Schedule
Research Interest
Publications
Education
Awards


last revision: 11/1/2013

College of Natural and Social Sciences 

Department of Physics and Astronomy 

David T. Gregorich
Professor Emeritus of Physics and Astronomy


Office: Physical Science 421
Phone: (323) 343-2140
FAX: (323) 343-2497
Email: dgregor@calstatela.edu  or  dtg@calstatela.edu 


RESEARCH INTERESTS

Infrared and gamma-ray astronomy, atmospheric physics, theoretical physics. 


RECENT PUBLICATIONS AND PAPERS

Seasonal correlations of SST, water vapor, and convective activity in tropical oceans: a new hyperspectral data set for climate modeling.
Aumann, H.H., Gregorich, D., Broberg, S., Elliott, D., Geophys. Res. Lett., 34, L15813, doi: 10.1029/2006GL029191, 2007.

Contributions to climate studies from four years of hyperspectral data from the Atmospheric Infrared Sounder (AIRS)
Denis A. Elliot, Hartmut H. Aumann, David T. Gregorich, and L. Larrabee Strow, Proc. SPIE Vol.,6677 667714, doi: 10.1117/12.732662, 2007.

AIRS Observations of Deep Convective Clouds
Aumann, H.H., Gregorich, D., DeSouza-Machado, S.M., Proc. SPIE Vol.,6301 63010J, doi: 10.1117/12.681201, 2006.

Three Years of Atmospheric Infrared Sounder Radiometric Calibration Validation using Sea Surface Temperatures
Aumann, H. H., S. Broberg, D. Elliott, S. Gaiser, and D. Gregorich, J. Geophys. Res., 111, D16S90, doi:10.1029/2005JD006822, 2006.

Evaluation of AIRS, MODIS, and HIRS 11 Micron Brightness Temperature Difference Changes from 2002 through 2005
S. E. Broberg, H. H. Aumann, D. T. Gregorich and X. Xiong, Proc. SPIE Vol., 6296, 62960J, doi:10.1117/12.681049, 2006.

Lessons from three years of hyperspectral data from theAtmospheric Infrared Sounder (AIRS) on the EOS AQUA
H. H. Aumann, D. Elliot, and D. T. Gregorich, Proc. SPIE Vol., 6233, 623318, doi:10.1117/12.666222, 2006.

Atmospheric Infrared Sounder Data for the Evaluation of Upper Tropospheric Water Maps for Short Term Weather Forecasting
Hartmut H. Aumann, David Gregorich and Ed Dobkowski, Proc. SPIE Vol., 5890, 58900T, doi:10.1117/12.617596, 2005.

Atmospheric Infrared Sounder Hyper-spectral Measurements for Climate Research: Carbon Dioxide and Nitrous Oxide effects
H. H. Aumann, David Gregorich and Steve Gaiser, Geophys. Res. Lett., 32, L05806, doi:10.1029/2004GL021784, 2005.

Application of Atmospheric Infrared Sounder (AIRS) Data to Climate Research
Hartmut H. Aumann, David Gregorich, Steve Gaiser and Moustafa T. Chahine, Proc. SPIE, 5570, 202, September 2004.

Spectral Cloud Filtering of AIRS Data: Non-Polar Ocean
H.H. Aumann, David Gregorich and Diana Barron, Proc. SPIE, 5548, 313, August 2004.

In-flight refinement of the radiometric, spectral, and spatial calibration of the atmospheric infrared sounder (AIRS)
H.H. Aumann, S. Broberg, D.A. Elliott, S. Gaiser, D.T. Gregorich, T.J. Hearty, S.J. Licata, T.S. Pagano, K. Overoye, M. Weiler, Proc. SPIE, 5151, 232, August 2003.

Verification of AIRS Boresight Accuracy Using Coastline Detection
D.T. Gregorich and H.H. Aumann, IEEE Trans. Geosci. Remote Sensing, 41-2, 298, (2003).

Formulation and Validation of Simulated Data for the Atmospheric Infrared Sounder (AIRS)
E. Fishbein, C.B. Farmer, S.L. Granger, D.T. Gregorich, M.R. Gunson, S.E. Hannon, M. Hofstadter, S.-Y. Lee, S.S. Leroy, and L.L. Strow, IEEE Trans. Geosci. Remote Sensing, 41-2, 314, (2003).

The STACEE-32 Ground Based Gamma-ray Detector
D.S. Hanna, D. Bhattacharya, L.M. Boone, M.C. Chantell, Z. Conner, C.E. Covault, M. Dragovan, P. Fortin, D.T. Gregorich, J.A. Hinton, R. Mukherjee, R.A. Ong, S. Oser, K. Ragan, R.A. Scalzo, D.R. Schuette, C.G. Theoret, T.O. Tumer, D.A. Williams, J.A. Zweerink, Nuclear Instruments and Methods A419, 126 (2002).

Early calibration results from the atmospheric infrared sounder (AIRS) on Aqua
T.S. Pagano, H.H. Aumann, S.L. Gaiser, D.T. Gregorich, Proc. SPIE, 4891, 76 October 2002.

High Energy Gamma-Ray Observations of the Crab Nebula and Pulsar with the Solar Tower Atmospheric Cherenkov Effect Experiment
S. Oser, D. Bhattacharya, L.M. Boone, M.C. Chantell, Z. Conner, C.E. Covault, M. Dragovan, P. Fortin, D.T. Gregorich, D.S. Hanna, R. Mukerjee, R.A. Ong, K. Ragan, R.A. Scalzo, D.R. Schuette, C.G. Theoret, T.O. Tumer, D.A. Williams, J.A. Zweerink, Ap. J., 547, 949, (2001).

Performance of the STACEE Atmospheric Cherenkov Telescope
D. A. Williams, D. Bhattacharya, L. M. Boone, M. C. Chantell, Z. Conner, C. E. Covault, M. Dragovan, P. Fortin, D. Gingrich, D. T. Gregorich, D. S. Hanna, G. Mohanty, R. Mukherjee, R. A. Ong, S. Oser, K. Ragan, R. A. Scalzo, D. R. Schuette, C. G. Theoret, T. O. Tumer, F. Vincent, J. A. Zweerink, Proceedings of the Heidelberg Symposium on High-Energy Gamma-Ray Astronomy, June 2000, AIP Conf. Proc. 558, 544 (2001).

STACEE: Instrument performance and future plans
C. E. Covault, D. Bhattacharya, L. Boone, M. C. Chantell, Z. Conner, M. Dragovan, D. Gingrich, D. Gregorich, D. S. Hanna, R. Mukherjee, R. A. Ong, S. Oser, K. Ragan, R. A. Scalzo, C. G. Théoret, T. O. Tumer, D. A. Williams, and J. A. Zweerink, Proceedings of the Snowbird GeV-TeV Gamma Ray Astrophysics Workshop, AIP Conf. Proc. 515, 411 (1999).

Observations of the Crab Nebula and Pulsar with the STACEE Detector [PDF format]
S. Oser, D. Bhattacharya, L. Boone, M.C. Chantell, Z. Conner, C.E. Covault, M. Dragovan, D.T. Gregorich, D.S. Hanna, R. Mukerjee, R.A. Ong, K. Ragan, R.A. Scalzo, C.G. Theoret, T.O. Tumer, D.A. Williams, J.A. Zweerink, Proceedings of the 26th International Cosmic Ray Conference (Salt Lake City), 3, 464, (1999).

Studies of AGN using the Solar Tower Atmospheric Cherenkov Effect Experiment (STACEE) [PDF format]
R. Mukherjee, D. Bhattacharya, L. Boone, M.C. Chantell, Z. Conner, C.E. Covault, M. Dragovan, D.T. Gregorich, D.S. Hanna, R.A. Ong, S. Oser, K. Ragan, R.A. Scalzo, C.G. Theoret, T.O. Tumer, D.A. Williams, J.A. Zweerink, Proceedings of the 26th International Cosmic Ray Conference (Salt Lake City), 3, 362, (1999).

Operation and Performance of the Solar Tower Atmospheric Cherenkov Effect Experiment (STACEE) [PDF format]
C.E.Covault, D. Bhattacharya, L. Boone, M.C. Chantell, Z. Conner, M. Dragovan, D.T. Gregorich, D.S. Hanna, R. Mukherjee, R.A. Ong, S. Oser, K. Ragan, R.A. Scalzo, C.G. Theoret, T.O. Tumer, D.A. Williams, J.A. Zweerink, Proceedings of the 26th International Cosmic Ray Conference (Salt Lake City), 2, 365, (1999).

Progress and Recent Results from the Solar Tower Atmospheric Cherenkov Effect Experiment (STACEE)
Covault, C. E.; Chantell, M. C.; Conner, Z.; Dragovan, M.; Oser, S.; Ong, R. A.; Scalzo, R. A.; Bhattacharya, D.; Tumer, O. T.; Zweerink, J. A.; Boone, L.; Williams, D. A.; Gregorich, D.T.; Hanna, D. S.; Ragan, K.; Theoret, C.; Mukerjhee, R., Bulletin of the AAS, 194, #09.07, (1999).

Prototype Test Results of the Solar Tower Atmospheric Cherenkov Effect Experiment (STACEE)
M.C. Chantell, D. Bhattacharya, C.E. Covault, M. Dragovan, R. Fernholz, D.T. Gregorich, D.S. Hanna, G.H. Marion, R.A. Ong, S. Oser, T.O. Tumer, and D.A. Williams, Nuclear Instruments and Methods, A408, 468 (1998).

Current Status and Plans for the Solar Tower Atmospheric Cherenkov Effect Experiment (STACEE)
Chantell, M. C.; Conner, Z.; Covault, C. E.; Dragovan, M.; Ong, R. A.; Oser, S.; Hanna, D. S.; Ragan, K.; Theoret, C.; Bhattacharya, D.;Tumer, O. T.; Johnson, R.; Williams, D. A.; Mukerjhee, R.; Gregorich, D.T.; Coppi, P., Bulletin of the AAS, 191, #126.07, (1997).

Current and Projected Capabilities of the Solar Tower Atmospheric Cherenkov Effect Experiment (STACEE) for gamma -ray Astronomy below 100 GeV.
Chantell, M.C.; Covault, C.E.; Dragovan M.; Ong, R.A.; Oser S.; Bhattacharya, D.; Tumer, O.T.; Gregorich, D.T.; Hanna, D.S.; Williams, D.A., Bulletin of the AAS, 190, #53.07, (1997)

Solar Tower Atmospheric Cherenkov Effect Experiment (STACEE) for Ground Based Gamma Ray Astronomy.
Bhattacharya, D.; Chantell, M. C.; Coppi, P.; Covault, C. E.; Dragovan, M.; Gregorich, D.T.; Hanna, D. S.; Mukerjhee, R.; Ong, R. A.; Oser, S.; Ragan, K.; Tumer, O. T.; Williams, D. A., Proceedings of the Fourth Compton Symposium, Editors Charles D. Dermer, Mark S. Strickman, and James D. Kurfess, Williamsburg, VA April 1997: AIP Conf. Proc. 410, p. 1626.

Detection of Atmospheric Cherenkov Radiation using Solar Heliostat Mirrors
R.A. Ong, D. Bhattacharya, C.E. Covault, D.D. Dixon, D.T. Gregorich, D.S. Hanna, S. Oser, J. Quebert, D.A. Smith, O.T. Tumer, and A. Zych, Astroparticle Physics, 5, 353, (1996).

Study of Deep IRAS Fields at 60 microns
D.T. Gregorich, G. Neugebauer, B.T. Soifer, J.E. Gunn, and T.L. Herter, Astronomical Journal, 110, 259, (1995).

Exploratory On-site Atmospheric Cherenkov Radiation Tests at Solar Two
Tumer, T. O.; Ong, R.; Bhattacharya, D.; Covault, C. E.; Dixon, D. D.; Gregorich, D.; Hanna, D. S.; Smith, D.; Oser, S.; Zych, A. D., Bulletin of the AAS, 185, #16.01 (1994).

IRAS sky survey atlas: Explanatory supplement
Wheelock, S. L.; Gautier T. N.; Chillemi, J.; Kester, D.; McCallon, H.; Oken C.; White J.; Gregorich, D.; Boulanger, F.; Good, J., NSSDC, Washington, D.C. , 95-22539, (1994)

AIRS Simulation Study: Development of Simulation Algorithms for the Atmospheric Infrared Sounder
S.-Y. Lee, H. H. Aumann, M. Chahine, D. Gregorich, R. Haskins, EOS Suppl., 74, 43-72 (1993).


EDUCATIONAL BACKGROUND

Ph.D., Physics, 1968, University of California. Riverside 
   NDEA Title IV Fellow, 1964-1968
   California State Graduate Fellow, 1967-1968
M.S., Physics/Mathematics, 1964, California State College at Los Angeles 
B.A., Mathematics, 1962, University of California, Los Angeles 


AWARDS

NASA Group Achievement Award, Atmospheric Infrared Sounder Project Calibration Team, October 2003 
NASA Group Achievement Award, Aqua Mission Team, August 2003 
NASA Group Achievement Award, Atmospheric Infrared Sounder Project Team, August 2003 
Goddard Space Flight Center, NASA Outstanding Teamwork Award, Earth Observing System (EOS) Aqua Mission Team, May 2003 
NASA Group Achievement Award, Infrared Astronomical Satellite (IRAS) Sky Survey Atlas Team, June 1992 
NASA Group Achievement Award, Infrared Astronomical Satellitea (IRAS) Scientific Data Analysis Team, October 1984 


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