Results 71 to 80 of about 9,470 (226)

Unique Observations of a Geomagnetic SI^+ -- SI^- Pair: Solar Sources and Associated Solar Wind Fluctuations

, 2010
The paper describes the occurrence of a pair of oppositely directed sudden impulses (SI), in the geomagnetic field ($\Delta$X), at ground stations, called SI${^{+}}$ -- SI${^{-}}$ pairs, that occurred between 1835 UT and 2300 UT on 23 April 1998. The SI${
A. C. Das, Bastian, Burlaga, Delaboudinière, Detman, Domingo, Dryer, Dryer, Dryer, Dungey, Eviatar, Fry, Gold, Goldstein, Goodrich, Gopalswamy, Heppner, Janardhan, Janardhan, Janardhan, Janardhan, Janardhan, K. Ahmed, Lazarus, Lu, McKenna-Lawlor, Mercier, Nishida, Odstrcil, P. Janardhan, R. G. Rastogi, Rastogi, Razdan, Rickett, Scherrer, Schrijver, Schwenn, Senior, Shen, Simnett, Simnett, Smart, Smith, Smith, Sonett, Sonett, Spiro, Stone, Susanta K. Bisoi, Takeuchi, Tóth, Vandegriff, Vasyliunas, Wolf   +53 more
core   +1 more source

A Panspermia Origin for Venus Cloud Life

Journal of Geophysical Research: Planets, Volume 131, Issue 4, April 2026.
Abstract Decades of study have hinted at the astrobiological potential of Venus's cloud layers. This potential is often cast as stemming from the idea that the Venusian surface was clement in the past. As the climate changed, life then remained in, or perhaps evolved and migrated to, the last habitable niche: the altitudes above ∼50 km with Earth‐like ...
E. Guinan, T. J. Austin, J. G. O’Rourke, N. G. Izenberg, E. A. Silber, E. Trembath‐Reichert   +5 more
wiley   +1 more source

MHD waves at the pre-front of interplanetary shocks on September 6 and 7, 2017

Solar-Terrestrial Physics
We analyze strong space weather disturbances during first ten days of September 2017, using the geomagnetic Dst index, parameters of normals to interplanetary shock fronts, direct measurements of interplanetary magnetic field, solar wind, and cosmic ray ...
Starodubtsev S. A., Shadrina L. P.
doaj   +1 more source

Why Coronal Mass Ejections Arrive Differently: Solar Cycle Modulation Through Solar Wind Structure

Space Weather, Volume 24, Issue 4, April 2026.
Abstract Coronal Mass Ejections (CMEs) are large structures of magnetized plasma ejected from the Sun's atmosphere into the heliosphere. The interaction of CMEs with the ambient solar wind during propagation affects arrival time and speed at Earth. Since the solar wind structure changes with the solar cycle, variability in the transit times and arrival
D. L. Gyeltshen, L. A. Barnard, M. J. Owens, P. Riley   +3 more
wiley   +1 more source

Associations between coronal mass ejections and interplanetary shocks [PDF]

, 1983
Nearly continuous complementary coronal observations and interplanetary plasma measurements for the years 1979-1982 are compared. It is shown that almost all low latitude high speed coronal mass ejections (CME's) were associated with shocks at HELIOS 1 ...
Howard, R. A., Koomen, M. J., Michels, D. J., Muhlhauser, K. H., Rosenbauer, H., Schwenn, R., Sheeley, N. R., Jr.   +6 more
core   +1 more source

Search for a simultaneous signal from small transient events in the Pierre Auger Observatory and the Tupi muon telescopes

, 2011
We present results of a search for a possible signal from small scale solar transient events (such as flares and interplanetary shocks) as well as possible counterparts to Gamma-Ray Burst (GRB) observed simultaneously by the Tupi muon telescope Niteroi ...
A. Fasso, C. E. Navia, C. R. A. Augusto, H. Asorey, K. H. Tsui, M. Casolino, T. Sinzi, V. Kopenkin, X. Bertou   +8 more
core   +1 more source

Multiple spacecraft observations of interplanetary shocks: Characteristics of the upstream ULF turbulence [PDF]

, 1982
All interplanetary shocks observed by ISEE-3 and either ISEE-1 or ISEE-2 or both in 1978 and 1979 are examined for evidence of upstream waves. In order to characterize the properties of these shocks it is necessary to determine accurate shock normals. An
Bame, S. J., Gosling, J. T., Russell, C. T., Smith, E. J., Tsurutani, B. T.   +4 more
core   +2 more sources

Global Impacts of Ultra‐Low‐Frequency Waves: 1. Thermospheric Responses and Traveling Atmospheric Disturbances

Geophysical Research Letters, Volume 53, Issue 6, 28 March 2026.
Abstract Ultra‐low‐frequency (ULF) waves cause local Thermosphere‐Ionosphere (T‐I) perturbations, but their impacts on the global T‐I system including the generation of Traveling Atmospheric Disturbances (TADs) have never been evaluated. The mechanisms responsible for the TAD generation and propagation, whether through dynamic or thermal process, are ...
Haonan Wu, Wenbin Wang, Xueling Shi, Dong Lin, Michael D. Hartinger, Joseph B. H. Baker, Shibaji Chakraborty   +6 more
wiley   +1 more source

Plasma properties of driver gas following interplanetary shocks observed by ISEE-3 [PDF]

, 1982
Plasma fluid parameters calculated from solar wind and magnetic field data obtained on ISEE 3 were studied. The characteristic properties of driver gas following interplanetary shocks was determined.
Ashbridge, J. R., Bame, S. J., Feldman, W. C., Gosling, J. T., Smith, E. J., Zwickl, R. D.   +5 more
core   +1 more source

Steady Collapse of Uranus' Exosphere After 1998 to the Present Decade

Geophysical Research Letters, Volume 53, Issue 6, 28 March 2026.
Abstract Uranus' thermospheric temperature decreased from ∼800K in 1986 to ∼450K in 2022 as determined from observations of H3+ and H2 infrared emissions. Spitzer 2007 lower atmosphere observations do not emulate this cooling trend. Here we show that the atomic H Lyman ⍺ emission from the disk of Uranus observed by HST from 2011 to 2022 are not ...
D. Bhattacharyya, J. T. Clarke, P. Stephenson, T. Koskinen, J.‐Y. Chaufray, L. Moore, H. Melin   +6 more
wiley   +1 more source