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3. Space science

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  1. Content type: Letter

    Solar activity of cycle 24 following the deep minimum between cycle 23 and cycle 24 is the weakest one since cycle 14 (1902–1913). Geomagnetic activity is also low in cycle 24. We show that this low geomagneti...

    Authors: Shinichi Watari

    Citation: Earth, Planets and Space 2017 69:70

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  2. Content type: Letter

    Monitoring, tracking and nowcasting of the ionospheric plasma density disturbances using dual-frequency measurements of the Global Positioning System (GPS) signals are effectively carried out during several de...

    Authors: Iurii Cherniak and Irina Zakharenkova

    Citation: Earth, Planets and Space 2017 69:66

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  3. Content type: Full paper

    In this paper, we present a statistical and case analysis of nighttime Pc3 pulsations observed from middle to equatorial latitudes during the year 2003. We found two groups of nighttime Pc3 pulsations. Pc3s of...

    Authors: Nadezda V. Yagova, Balazs Heilig, Vyacheslav A. Pilipenko, Akimasa Yoshikawa, Nataliya S. Nosikova, Kiyohumi Yumoto and Jan Reda

    Citation: Earth, Planets and Space 2017 69:61

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  4. Content type: Full paper

    The breakup of Hitomi (ASTRO-H) on 26 March 2016 is analysed. Debris from the fragmentation is used to estimate the time of the event by propagating backwards and estimating the close approach with the parent ...

    Authors: Sven Flegel, James Bennett, Michael Lachut, Marek Möckel and Craig Smith

    Citation: Earth, Planets and Space 2017 69:51

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  5. Content type: Full paper

    We studied the Aa geomagnetic index (aa index daily average) behavior on a monthly timescale using data from 1868 to 2015 for cycles 11–24. We identified solar- and lunar-associated periodicities in the Aa time s...

    Authors: Blanca Mendoza, Marni Pazos and Luis Xavier González

    Citation: Earth, Planets and Space 2016 68:200

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  6. Content type: Full paper

    The astronomical diaries from Babylonia (ADB) are excellent sources of information of natural phenomena, including astronomical ones, in pre-Christ era because it contains the record of highly continuous and s...

    Authors: Hisashi Hayakawa, Yasuyuki Mitsuma, Yusuke Ebihara, Akito Davis Kawamura, Hiroko Miyahara, Harufumi Tamazawa and Hiroaki Isobe

    Citation: Earth, Planets and Space 2016 68:195

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  7. Content type: Letter

    We carry out a self-consistent simulation of the generation process of whistler-mode chorus by a spatially one-dimensional electron hybrid code, by assuming the magnetic field inhomogeneity corresponding to L = 4...

    Authors: Yuto Katoh and Yoshiharu Omura

    Citation: Earth, Planets and Space 2016 68:192

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  8. Content type: Technical report

    E-science on the Web plays an important role and offers the most advanced technology for the integration of data systems. It also makes available data for the research of more and more complex aspects of the ...

    Authors: Bernd Ritschel, Friederike Borchert, Gregor Kneitschel, Günther Neher, Susanne Schildbach, Toshihiko Iyemori, Yukinobu Koyama, Akiyo Yatagai, Tomoaki Hori, Mike Hapgood, Anna Belehaki, Ivan Galkin and Todd King

    Citation: Earth, Planets and Space 2016 68:181

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  9. Content type: Full paper

    The objective of this study is (1) to determine the magnetic cloud (MC) structure associated with the 17 March 2015 storm and (2) to gain an insight into how the storm developed responding to the solar wind co...

    Authors: Katsuhide Marubashi, Kyung-Suk Cho, Rok-Soon Kim, Sujin Kim, Sung-Hong Park and Hiromitsu Ishibashi

    Citation: Earth, Planets and Space 2016 68:173

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  10. Content type: Full paper

    Recent imager and radar observations in the nightside polar cap have shown evidence that polar cap patches are associated with localized flow channels. To understand how flow channels propagate from the daysi...

    Authors: Boyi Wang, Yukitoshi Nishimura, Larry R. Lyons, Ying Zou, Herbert C. Carlson, Harald U. Frey and Stephen B. Mende

    Citation: Earth, Planets and Space 2016 68:150

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  11. Content type: Full paper

    The first super geomagnetic storm (Dst < −200 nT) of solar cycle 24 occurred on “St. Patrick’s day” (17 March 2015). Notably, it was a two-step storm. The source of the storm can be traced back to the solar ev...

    Authors: Chin-Chun Wu, Kan Liou, Ronald P. Lepping, Lynn Hutting, Simon Plunkett, Russ A. Howard and Dennis Socker

    Citation: Earth, Planets and Space 2016 68:151

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  12. Content type: Full paper

    We investigated evolution of ionospheric currents during sudden commencements using a ground magnetometer network in conjunction with an all-sky imager, which has the advantage of locating field-aligned curren...

    Authors: Yukitoshi Nishimura, Takashi Kikuchi, Yusuke Ebihara, Akimasa Yoshikawa, Shun Imajo, Wen Li and Hisashi Utada

    Citation: Earth, Planets and Space 2016 68:144

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  13. Content type: Full paper

    To clarify the effect of the dawn and dusk terminators on Pi2 pulsations, we statistically analyzed the longitudinal phase and amplitude structures of Pi2 pulsations at middle- to low-latitude stations (GMLat...

    Authors: Shun Imajo, Akimasa Yoshikawa, Teiji Uozumi, Shinichi Ohtani, Aoi Nakamizo, Sodnomsambuu Demberel and Boris Mikhailovich Shevtsov

    Citation: Earth, Planets and Space 2016 68:137

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  14. Content type: Letter

    We present an analysis of ionospheric irregularities at high latitudes during the 2015 St. Patrick’s Day storm. Our study used measurements from ~2700 ground-based GPS stations and GPS receivers onboard five l...

    Authors: Iurii Cherniak and Irina Zakharenkova

    Citation: Earth, Planets and Space 2016 68:136

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  15. Content type: Letter

    Here we study the global distribution of the plasma density irregularities in the topside ionosphere by using the concurrent GPS and Langmuir probe measurements onboard the Swarm satellites. We analyze 18 mont...

    Authors: Irina Zakharenkova, Elvira Astafyeva and Iurii Cherniak

    Citation: Earth, Planets and Space 2016 68:120

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  16. Content type: Full paper

    The aim of this work is to study the properties of the magnetic field’s fluctuations produced by ionospheric and magnetospheric electric currents during the St. Patrick’s Day geomagnetic storm (17 March 2015)....

    Authors: Paola De Michelis, Giuseppe Consolini, Roberta Tozzi and Maria Federica Marcucci

    Citation: Earth, Planets and Space 2016 68:105

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  17. Content type: Full paper

    The electric field instruments onboard the Swarm satellites make high-resolution measurements of the F-region ion drift. This paper presents an initial investigation of preliminary ion drift data made availabl...

    Authors: R. A. D. Fiori, A. V. Koustov, D. H. Boteler, D. J. Knudsen and J. K. Burchill

    Citation: Earth, Planets and Space 2016 68:100

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  18. Content type: Full paper

    Preliminary Swarm Langmuir probe measurements recorded during March 2015, a period of time including the St. Patrick storm, are considered. Specifically, six time periods are identified: two quiet periods befo...

    Authors: Alessio Pignalberi, Michael Pezzopane, Roberta Tozzi, Paola De Michelis and Igino Coco

    Citation: Earth, Planets and Space 2016 68:93

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  19. Content type: Technical report

    Multipoint observations of plasma waves are essential for separating spatial and temporal variations of a plasma turbulence. Miniaturization and high environmental (temperature and radiation) robustness are k...

    Authors: Mitsunori Ozaki, Satoshi Yagitani, Hirotsugu Kojima, Ken Takahashi, Hiroki Koji, Takahiro Zushi and Yuya Tokunaga

    Citation: Earth, Planets and Space 2016 68:91

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  20. Content type: Full paper

    The 3D instability of spontaneous fast magnetic reconnection process is studied with magnetohydrodynamic simulations, where 2D model of the spontaneous fast magnetic reconnection process is destabilized in thr...

    Authors: Tohru Shimizu, Hiroyuki Torii and Koji Kondoh

    Citation: Earth, Planets and Space 2016 68:89

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  21. Content type: Full paper

    A relatively new method based on measurements by multipoint continuous Doppler sounding is applied to study the occurrence rate, propagation velocities, and directions of spread F structures over Tucumán, Nor...

    Authors: Jaroslav Chum, Jann-Yenq Liu, Shih-Ping Chen, Miguel Angel Cabrera, Jan Laštovička, Jiří Baše, Dalia Burešová, Jiří Fišer, František Hruška and Rodolfo Ezquer

    Citation: Earth, Planets and Space 2016 68:56

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  22. Content type: Full paper

    In this study, we develop a three-dimensional ionospheric tomography with the ground-based global position system (GPS) total electron content observations. Because of the geometric limitation of GPS observati...

    Authors: C. H. Chen, A. Saito, C. H. Lin, M. Yamamoto, S. Suzuki and G. K. Seemala

    Citation: Earth, Planets and Space 2016 68:32

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    The Erratum to this article has been published in Earth, Planets and Space 2016 68:122

  23. Content type: Letter

    In this study, we constructed an empirical model of the equatorial electrojet (EEJ), including local time and longitudinal dependence, based on simultaneous data from 12 magnetometer stations located in six lo...

    Authors: Nurul Shazana Abdul Hamid, Huixin Liu, Teiji Uozumi and Akimasa Yoshikawa

    Citation: Earth, Planets and Space 2015 67:205

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  24. Content type: Frontier letter

    A statistical study using a large dataset of Super Dual Auroral Radar Network (SuperDARN) observations is conducted for transient ionospheric plasma flows associated with sudden impulses (SI) recorded on groun...

    Authors: Tomoaki Hori, Atsuki Shinbori, Shigeru Fujita and Nozomu Nishitani

    Citation: Earth, Planets and Space 2015 67:190

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  25. Content type: Full paper

    We present three eastward-expanding auroral surge (EEAS) events that were observed intermittently at intervals of about 15 min in the post-midnight sector (01:55–02:40 MLT) by all-sky imagers and magnetometers...

    Authors: Yoshimasa Tanaka, Yasunobu Ogawa, Akira Kadokura, Noora Partamies, Daniel Whiter, Carl-Fredrik Enell, Urban Brändström, Tima Sergienko, Björn Gustavsson, Alexander Kozlovsky, Hiroshi Miyaoka and Akimasa Yoshikawa

    Citation: Earth, Planets and Space 2015 67:182

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  26. Content type: Full paper

    This paper (the second of a series) presents the results of statistical investigation of relationship between the interplanetary electric field E KL and the Polar Cap (PC) index in case of...

    Authors: OA Troshichev and DA Sormakov

    Citation: Earth, Planets and Space 2015 67:170

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  27. Content type: Letter

    Accurate mapping of the auroral oval into the equatorial plane is critical for the analysis of aurora and substorm dynamics. Comparison of ion pressure values measured at low altitudes by Defense Meteorologica...

    Authors: E. E. Antonova, V. G. Vorobjev, I. P. Kirpichev, O. I. Yagodkina and M. V. Stepanova

    Citation: Earth, Planets and Space 2015 67:166

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    The Erratum to this article has been published in Earth, Planets and Space 2015 67:188

  28. Content type: FULL PAPER

    Substorm triggering was the focus of recent two-dimensional superposed-epoch analyses based on Geotail and THEMIS data. The results indicate that magnetic-field dipolarization at X∼−8 Re and magnetic reconnection...

    Authors: Hirotoshi Uchino and Shinobu Machida

    Citation: Earth, Planets and Space 2015 67:165

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  29. Content type: Full paper

    A nonlinear optimization algorithm coupled with a model of auroral current systems allows derivation of physical parameters from data and is the basis of a new inversion technique. We refer to this technique a...

    Authors: Martin Connors and Gordon Rostoker

    Citation: Earth, Planets and Space 2015 67:155

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  30. Content type: Letter

    The magnetosphere substorm plays a crucial role in the solar wind energy dissipation into the ionosphere. We report on the intensity of the high-latitude ionospheric irregularities during one of the largest st...

    Authors: Iurii Cherniak and Irina Zakharenkova

    Citation: Earth, Planets and Space 2015 67:151

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  31. Content type: LETTER

    This paper presents the first results of statistical analysis of 2-year data series obtained with the first midlatitude decameter coherent radar of Russian segment of SuperDARN network. Based on individual eve...

    Authors: Oleg I. Berngardt, Nina A. Zolotukhina and Alexey V. Oinats

    Citation: Earth, Planets and Space 2015 67:143

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  32. Content type: FULL PAPER

    Substorm initiation still remains an unsolved problem, even though there is a consensus among most researchers that its main stages include dayside reconnection and substorm expansion. Dayside reconnection res...

    Authors: M. Kubyshkina, N. Tsyganenko, V. Semenov, D. Kubyshkina, N. Partamies and E. Gordeev

    Citation: Earth, Planets and Space 2015 67:139

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  33. Content type: Letter

    Recently, it was argued that Hall conductivity and peak intensity of equivalent ionospheric currents are sensitive to the amount of field-aligned acceleration of plasma sheet (PS) electrons, which in turn depe...

    Authors: V A Sergeev, N P Dmitrieva, N A Stepanov, D A Sormakov, V Angelopoulos and A V Runov

    Citation: Earth, Planets and Space 2015 67:133

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  34. Content type: LETTER

    This paper provides insights into the possible coupling between reconnection and interchange/ballooning in the magnetotail related to substorms and flow bursts. The results presented are largely based on recen...

    Authors: Joachim Birn, Yi-Hsin Liu, William Daughton, Michael Hesse and Karl Schindler

    Citation: Earth, Planets and Space 2015 67:110

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  35. Content type: Full paper

    We present a comparative study of high-intensity long-duration continuous AE activity (HILDCAA) events, both isolated and those occurring in the “recovery phase” of geomagnetic storms induced by corotating int...

    Authors: Rajkumar Hajra, Bruce T Tsurutani, Ezequiel Echer, Walter D Gonzalez, Christiano Garnett Marques Brum, Luis Eduardo Antunes Vieira and Ondrej Santolik

    Citation: Earth, Planets and Space 2015 67:109

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  36. Content type: Full paper

    It is important to study the ‘concentrated’ electrostatic solitary waves/structures (ESWs) associated with the magnetic reconnection. In the literature published as regards this topic, very few studies have re...

    Authors: Shiyou Li, Shifeng Zhang, Hong Cai and Sufang Yu

    Citation: Earth, Planets and Space 2014 66:161

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  37. Content type: Full paper

    We investigate the aspect angle sensitivity of the pump-induced artificial optical emissions in the ionosphere over the European Incoherent Scatter Scientific Association (EISCAT) high-frequency transmitter fa...

    Authors: Michael J Kosch, Carl Bryers, Michael T Rietveld, Timothy K Yeoman and Yasunobu Ogawa

    Citation: Earth, Planets and Space 2014 66:159

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  38. Content type: Frontier letter

    We derived the coronal magnetic field, plasma density, and temperature from the observation of polarization and intensity of radio thermal free-free emission using the Nobeyama Radioheliograph (NoRH) and extre...

    Authors: Kazumasa Iwai, Kiyoto Shibasaki, Satoshi Nozawa, Takuya Takahashi, Shinpei Sawada, Jun Kitagawa, Shun Miyawaki and Hirotaka Kashiwagi

    Citation: Earth, Planets and Space 2014 66:149

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  39. Content type: FULL PAPER

    We investigate possible generation mechanisms of Pc1 pearl structures using multi-point induction magnetometers in Athabasca in Canada, Magadan in Russia, and Moshiri in Japan. We selected two Pc1 pulsations t...

    Authors: Chae-Woo Jun, Kazuo Shiokawa, Martin Connors, Ian Schofield, Igor Poddelsky and Boris Shevtsov

    Citation: Earth, Planets and Space 2014 66:140

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  40. Content type: Technical report

    The Interuniversity Upper atmosphere Global Observation NETwork (IUGONET) project is a 6-year research project which started in 2009. The objective of this project is to establish a metadata database of variou...

    Authors: Shuji Abe, Norio Umemura, Yukinobu Koyama, Yoshimasa Tanaka, Manabu Yagi, Akiyo Yatagai, Atsuki Shinbori, Satoru UeNo, Yuka Sato and Naoki Kaneda

    Citation: Earth, Planets and Space 2014 66:133

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  41. Content type: Letter

    We plan to observe solar neutrons at Mt. Sierra Negra (4,600 m above sea level) in Mexico using the SciBar detector. This project is named the SciBar Cosmic Ray Telescope (SciCRT). The main aims of the SciCRT ...

    Authors: Yoshinori Sasai, Yuya Nagai, Yoshitaka Itow, Yutaka Matsubara, Takashi Sako, Diego Lopez, Tsukasa Itow, Kazuoki Munakata, Chihiro Kato, Masayoshi Kozai, Takahiro Miyazaki, Shoichi Shibata, Akitoshi Oshima, Hiroshi Kojima, Harufumi Tsuchiya, Kyoko Watanabe…

    Citation: Earth, Planets and Space 2014 66:130

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  42. Content type: Full paper

    This paper describes a neural network-based model developed to predict geomagnetic storms time K index as measured at a magnetic observatory located in Hermanus (34°25 S; 19°13 E), South Africa. The parameters us...

    Authors: Jean Uwamahoro and John Bosco Habarulema

    Citation: Earth, Planets and Space 2014 66:95

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