Robert H. Holzworth
Professor of Earth & Space Science and
Adjunct Professor of Physics
Earth and Space Sciences
Room 263 Johnson Hall
(206) 685-7410 (office)
(206) 685-3815 (fax)
the MASS rocket campaign,
Ph.D., Physics, University of California, Berkeley, 1977.
Asst. Res. Physicist, Space Science Lab, UC Berkeley, 1977 - 8.
Member of the Technical Staff, Space Science Lab, The Aerospace Corp., Los Angeles, 1978-82
UW Faculty since 1982
Experimental space plasma physics, atmospheric and magnetospheric electrodynamics, middle atmosphere electrodynamics, thunderstorm and lightning electrodynamics.
My research involves the experimental investigation of electrical parameters in the Earth's environment, in particular, the study of the electromagnetic energy flow that couples separated environments such as the atmosphere, the ionosphere, and the magnetosphere. Active projects include: CAREII dusty-plasma rocket experiment Electric field measurements in F-region ionosphere to be launched from Norway in 2013 (NRL support); C/NOFS Optical Lightning Detector in the VEFI electric field experiment launched Apr 2008 into equatorial orbit to study ionospheric irregularities (NASA and USAF sponsored), and real time global lightning studies using VLF techniques with the WWLL (World Wide Lightning Location network) (see wwlln.net for more information) and experiments to use lightning as a powerful radar to probe the D-region. Additionally, proposals in the works for new balloon flights.
Students are encouraged to be vitally involved in hardware projects and data analysis in all of these research areas. All instruments are built in our lab by the students or the professional engineering staff. Most projects include the opportunity for student travel.
Email Bob at email@example.com .
PUBLICATIONS since 2004 (from a total list of over 120)
WWLL global lightning detection system: Regional validation study in Brazil, GEOPHYSICAL RESEARCH LETTERS, VOL. 31, L03102, doi:10.1029/2003GL018882, 2004 (with Erin H. Lay, Craig J. Rodger, Jeremy N. Thomas, Osmar Pinto Jr., and Richard L. Dowden)
High-Voltage Electric Field Instrument for Studying Sprites, IEEE TRANSACTIONS
measurements in noctilucent clouds, JOURNAL OF GEOPHYSICAL RESEARCH,
C/NOFS: a Mission to Forecast Scintillations, JASTP, (accepted and in press, 2004 (with O. de La Beaujardire and the rest of the C/NOFS science definition team)
Potential distribution around sounding rockets in mesospheric layers with charged aerosol particles, GEOPHYSICAL RESEARCH LETTERS, accepted, Oct. 2004, (In press) (with Z. Sternovsky, M. Horányi and S. Robertson)
Balloon Observations of Temporal and Spatial Fluctuations in Stratospheric Conductivity, Submitted to Elsevier Science, October, 2004, (with Edgar A. Bering, III, Brandon D. Reddell , Michael F. Kokorowski , Akira Kadokura , Hisao Yamagishi , Natsuo Sato, Masaki Ejiri, Haruto Hirosawa, Takamasa Yamagami, Shoji Torii, Fumio Tohyamaf, Michio Nakagawa, and Toshimi Okada
Strong electric fields from positive lightning strokes in the stratosphere, Geophys. Res. Lett., V. 32, L04809, doi:10.1029/2004GL021554, 2005 (with M. P. McCarthy, J. N. Thomas, J. Chin, T. M. Chinowsky, M. J. Taylor, and O. Pinto Jr.,)
in the natural variance in stratospheric conductivity - Implications for
studies of long-term changes Source: Advances in Space Research,
v 35, n 8
.Lightning sferics and
stroke-delayed pulses measured in the stratosphere: Implications for
mesospheric currents, Geophysical Res. Lett,
Balloon observations of temporal variation in the global circuit compared to global lightning activity, Advances in Space Research 36 (2005) 2223–2228
Predicting lightning-driven quasi-electrostatic fields at sprite altitudes usin in situ measurements and a numerical model, Geophysical Research Letters, v 32, n 10, 28 May 2005. (with Thomas, J.N.; McCarthy, M.P.; Pinto, O., Jr)
Balloon observations of temporal and spatial fluctuations in stratospheric conductivity, Advances in Space Research, v 35, n 8, 2005, p 1434-49 (with Bering, E.A., III, Reddell, B.D. ; Kokorowski, M.F.; Kadokura, A.; Yamagishi, H.; Sato, N.; Ejiri, M.; Hirosawa, H.; Yamagami, T.; Torii, S.; Tohyama, F.; Nakagawa, M.; Okada, T.,)
Rapid fluctuations of stratospheric electric field following a solar energetic particle event, Geophysical Research Letters, v 33, n 20, 28 Oct. 2006, p 6 pp (with Kokorowski, M., Sample, J.G.., Bering, E.A.; Bale, S.D.; Blake, J.B.; Collier, A.B.; Hughes, A.R.W.; Lay, E.; Lin, R.P.; McCarthy, M.P.; Millan, R.M.; Moraal, H.; O'Brien, T.P.; Parks, G.K.; Pulupa, M.; Reddell, B.D.; Smith, D.M.; Stoker, P.H.; Woodger, L.)
Detection efficiency of the VLF World-Wide Lightning Location Network (WWLLN): initial case study, Ann. Geophys., 24, 3197–3214, 2006 (with Rodger, C. J., S. Werner, J. B. Brundell, E. H. Lay, N. R. Thomson, and R. L. Dowden)
Performance assessment of the World Wide Lightning Location Network (WWLLN), using the Los Alamos Sferic Array (LASA) as ground truth Source: Journal of Atmospheric and Oceanic Technology, v 23, n 8, Aug. 2006, p 1082-92 (with Jacobson, A.R., Harlin, J.; Dowden, R.; Lay, E.)
A Very Active Sprite-Producing Storm Observed Over Argentina, Eos, Vol. 88, No. 10, 6 March 2007, PAGES 117–128 (My post doc) (with Thomas, Jeremy N; Michael J. Taylor, Dominique Pautet, and Matthew Bailey,; Natalia N. Solorzano,, Michael P. McCarthy, Michael Kokorowski, Fernanda Sao Sabbas, Osmar Pinto Jr; Steven A. Cummer, Nicolas Jaugey, and Jingbo Li, Nelson Jorge Schuch)
Local Time Variation in Land/Ocean Lightning Count Rates as Measured by the World Wide Lightning Location Network, Journal of Geophysical Research-Part D-Atmospheres, v 112, n 13, 16 July 2007, p D13111-1-9 (with Lay, Erin, H., Abram R. Jacobson, Craig J. Rodger, and Richard L. Dowden)
Low-frequency ionospheric sounding with Narrow Bipolar Event lightning radio emissions: energy-reflectivity spectrum, Ann. Geophys., 26, 1793-1803, 2008 (with Jacobson A. R. and X.-M. Shao)
Rare Measurements of a Sprite with Halo Event Driven by a Negative Lightning Discharge Over Argentina, Geophys. Res. Lett., VOL.35, L14812, doi:10.1029/2008GL033984, 2008 (with Taylor, M. J., M. A. Bailey, P. D. Pautet, S. A. Cummer, N. Jaugey, J. N. Thomas, N. N. Solorzano, F. S. Sabbas, O. Pinto, and N. J. Schuch )
Magnetospheric electric field variations caused by storm-time shock fronts, Advances in Space Research, v 42, n 1, 1 July 2008, p 181-91 (with Kokorowski, M., Bering, E.A., III; Ruohoniemi, M.; Sample, J.G..; Bale, S.D.; Blake, J.B.; Collier, A.B.; Hughes, A.R.W.; Lay, E.H.; Lin, R.P.; McCarthy, M.P.; Millan, R.M.; Moraal, H.; O'Brien, T.P.; Parks, G.K.; Pulupa, M.; Reddell, B.D.; Smith, D.M.; Stoker, P.H.; Woodger,)
In situ measurements of contributions to the global electrical circuit by a thunderstorm in southeastern Brazil, Atmospheric Research, In Press, Accepted Manuscript, Available online 16 September 2008 (with Thomas, Jeremy N.and, Michael P. McCarthy)
Lightning-driven electric fields measured in the lower ionosphere: Implications for transient luminous events, J. Geophys. Res. (Space Physics) Accepted and in press, (2008JA013567R), 2008 (with Thomas, J. N., B. H. Barnum, E. H. Lay, M. Co and M. C. Kelley)
reflection of lightning long-wave radio pulses from the ionospheric D region:
Numerical model with Abram R. Jacobson, and Xuan-Min Shao, , JOURNAL OF
Electric field measurements in a NLC/PMSE region during the MASS/ECOMA campaign, with M. Shimogawa, Ann. Geophys., 27, 1423–1430, 2009
Mass analysis of charged aerosol particles in NLC and PMSE during the ECOMA/MASS campaign, with Robertson, S., M. Horanyi, S. Knappmiller, Z. Sternovsky, M. Shimogawa, M. Friedrich, K. Torkar, J. Gumbel, L. Megner, G. Baumgarten, R. Latteck, M. Rapp, U.-P. Hoppe, and M. E. Hervig, Ann. Geophys., 27, 1213–1232, 2009
Simultaneous observations of Pc 1 micropulsation activity and stratospheric electrodynamic perturbations on 27 January 2003, with Bering, E.; Engebretson, M. ; Holzworth, R.; Kadokura, A.; Kokorowski, M.; Reddell, B.; Posch, J.; Yamagishi, H., , Advances in Space Research, v 43, n 5, p 802-818, March 2, 2009
Spectral dependence of terrestrial gamma-ray flashes on source distance, with Hazelton B. J., B. W. Grefenstette, D. M. Smith, J. R. Dwyer, X.-M. Shao, S. A. Cummer, T. Chronis, and E. H. Lay, (2009), , Geophys. Res. Lett., 36, L01108, doi:10.1029/2008GL035906.
Characteristics, of an African Easterly Wave Observed During NAMMA, with Cifelli, Robert, Timothy Lang, Steven A. Rutledge, Nick Guy, Edward J. Zipser, and Jon Zawislak, Journal of the Atmospheric Sciences, Vol. 67, No. 1, pp. 3-25, January 2010.
Polarity and energetics of inner core lightning in three intense North Atlantic hurricanes, with Jeremy N. Thomas, Natalia N. Solorzano, and Steven A. Cummer, J. Geophys. Res., VOL. 115, doi:10.1029/2009JA014777, 2010
Growing detection efficiency of the world wide lightning location network, with Rodger, C.J., Brundell, J.B.;and Lay, E.H, , AIP Conference Proceedings (refereed), v 1118, p 15-20, 2009.
Full-wave reflection of lightning long-wave radio pulses from the ionospheric D-region: Comparison with midday observations of broadband lightning signals, with Abram R. Jacobson and Xuan-Min Shao,, , J. Geophys. Res., 2009JA014540RR, (Accepted and in press), 2010
Ground-based detection of sprites and their parent lightning flashes over Africa during the 2006 AMMA campaign, with E. R. Williams, W. A. Lyons, Y. Hobara, V. C. Mushtak, N. Asencio, R. Boldi, J. Bór, S. A. Cummer, E. Greenberg, M. Hayakawa, V. Kotroni, J. Li, C. Morales, T. E. Nelson, C. Price, B. Russell, M. Sato, G. Sátori, K. Shirahata, Y. Takahashi, K. Yamashita, , Q. J. R. Meteorol. Soc. (2009), DOI: 10.1002/qj.489
First Results on Terrestrial Gamma-ray Flashes from 1the Fermi Gamma-ray Burst Monitor, withBriggs, M. S., G. J. Fishman, V. Connaughton, P. N. Bhat, W. S. Paciesas, R. D. Preece, C. Wilson‐Hodge, V. L. Chaplin, R. M. Kippen, A. von Kienlin, C. A. Meegan, E. BissaldJ. R. Dwyer, D. M. Smith, J. E. Grove, and A. Chekhtman, , . Geophys. Res., VOL. 115, A07323, doi:10.1029/2009JA015242, 2010
Lightning-generated NOx seen
Associations between Fermi Gamma‐ray Burst Monitor terrestrial gamma ray flashes and sferics from the World Wide Lightning Location Network with Connaughton, V., M. S. Briggs, M. L. Hutchins, G. J. Fishman, C. A. Wilson‐Hodge, V. L. Chaplin, P. N. Bhat, J. Greiner, A. von Kienlin, R. M. Kippen, C. A. Meegan, W. S. Paciesas, R. D. Preece, E. Cramer, J. R. Dwyer, and D. M. Smith, , J. Geophys. Res, V. 115, A12307, doi:10.1029/2010JA015681, 2010.
A performance assessment of theWorldWide Lightning Location Network (WWLLN) via comparison with the
Canadian Lightning Detection Network (
modeling of non-linear electron density enhancement due to successive lightning
strokes with Lay, Erin H. ,
Craig J. Rodger, Mengu Cho, and Jeremy N. Thomas, JOURNAL OF G
Study of oblique whistlers in the low-latitude ionosphere, jointly with the C/NOFS satellite and theWorld-Wide Lightning Location Network with Jacobson, A. R., R. F. Pfaff, and M. P. McCarthy, , Ann. Geophys., 29, 851–863, doi:10.5194/angeo-29-851-2011, 2011
Daily and intraseasonal relationships between lightning and NO2 over the Maritime Continent, with Katrina S Virts, Joel A. Thornton, John M. Wallace, Michael L. Hutchins, and Abram R. Jacobson, Geophys. Res. Lett., V. 38, L19803, doi:10.1029/2011GL048578, 2011
Observations of multi-microsecond VHF pulsetrains in intracloud lightning discharges, with, A. R Jacobson. and X.-M. Shao, , Ann. Geophys., 29, 1587–1604, 2011.
Initial studies with the Lightning Detector on the C/NOFS satellite, and cross-validation with WWLLN, with A. R. Jacobson, M. P. McCarthy, and R. P.Pfaff, Journal of Atmospheric and Oceanic Technology (JTech) DOI: 10.1175/JTECH-D-11-00047.1, V. 28, p. 1423, 2011
(updated Nov 2011)
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