to raise radiation levels on Earth's surface. GLE list.
• Building Nain neutron monitor. Nontechnical account of the construction of our neutron monitor station in Nain.
• Download Data.
• Preprints and Reprints.
• Selected Talks and Presentations.
• Personnel / Points of Contact.
• Links to Other Neutron Monitor and Space Weather Sites.

STATIONS

The Bartol Research Institute currently operates 10 neutron monitors:

McMurdo, Antarctica South Pole, Antarctica Thule, Greenland Newark, Delaware Mobile Monitor USCGC Polar Sea USCGC Polar Star

Inuvik, North West Territories Fort Smith, North West Territories Peawanuck, Ontario Nain, Labrador Goose Bay, Labrador

The monitors in Fort Smith, Peawanuck, and Nain are the newest stations in the Bartol network. They were constructed through a National Science Foundation Major Research Infrastructure grant, OPP-9724293. They began operating in Fall 2000.

PERSONNEL / POINTS OF CONTACT

	John Clem, Research Associate Professor, Principal Investigator jmc@udel.edu Bartol Research Institute 217 Sharp Lab University of Delaware Newark, DE 19716 U.S.A. Phone: 302-831-4354 FAX: 302-831-1637 Contact for: Science, Technical, Radiation Transport
	Paul Evenson, Professor, Co-Principal Investigator evenson@udel.edu Bartol Research Inst & Dept Physics and Astronomy 217 Sharp Lab University of Delaware Newark, DE 19716 U.S.A. Phone: 302-831-2988 FAX: 302-831-1637 Contact for: Science, Space Weather, Funding Issues, Technical
	James Roth, Electronics Technician roth@udel.edu Bartol Research Institute 217 Sharp Lab University of Delaware Newark, DE 19716 U.S.A. Phone: 302-831-0846 FAX: 302-831-1637 Contact for: Logistics, Technical
	Pierre-Simon Mangeard, Research Scientist mangeard@udel.edu Bartol Research Institute 217 Sharp Lab University of Delaware Newark, DE 19716 U.S.A. Contact for: Science, Data Requests, GLE alarm, Web Site
FORMER TEAM MEMBERS
	John W Bieber
	Len Shulman
	Chang-Hua Tsao
	Takao Kuwabara
	Roger Pyle

Links to Other Cosmic Ray and Space Weather Sites

• spaceweather.com
• NMDB , The Neutron Monitor DataBase
• The Izmiran Database
• The World Data Center for Cosmic Rays
• PSNM, Princess Sirindhorn Neutron Monitor at Doi Inthanon, Chiang Mai, Thailand
• SWPC, Space Weather Prediction Center, NOAA
• Kp index, GFZ Helmholt Centerm Potsdam
• Dst index, The Disturbance Storm Time index, NOAA