Search Results - "Eparvier, Frank"

Photochemical escape of oxygen from Mars: First results from MAVEN in situ data by Lillis, Robert J., Deighan, Justin, Fox, Jane L., Bougher, Stephen W., Lee, Yuni, Combi, Michael R., Cravens, Thomas E., Rahmati, Ali, Mahaffy, Paul R., Benna, Mehdi, Elrod, Meredith K., McFadden, James P., Ergun, Robert. E., Andersson, Laila, Fowler, Christopher M., Jakosky, Bruce M., Thiemann, Ed, Eparvier, Frank, Halekas, Jasper S., Leblanc, François, Chaufray, Jean‐Yves

“…Photochemical escape of atomic oxygen is thought to be one of the dominant channels for Martian atmospheric loss today and played a potentially major role in…”
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Ionizing Electrons on the Martian Nightside: Structure and Variability by Lillis, Robert J., Mitchell, David L., Steckiewicz, Morgane, Brain, David, Xu, Shaosui, Weber, Tristan, Halekas, Jasper, Connerney, Jack, Espley, Jared, Benna, Mehdi, Elrod, Meredith, Thiemann, Edward, Eparvier, Frank

“…The precipitation of suprathermal electrons is the dominant external source of energy deposition and ionization in the Martian nightside upper atmosphere and…”
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Effects of a Solar Flare on the Martian Hot O Corona and Photochemical Escape by Lee, Yuni, Dong, Chuanfei, Pawlowski, Dave, Thiemann, Edward, Tenishev, Valeriy, Mahaffy, Paul, Benna, Mehdi, Combi, Michael, Bougher, Stephen, Eparvier, Frank

“…We examine for the first time the flare‐induced effects on the Martian hot O corona. The rapid ionospheric response to the increase in the soft X‐ray flux…”
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MAVEN observations of dayside peak electron densities in the ionosphere of Mars by Vogt, Marissa F., Withers, Paul, Fallows, Kathryn, Andersson, Laila, Girazian, Zachary, Mahaffy, Paul R., Benna, Mehdi, Elrod, Meredith K., Connerney, John E. P., Espley, Jared R., Eparvier, Frank G., Jakosky, Bruce M.

“…The peak electron density in the dayside Martian ionosphere is a valuable diagnostic of the state of the ionosphere. Its dependence on factors like the solar…”
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Martian Bow Shock Oscillations Driven by Solar Wind Variations: Simultaneous Observations From Tianwen‐1 and MAVEN by Cheng, Long, Lillis, Robert, Wang, Yuming, Mittelholz, Anna, Xu, Shaosui, Mitchell, David L., Johnson, Catherine, Su, Zhenpeng, Halekas, Jasper S., Langlais, Benoit, Zhang, Tielong, Wang, Guoqiang, Xiao, Sudong, Zou, Zhuxuan, Wu, Zhiyong, Chi, Yutian, Pan, Zonghao, Liu, Kai, Hao, Xinjun, Li, Yiren, Chen, Manming, Espley, Jared, Eparvier, Frank

“…The Martian bow shock stands as the first defense against the solar wind and shapes the Martian magnetosphere. Previous studies showed the correlation between…”
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Modeling the ionospheric E and F1 regions: Using SDO-EVE observations as the solar irradiance driver by Sojka, Jan J., Jensen, Joseph, David, Michael, Schunk, Robert W., Woods, Tom, Eparvier, Frank

“…ABSTRACTOver the altitude range of 90–150 km, in dayside nonauroral regions, ionization is controlled almost entirely by solar ultraviolet irradiance; the…”
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The SOLAR2000 empirical solar irradiance model and forecast tool by Tobiska, W.Kent, Woods, Tom, Eparvier, Frank, Viereck, Rodney, Floyd, Linton, Bouwer, Dave, Rottman, Gary, White, O.R.

“…SOLAR2000 is a collaborative project for accurately characterizing solar irradiance variability across the spectrum. A new image- and full-disk proxy empirical…”
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Characterizing Precipitation Behaviors of H− in the Martian Atmosphere by Henderson, Sarah, Halekas, Jasper, Jolitz, Rebecca, Mitchell, David, Mazelle, Christian, Eparvier, Frank, Elrod, Meredith

“…Solar wind protons can charge exchange with the extensive hydrogen corona of Mars, resulting in a significant flux of energetic neutral atoms (ENAs). As these…”
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Observations and Modeling of the Mars Low‐Altitude Ionospheric Response to the 10 September 2017 X‐Class Solar Flare by Xu, Shaosui, Thiemann, Ed, Mitchell, David, Eparvier, Frank, Pawlowski, David, Benna, Mehdi, Andersson, Laila, Liemohn, Michael W., Bougher, Stephen, Mazelle, Christian

“…Solar extreme ultraviolet and X‐ray photons are the main sources of ionization in the Martian ionosphere and can be enhanced significantly during a solar…”
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First Synoptic Images of FUV Discrete Aurora and Discovery of Sinuous Aurora at Mars by EMM EMUS by Lillis, Robert J., Deighan, Justin, Brain, David, Fillingim, Matthew, Jain, Sonal, Chaffin, Michael, England, Scott, Holsclaw, Greg, Chirakkil, Krishnaprasad, Al Matroushi, Hessa, Lootah, Fatma, Al Mazmi, Hoor, Thiemann, Ed, Eparvier, Frank, Schneider, Nick, Curry, Shannon

“…We present the first measurements of Mars discrete aurora in the extreme ultraviolet (<110 nm) and the first synoptic aurora images in the far ultraviolet…”
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The Hazard of UV-Induced Oxidation to Solar-Viewing Spacecraft Optics by Tarrio, Charles, Lucatorto, Thomas B., Berg, Robert F., Newbury, Dale E., Ritchie, Nicholas W. M., Jones, Andrew R., Eparvier, Frank

“…The two most prevalent outgassing contaminants on spacecraft are organic molecules and water vapor. Adsorbed organic molecules can degrade a solar-viewing…”
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EMM EMUS Observations of Hot Oxygen Corona at Mars: Radial Distribution and Temporal Variability by Chirakkil, Krishnaprasad, Deighan, Justin, Chaffin, Michael S., Jain, Sonal K., Lillis, Robert J., Raghuram, Susarla, Holsclaw, Greg, Brain, David A., Thiemann, Ed, Chamberlin, Phil, Fillingim, Matthew O., Evans, J. Scott, England, Scott, AlMatroushi, Hessa, AlMazmi, Hoor, Eparvier, Frank, Gacesa, Marko, El‐Kork, Nayla, Curry, Shannon M.

“…We present the first observations of the dayside coronal oxygen emission in far ultraviolet (FUV) measured by the Emirates Mars Ultraviolet Spectrometer (EMUS)…”
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Morphology of Extreme and Far Ultraviolet Martian Airglow Emissions Observed by the EMUS Instrument on Board the Emirates Mars Mission by Jain, Sonal K., Deighan, Justin, Chaffin, Mike, Holsclaw, Greg, Lillis, Rob, Fillingim, Matt, Evans, J. Scott, Correira, John, AlMatroushi, Hessa, Lootah, Fatma, England, Scott, AlMazmi, Hoor, Thiemann, Ed, Chamberlin, Phil, Eparvier, Frank

“…We present the first continuous observations of the extreme and far ultraviolet (EUV and FUV) dayglow emissions measured by Emirates Mars Ultraviolet…”
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Combined Analysis of Hydrogen and Oxygen 102.6 nm Emission at Mars by Chaffin, Michael S., Deighan, Justin, Jain, Sonal, Holsclaw, Greg, AlMazmi, Hoor, Chirakkil, Krishnaprasad, Correira, John, England, Scott, Evans, J. Scott, Fillingim, Matt, Lillis, Rob, Lootah, Fatma, Raghuram, Susarla, Eparvier, Frank, Thiemann, Ed, Curry, Shannon, AlMatroushi, Hessa

“…Water is lost from the Mars upper atmosphere to space as hydrogen and oxygen, both of which can be observed in scattered ultraviolet sunlight at 102.6 nm. We…”
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Ionization Efficiency in the Dayside Ionosphere of Mars: Structure and Variability by Lillis, Robert, Xu, Shaosui, Mitchell, David, Thiemann, Ed, Eparvier, Frank, Benna, Mehdi, Elrod, Meredith

“…Ionization efficiency, the ratio between photoelectron impact ionization and primary photoionization, is an important quantity from the perspective of…”
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Mars heavy ion precipitating flux as measured by Mars Atmosphere and Volatile EvolutioN by Leblanc, F., Modolo, R., Curry, S., Luhmann, J., Lillis, R., Chaufray, J. Y., Hara, T., McFadden, J., Halekas, J., Eparvier, F., Larson, D., Connerney, J., Jakosky, B.

“…In the absence of an intrinsic dipole magnetic field, Mars' O+ planetary ions are accelerated by the solar wind. Because of their large gyroradius, a…”
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New Solar Extreme-ultraviolet Irradiance Observations during Flares by Woods, Thomas N, Hock, Rachel, Eparvier, Frank, Jones, Andrew R, Chamberlin, Phillip C, Klimchuk, James A, Didkovsky, Leonid, Judge, Darrell, Mariska, John, Warren, Harry, Schrijver, Carolus J, Webb, David F, Bailey, Scott, Tobiska, W. Kent

“…New solar extreme-ultraviolet (EUV) irradiance observations from the NASA Solar Dynamics Observatory (SDO) EUV Variability Experiment provide full coverage in…”
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Ionospheric model-observation comparisons: E layer at Arecibo Incorporation of SDO-EVE solar irradiances by Sojka, Jan J., Jensen, Joseph B., David, Michael, Schunk, Robert W., Woods, Tom, Eparvier, Frank, Sulzer, Michael P., Gonzalez, Sixto A., Eccles, J. Vincent

“…This study evaluates how the new irradiance observations from the NASA Solar Dynamics Observatory (SDO) Extreme Ultraviolet Variability Experiment (EVE) can,…”
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NEW SOLAR EXTREME-ULTRAVIOLET IRRADIANCE OBSERVATIONS DURING FLARES by Woods, Thomas N., Hock, Rachel, Eparvier, Frank, Jones, Andrew R., Chamberlin, Phillip C., Klimchuk, James A., Didkovsky, Leonid, Judge, Darrell, Mariska, John, Warren, Harry, Schrijver, Carolus J., Webb, David F., Bailey, Scott, Tobiska, W. Kent

“…New solar extreme-ultraviolet (EUV) irradiance observations from the NASA Solar Dynamics Observatory (SDO) EUV Variability Experiment provide full coverage in…”
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Solar Analogs as a Tool to Understand the Sun by Youngblood, Allison, Cranmer, Steve, Van Kooten, Sam, Mason, James Paul, Pineda, J. Sebastian, France, Kevin, Vorobiev, Dmitry, Eparvier, Frank, Notsu, Yuta

“…Solar analogs, broadly defined as stars similar to the Sun in mass or spectral type, provide a useful laboratory for exploring the range of Sun-like behaviors…”
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